1087 lines
45 KiB
C
1087 lines
45 KiB
C
/** @file */
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// xos_thread.h - XOS Thread API interface and data structures.
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// Copyright (c) 2003-2015 Cadence Design Systems, Inc.
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be included
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// in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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// NOTE: Do not include this file directly in your application. Including
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// xos.h will automatically include this file.
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#ifndef __XOS_THREAD_H__
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#define __XOS_THREAD_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "xos_types.h"
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#include "xos_params.h"
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//-----------------------------------------------------------------------------
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// Number of thread priority levels.
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//-----------------------------------------------------------------------------
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#ifndef XOS_NUM_PRIORITY
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#error "XOS_NUM_PRIORITY must be defined (in xos_params.h)."
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#endif
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#if XOS_NUM_PRIORITY > 32
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#error "The number of thread priority levels (XOS_NUM_PRIORITY) must be <= 32."
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#endif
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#define XOS_MAX_PRIORITY (XOS_NUM_PRIORITY)
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//-----------------------------------------------------------------------------
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// Macro for thread self pointer.
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//-----------------------------------------------------------------------------
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#define XOS_THREAD_SELF (xos_thread_id())
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//-----------------------------------------------------------------------------
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///
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/// Thread entry function pointer type.
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///
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//-----------------------------------------------------------------------------
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typedef int32_t (XosThreadFunc)(void * arg, int32_t wake_value);
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//-----------------------------------------------------------------------------
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// Thread switcher function signature.
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//-----------------------------------------------------------------------------
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typedef struct XosThread XosThread;
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typedef int32_t (XosSwitchFunc)(XosThread *);
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//-----------------------------------------------------------------------------
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///
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/// Condition evaluation callback function pointer type.
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///
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//-----------------------------------------------------------------------------
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typedef int32_t (XosCondFunc)(void * arg, int32_t sig_value, XosThread * thread);
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//-----------------------------------------------------------------------------
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///
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/// Thread exit handler function pointer type.
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///
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//-----------------------------------------------------------------------------
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typedef int32_t (XosThdExitFunc)(int32_t exitcode);
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//-----------------------------------------------------------------------------
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// Thread queue structure. Used to implement the ready queues as well
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// as the wait queues.
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//-----------------------------------------------------------------------------
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typedef struct XosThreadQueue {
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XosThread * head; // Pointer to first thread in queue, or 0 if none.
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XosThread ** tail; // Pointer to last thread's r_next pointer, or
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// to "head" if none.
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} XosThreadQueue;
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//-----------------------------------------------------------------------------
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// Stack frame for a thread that is not running. That is, it has either
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// been preempted or has yielded.
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//-----------------------------------------------------------------------------
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typedef union XosFrame {
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XosExcFrame e; // resume_fn == &xos_resume_preempted_thread
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XosCoopFrame c; // resume_fn == &xos_resume_cooperative_thread
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// nothing for resume_fn == &xos_resume_idle_thread
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// nothing for resume_fn == &xos_resume_by_restart
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} XosFrame;
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//-----------------------------------------------------------------------------
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// Thread Control Block. Tracks the state and control information associated
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// with a thread.
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//
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// IMPORTANT: keep this in sync with TCB_*** offsets in xos_common.h .
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//-----------------------------------------------------------------------------
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struct XosThread {
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XosThread * r_next; // 00 Next thread in queue (eg. ready queue of
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// its priority, or some queue of blocked threads)
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// Should be NULL if not in any queue.
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XosThread ** r_pprev; // 04 Points to previous queue entry's r_next
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// pointer (i.e. to itself), or to queue head
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// if first in queue. NULL if not in any queue.
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XosThread * all_next; // 08 Next in list of all threads.
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void * resume_fn; // 12 Pointer to the routine to be called to
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// resume this thread. On entry to such code:
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// a2 == xos_curr_threadptr (thread being resumed)
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// a3 == &xos_globals
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XosFrame * esf; // 16 Pointer to saved exception stack frame,
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// just below thread's current stack pointer.
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// For RTC threads, this is valid only while the
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// thread is preempted, not when it is blocked.
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void * tie_save; // 20 TIE state save area. May be NULL if there
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// is not TIE state saved for this thread.
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int32_t wake_value; // 24 Value returned from block call (by wake call)
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// (for RTC: pass this to start function??)
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XosSwitchFunc * switch_fn; // 28 Pointer to a function that
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// can be called from within this thread, to save
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// this thread's state and switch to a specified
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// other thread. Returns wake value.
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void * stack_base; // 32 Base of stack as specified by thread creator.
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void * stack_end; // 36 End of stack (adjusted for TIE state save area
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// if any).
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XosThreadFunc * entry; // 40 Pointer to thread entry function. Used for
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// RTC thread restart.
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void * arg; // 44 Argument value passed to entry function.
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bool ready; // 48 Set when thread is ready to run, and is in
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// its priority queue (i.e. r_pprev is set when
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// this flag is set).
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bool in_exit; // Exit flag, nonzero when in exit processing.
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int8_t priority; // Thread priority, 0 .. (XOS_MAX_PRI - 1). Higher
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// numbers have higher priority. This must only be
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// changed when thread is not ready, or by calling
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// xos_thread_set_priority().
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int8_t preempt_pri; // This thread's preemption blocking priority.
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// (preempt_pri >= priority). A thread's priority
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// must be higher than another's preempt_pri to be
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// able to preempt it. Note that preempt_pri can
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// change during runtime e.g. due to priority
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// inheritance.
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uint32_t flags; // 52 Thread creation flags.
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const char * name; // 56 Thread name (mainly for debug).
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const char * block_cause; // 60 Reason for blocking. Valid only when thread
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// not ready (r_pprev == 0).
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XosThread * container; // 64 Thread whose stack will be used to run
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// this thread. Valid for RTC threads only, else NULL.
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XosThdExitFunc * exit_func; // 68 Thread exit handler function pointer.
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XosThreadQueue exit_waiters; // 72 Queue of threads waiting for this one to exit.
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XosThreadQueue * wq_ptr; // 80 If this thread is in a wait queue, this
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// points to the queue. Must be NULL when
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// thread not in a queue.
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XosCondFunc * cond_fn; // 84 Condition function. Valid only while thread
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// is blocked on condition.
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void * cond_arg; // 88 Argument to be passed to condition function.
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uint16_t cp_mask; // 92 Mask of coprocessors used.
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uint16_t cp_saved; // 94 Mask of coprocessors saved.
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uint32_t event_bits; // 96 event bits
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uint32_t event_mask; // 100 event bit mask
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uint32_t event_flags; // 104 event flags
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void * clib_ptr; // 108 Pointer to C lib context struct.
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uint32_t sig; // 112 Signature of valid TCB
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uint32_t resume_ccount; // 116 cycle count at resume
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uint64_t cycle_count; // 120 number of cycles consumed (approx).
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// NOTE: must be 8-byte aligned
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uint32_t normal_resumes; // 128 Number of non-preemptive resumptions.
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uint32_t preempt_resumes;// 132 Number of preemptive resumptions.
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#if XOS_OPT_THREAD_SAFE_CLIB
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CLIB_THREAD_STRUCT; // C library context area.
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#endif
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};
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//-----------------------------------------------------------------------------
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// User-visible flags for xos_thread_create().
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//-----------------------------------------------------------------------------
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#define XOS_THREAD_SUSPEND 0x0001 ///< Create suspended instead of ready
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#define XOS_THREAD_RTC 0x0002 ///< Run-to-completion thread
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#define XOS_THREAD_NO_CP 0x0004 ///< Thread does not use coprocessors
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//-----------------------------------------------------------------------------
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// Flags used by thread creation extra parameters.
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//-----------------------------------------------------------------------------
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#define XOS_TP_COPROC_MASK 0x0001
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#define XOS_TP_PREEMPT_PRI 0x0002
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#define XOS_TP_EXIT_HANDLER 0x0004
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//-----------------------------------------------------------------------------
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// Thread creation extra parameters.
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//-----------------------------------------------------------------------------
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typedef struct XosThreadParm {
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uint32_t parms_mask; // Combination of XOS_TP_xxx flags indicating
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// which parameters are valid.
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uint16_t cp_mask; // Mask of coprocessors the thread can access.
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uint32_t preempt_pri; // Initial preemption blocking priority. Can be
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// changed later via xos_thread_set_priority().
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XosThdExitFunc * handler; // Exit handler function.
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} XosThreadParm;
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//-----------------------------------------------------------------------------
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// Wrapper struct for RTC (run to completion) thread.
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//-----------------------------------------------------------------------------
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typedef struct XosRtcThread {
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struct XosThread thread;
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} XosRtcThread;
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//-----------------------------------------------------------------------------
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// External variables.
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//-----------------------------------------------------------------------------
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extern XosThread * xos_curr_threadptr; // Current active thread
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extern XosThread * xos_next_threadptr; // Next ready thread
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extern XosThread * xos_all_threads; // List of all threads
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//-----------------------------------------------------------------------------
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///
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/// Set thread creation parameter: the group of coprocessors that this thread
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/// will use. This must be set during thread creation, and cannot be changed
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/// after the thread has been created. Defining this allows reduction of
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/// memory usage (for CP state saving) in some circumstances, and can also
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/// speed up the context switch time.
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///
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/// NOTE: Support for this is not currently implemented. If a thread uses
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/// any coprocessor, space for all coprocessors must be reserved.
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///
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/// \param parms Thread creation parameter structure. Must be
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/// allocated by the caller.
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///
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/// \param cp_mask Bitmask of coprocessors thread is allowed to
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/// use. Bit 0 for coprocessor 0, etc.
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///
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/// \return Returns nothing.
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///
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//-----------------------------------------------------------------------------
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static inline void
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xos_threadp_set_cp_mask(XosThreadParm * parms, uint16_t cp_mask)
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{
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if (parms != XOS_NULL) {
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parms->parms_mask |= XOS_TP_COPROC_MASK;
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parms->cp_mask = cp_mask;
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}
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}
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//-----------------------------------------------------------------------------
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///
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/// Set thread creation parameter: thread pre-emption priority.
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///
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/// \param parms Thread creation parameter structure. Must be
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/// allocated by caller.
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///
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/// \param preempt_pri Thread pre-emption blocking priority.
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/// From 0 .. XOS_NUM_PRIORITY - 1.
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/// Must be greater or equal to the thread priority
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/// (if not, is automatically set to thread priority).
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///
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/// \return Returns nothing.
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///
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//-----------------------------------------------------------------------------
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static inline void
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xos_threadp_set_preemption_priority(XosThreadParm * parms, int8_t preempt_pri)
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{
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if (parms != XOS_NULL) {
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parms->parms_mask |= XOS_TP_PREEMPT_PRI;
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parms->preempt_pri = preempt_pri;
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}
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}
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//-----------------------------------------------------------------------------
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///
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/// Set thread creation parameter: thread exit handler.
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///
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/// \param parms Thread creation parameter structure. Must be
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/// allocated by caller.
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///
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/// \param handler Exit handler function.
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///
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/// \return Returns nothing.
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//-----------------------------------------------------------------------------
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static inline void
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xos_threadp_set_exit_handler(XosThreadParm * parms, XosThdExitFunc * handler)
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{
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if (parms != XOS_NULL) {
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parms->parms_mask |= XOS_TP_EXIT_HANDLER;
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parms->handler = handler;
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}
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}
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//-----------------------------------------------------------------------------
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///
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/// Create a new thread. If the thread is not created suspended, then it will
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/// be made ready as soon as it is created, and will immediately run if it is
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/// the highest priority non-blocked thread in the system.
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///
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/// \param thread Pointer to the thread descriptor (an otherwise
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/// unused XosThread structure, usually allocated
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/// by the caller for the lifetime of the thread,
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/// for example as a global variable).
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///
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/// \param container Pointer to separate thread acting as "container"
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/// for this one. At the moment, this is only meaningful
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/// for run-to-completion (RTC) threads (identified with
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/// the XOS_THREAD_RTC flag), in which case the container
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/// must have the same priority and also be an RTC thread.
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/// (The priority restriction may be lifted in a future
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/// implementation, with appropriate constraints on dynamic
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/// reprioritization of the created thread).
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///
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/// \param entry Thread entry function, takes one argument.
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///
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/// \param arg Argument "void*" that is passed to the thread function.
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///
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/// \param name Unique name of the thread, for debug/display purposes.
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/// This string must be valid for the lifetime of the thread
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/// (only a pointer to it is stored in the thread control block).
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/// Typically consists of identifier chars with no spaces.
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///
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/// \param stack Base of initial stack for the thread, allocated by the
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/// caller. Need not be aligned (initial stack pointer will be
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/// computed and aligned from given stack base and size).
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/// Required argument, except for run-to-completion threads
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/// when container is non-NULL, in which case the container's
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/// stack is used and this argument must be NULL.
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///
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/// \param stack_size Size of the stack, in bytes.
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/// NOTE: stack should be at least XOS_STACK_EXTRA bytes plus
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/// whatever the thread actually needs if the thread will use
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/// coprocessors/TIE state. If the thread will not touch the
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/// coprocessors, then it should be XOS_STACK_EXTRA_NO_CP
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/// plus whatever the thread actually needs.
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/// Recommended minimum stack sizes are defined by the constants
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/// XOS_STACK_MIN_SIZE and XOS_STACK_MIN_SIZE_NO_CP.
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///
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/// For run-to-completion threads where container is non-NULL,
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/// stack_size specifies the minimum stack size required for
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/// the thread; it should be smaller or equal to the container's
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/// stack.
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///
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/// \param priority Initial thread priority. From 0 .. XOS_MAX_PRI - 1.
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/// Higher numbers are higher priority.
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///
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/// \param parms Pointer to extra parameters structure, or 0 if none given.
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/// Use xos_thread_p_***() functions to set parameters in the
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/// structure.
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///
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/// \param flags Option flags:
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/// - XOS_THREAD_SUSPEND -- Leave thread suspended instead of
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/// making it ready. The thread can be made ready to run later
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/// by calling xos_thread_resume().
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/// - XOS_THREAD_RTC -- Run-to-completion thread.
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/// - XOS_THREAD_NO_CP -- Thread does not use coprocessors.
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/// No coprocessor state will be saved for this thread.
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/// Threads that have this flag set will not allocate any
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/// storage for saving coprocessor state and so can have
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/// smaller stacks.
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///
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/// NOTE: xos_start_main() calls xos_thread_create() to convert main() into the 'main'
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/// thread.
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///
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/// \return Returns XOS_OK if successful, error code otherwise.
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///
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//-----------------------------------------------------------------------------
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int32_t
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xos_thread_create(XosThread * thread,
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XosThread * container,
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XosThreadFunc * entry,
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void * arg,
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const char * name,
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void * stack,
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uint32_t stack_size,
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int32_t priority,
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XosThreadParm * parms,
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uint32_t flags );
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//-----------------------------------------------------------------------------
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///
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/// Remove thread and free up all resources. Thread must have exited already.
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/// After this call returns, all resources allocated to the thread (e.g. TCB,
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/// stack space, etc.) can be reused.
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///
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/// \param thread Handle of thread to be deleted.
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///
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/// \return Returns XOS_OK on success, else error code.
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///
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/// NOTE: A thread cannot call this on itself.
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///
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//-----------------------------------------------------------------------------
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int32_t
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xos_thread_delete(XosThread * thread);
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//-----------------------------------------------------------------------------
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///
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/// Force the thread to terminate. The thread execution is aborted, but exit
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/// processing will still happen, i.e. the exit handler (if any) will be run.
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/// After termination, any other threads waiting on this thread are notified.
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/// This function cannot be called on the current thread.
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///
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/// \param thread Handle of thread to be aborted.
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///
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/// \param exitcode Exit code returned to any waiting threads.
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///
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/// \return Returns XOS_OK on success, else error code.
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///
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/// NOTE: If the thread is blocked waiting for something, the wait is aborted
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/// and the thread is made ready.
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/// NOTE: The thread is not guaranteed to have exited when this call returns.
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/// It will be made ready and set up for exit processing, but when the exit
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/// processing will actually happen depends on the state of the system and
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/// the priority of the thread being aborted.
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///
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//-----------------------------------------------------------------------------
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int32_t
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xos_thread_abort(XosThread * thread, int32_t exitcode);
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//-----------------------------------------------------------------------------
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///
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/// Exit the current thread. The exit handler (if any) will be run before the
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/// thread terminates.
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///
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/// \param exitcode Exit code to be returned to any waiting threads.
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///
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/// \return This function does not return.
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///
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/// NOTE: This is automatically called if the thread returns from its entry
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/// function. The entry function's return value will be passed as the exit
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/// code.
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///
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//-----------------------------------------------------------------------------
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void
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xos_thread_exit(int32_t exitcode);
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//-----------------------------------------------------------------------------
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///
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/// Wait until the specified thread exits and get its exit code. If the thread
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/// has exited already, an error will be returned.
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///
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/// \param thread The thread to wait for. Cannot be "self", i.e.
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/// one cannot wait on one's own exit.
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///
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/// \param p_exitcode If not null, the exit code will be returned here.
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///
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/// \return Returns XOS_OK on sucess, else error code.
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///
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//-----------------------------------------------------------------------------
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int32_t
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xos_thread_join(XosThread * thread, int32_t * p_exitcode);
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//-----------------------------------------------------------------------------
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///
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/// Yield the CPU to the next thread in line. The calling thread remains ready
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/// and is placed at the tail of the ready queue at its current priority level.
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/// If there are no threads at the same priority level that are ready to run,
|
|
/// then this call will return immediately.
|
|
///
|
|
/// \return Returns nothing.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
void
|
|
xos_thread_yield();
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Suspend the specified thread. The thread will remain suspended until
|
|
/// xos_thread_resume() has been called on it. If the thread is already blocked
|
|
/// on some other condition, then this function will return an error.
|
|
///
|
|
/// \param thread Handle of thread being suspended. A thread can
|
|
/// use the special handle XOS_THREAD_SELF to suspend
|
|
/// itself.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_thread_suspend(XosThread * thread);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Resume a suspended thread. If the thread is not suspended or is blocked on
|
|
/// some other condition then this function will do nothing. Otherwise, it will
|
|
/// be made ready, and this can cause an immediate context switch if the thread
|
|
/// is at a higher priority than the calling thread.
|
|
///
|
|
/// \param thread Handle of thread being resumed.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_thread_resume(XosThread * thread);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Get the priority of the specified thread. This returns the priority of the
|
|
/// queried thread at this instant, however this can change at any time due to
|
|
/// other activity in the system.
|
|
///
|
|
/// \param thread Handle of thread being queried. A thread can use
|
|
/// the special handle XOS_THREAD_SELF to query itself.
|
|
///
|
|
/// \return Returns the thread's current priority, or -1 if the thread handle
|
|
/// is not valid.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline int32_t
|
|
xos_thread_get_priority(XosThread * thread)
|
|
{
|
|
XOS_ASSERT(thread);
|
|
return thread ? thread->priority : -1;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Set the priority of the specified thread. The thread must exist.
|
|
///
|
|
/// \param thread Handle of thread being affected. A thread can
|
|
/// use the special handle XOS_THREAD_SELF to specify
|
|
/// itself.
|
|
///
|
|
/// \param priority The new priority level to be set.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
/// NOTE: Calling this function can result in a scheduler activation, and the
|
|
/// caller may be suspended as a result.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_thread_set_priority(XosThread * thread, int32_t priority);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the name of the specified thread.
|
|
///
|
|
/// \param thread Handle of thread being queried. A thread can use
|
|
/// the special handle XOS_THREAD_SELF to specify
|
|
/// itself.
|
|
///
|
|
/// \return Returns a pointer to the name string if available, else NULL.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline const char *
|
|
xos_thread_get_name(XosThread * thread)
|
|
{
|
|
XOS_ASSERT(thread);
|
|
return thread ? thread->name : 0;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Set the name of the specified thread.
|
|
///
|
|
/// \param thread Handle of thread whose name is to be set. A thread
|
|
/// can use the special handle XOS_THREAD_SELF to specify
|
|
/// itself.
|
|
///
|
|
/// \param name Pointer to the new name string. The string is not
|
|
/// copied, only the pointer is saved. So the string
|
|
/// must be persistent for the life of the thread.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline int32_t
|
|
xos_thread_set_name(XosThread * thread, const char * name)
|
|
{
|
|
XOS_ASSERT(thread);
|
|
if (thread != XOS_NULL) {
|
|
thread->name = name;
|
|
return XOS_OK;
|
|
}
|
|
|
|
return XOS_ERR_INVALID_PARAMETER;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Set an exit handler for the specified thread. The exit handler is run when
|
|
/// the thread terminates, either by calling xos_thread_exit() or by returning
|
|
/// from its entry function. It will also be called if the thread is being
|
|
/// terminated due to e.g. an unhandled exception.
|
|
///
|
|
/// The handler must be a function defined as e.g.:
|
|
///
|
|
/// int32_t exit_handler(int32_t exitcode);
|
|
///
|
|
/// The exit handler runs in the context of the exiting thread, and can call
|
|
/// system services. It is provided with a single parameter which is the
|
|
/// thread's exit code (the exit code may be set to an error code if the
|
|
/// thread is being terminated due to an error or exception). The handler
|
|
/// must return a value which will be set as the thread's exit code.
|
|
///
|
|
/// \param thread Handle of the thread for which the handler is
|
|
/// to be installed. A thread can use the special
|
|
/// handle XOS_THREAD_SELF to specify itself.
|
|
///
|
|
/// \param func Pointer to exit handler function. To clear an
|
|
/// existing handler, pass NULL as the pointer.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_thread_set_exit_handler(XosThread * thread, XosThdExitFunc * func);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the ID (handle) of the current thread.
|
|
///
|
|
/// \return Returns the handle of the current thread. This handle can be
|
|
/// used in all XOS system calls.
|
|
///
|
|
/// NOTE: If called from interrupt context, returns the handle of the thread
|
|
/// that was preempted.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline XosThread *
|
|
xos_thread_id()
|
|
{
|
|
return xos_curr_threadptr;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the coprocessor mask for the specified thread.
|
|
///
|
|
/// \param thread Handle of thread being queried.
|
|
///
|
|
/// \return Returns the mask for the specified thread if available, else 0.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline uint16_t
|
|
xos_thread_cp_mask(XosThread * thread)
|
|
{
|
|
XOS_ASSERT(thread);
|
|
return thread ? thread->cp_mask : 0;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the wake value for the specified thread.
|
|
///
|
|
/// \return thread Handle of thread being queried.
|
|
///
|
|
/// \return Returns The last set wake value. There is no way to detect what
|
|
/// action set the wake value and when.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline int32_t
|
|
xos_thread_get_wake_value(XosThread * thread)
|
|
{
|
|
XOS_ASSERT(thread);
|
|
return thread ? thread->wake_value : 0;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the current value of the event bits for the current thread.
|
|
/// This function takes no parameters.
|
|
///
|
|
/// \return Returns the current value of the event bits. The event bits
|
|
/// are set when the thread is woken from an event wait. They will
|
|
/// not change while the thread is running. There is no way to
|
|
/// determine when the event bits were last updated.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
static inline uint32_t
|
|
xos_thread_get_event_bits(void)
|
|
{
|
|
XosThread * thread = xos_thread_id();
|
|
return thread ? thread->event_bits : 0;
|
|
}
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Enum values for thread state.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
typedef enum xos_thread_state_t {
|
|
XOS_THREAD_STATE_INVALID = 0, ///< Invalid thread
|
|
XOS_THREAD_STATE_BLOCKED, ///< Thread is blocked
|
|
XOS_THREAD_STATE_READY, ///< Thread is ready to run
|
|
XOS_THREAD_STATE_RUNNING, ///< Thread is running
|
|
XOS_THREAD_STATE_EXITED, ///< Thread has exited
|
|
} xos_thread_state_t;
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Return the state of the specified thread.
|
|
///
|
|
/// \param thread Handle of thread being queried.
|
|
///
|
|
/// \return Returns one of the following values:
|
|
/// - XOS_THREAD_STATE_RUNNING -- The thread is currently running.
|
|
/// - XOS_THREAD_STATE_READY -- The thread is ready to run.
|
|
/// - XOS_THREAD_STATE_BLOCKED -- The thread is blocked on something.
|
|
/// - XOS_THREAD_STATE_INVALID -- The thread handle is invalid.
|
|
/// - XOS_THREAD_STATE_EXITED -- The thread has exited.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
xos_thread_state_t
|
|
xos_thread_get_state(XosThread * thread);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Disable thread preemption. Prevents context switching to another thread.
|
|
/// However, interrupt handlers will still continue to be run. Multiple calls
|
|
/// will nest, and the same number of calls to xos_preemption_enable() will be
|
|
/// required to re-enable preemption. If the calling thread yields the CPU or
|
|
/// exits without enabling preemption, it will cause a system halt.
|
|
/// If the calling thread encounters a fatal error, preemption will be enabled
|
|
/// during fatal error handling.
|
|
///
|
|
/// \return Returns the new value of preemption disable flag after this call.
|
|
///
|
|
/// NOTE: Cannot be called from interrupt context.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
uint32_t
|
|
xos_preemption_disable(void);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Enable thread preemption. Has no effect if preemption was already enabled.
|
|
/// Otherwise, it decrements the value of the preemption disable flag and if
|
|
/// the value goes to zero, enables preemption.
|
|
///
|
|
/// \return Returns the new value of preemption disable flag after this call.
|
|
///
|
|
/// NOTE: If scheduling gets enabled, it may cause an immediate context switch
|
|
/// if higher priority threads are ready.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
uint32_t
|
|
xos_preemption_enable(void);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Initialize XOS thread support and start scheduler.
|
|
///
|
|
/// Must be called from main() before calling any other thread function.
|
|
/// This function initializes thread support, creates the idle thread, and
|
|
/// starts the scheduler. It does not return to its caller. This means that
|
|
/// at least one user thread must be created before calling xos_start().
|
|
/// Otherwise, the scheduler will run the idle thread since it will be the
|
|
/// only thread in the system, and no other thread can be created.
|
|
///
|
|
/// NOTE: This function does not initialize timer/tick support. For timer
|
|
/// services to be available xos_start_system_timer() must be called.
|
|
///
|
|
/// NOTE: xos_start() and xos_start_main() are exclusive, both cannot be
|
|
/// called within the same application.
|
|
///
|
|
/// \param flags Currently unused (pass 0).
|
|
///
|
|
/// \return Does not return.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
void
|
|
xos_start(uint32_t flags);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Initialize XOS thread support and create init (main) thread.
|
|
///
|
|
/// Must be called from main() before calling any other thread function.
|
|
/// This function converts the caller into the 'main' or 'init' thread, and
|
|
/// returns to the caller after completing initialization.
|
|
///
|
|
/// NOTE: This function does not initialize timer/tick support. For timer
|
|
/// services to be available xos_start_system_timer() must be called.
|
|
///
|
|
/// NOTE: xos_start_main() and xos_start() are exclusive, both cannot be
|
|
/// called within the same application.
|
|
///
|
|
/// \param name Name of main thread (see xos_thread_create()).
|
|
///
|
|
/// \param priority Initial priority of main thread.
|
|
///
|
|
/// \param flags Currently unused (pass 0).
|
|
///
|
|
/// \return Returns nothing.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
void
|
|
xos_start_main(const char * name, int8_t priority, uint32_t flags);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Per-thread stats structure.
|
|
/// Note that the CPU use % is approximate, both because of cycle counting
|
|
/// and because of integer division. So all the threads' CPU % will not add
|
|
/// up to exactly 100%.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
typedef struct XosThreadStats {
|
|
XosThread * thread; ///< Thread handle (or pseudo-handle)
|
|
uint32_t cpu_pct; ///< CPU use % for this thread
|
|
uint32_t normal_switches; ///< Number of non-preemptive switches.
|
|
uint32_t preempt_switches; ///< Number of preemptive switches.
|
|
uint64_t cycle_count; ///< Number of cycles consumed.
|
|
} XosThreadStats;
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Thread pseudo-handles.
|
|
//-----------------------------------------------------------------------------
|
|
#define XOS_THD_STATS_IDLE ((XosThread *) 1)
|
|
#define XOS_THD_STATS_INTR ((XosThread *) 2)
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Get the thread statistics for the specified thread. Statistics are only
|
|
/// available if XOS_OPT_STATS has been enabled. Otherwise, the function
|
|
/// will return XOS_OK, but the structure contents will be undefined.
|
|
///
|
|
/// \param thread Handle of thread being queried. The following
|
|
/// special pseudo-handles can be used:
|
|
/// - XOS_THD_STATS_IDLE -- stats for idle thread
|
|
/// - XOS_THD_STATS_INTR -- stats for interrupt processing
|
|
///
|
|
/// \param stats Pointer to XosThreadStats struct to be filled in.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code.
|
|
///
|
|
/// NOTE: Can be called from interrupt context.
|
|
/// NOTE: This call will not fill in the "thread" and "cpu_pct" fields in the
|
|
/// "stats" structure. The thread handle is already known, and calculating the
|
|
/// CPU loading can take quite a bit of time so is not done here.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_thread_get_stats(XosThread * thread, XosThreadStats * stats);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
///
|
|
/// Get CPU loading statistics for the system. This function computes the CPU
|
|
/// percentage use for all threads in the system (including the idle thread and
|
|
/// the 'interrupt thread' (interrupt context). It also returns the cycle count
|
|
/// and number of context switches for each thread.
|
|
/// Statistics are only available if XOS_OPT_STATS has been enabled.
|
|
/// Otherwise, the function will return XOS_OK, but the structure contents will
|
|
/// be undefined.
|
|
///
|
|
/// IMPORTANT: The entry for interrupt context does not contain a real thread
|
|
/// handle. It uses the pseudo-handle XOS_THD_STATS_INTR to indicate that this
|
|
/// entry reports interrupt statistics. This pseudo-handle cannot be used for
|
|
/// any other thread operations or queries.
|
|
///
|
|
/// NOTE: This function disables interrupts while traversing the thread list.
|
|
/// It does not leave interrupts disabled during the computations, as that can
|
|
/// take a fair amount of time.
|
|
///
|
|
/// \param stats Pointer to an array of XosThreadStats structures.
|
|
/// The array must be large enough to accommodate all
|
|
/// threads in the system.
|
|
///
|
|
/// \param size The number of elements available in the array. If
|
|
/// this is smaller than the number of threads plus one
|
|
/// (for the interrupt context) then XOS_ERR_INVALID_PARAMETER
|
|
/// will be returned and '*size' will be set to the
|
|
/// minimum number of elements required. On a successful
|
|
/// return, '*size' is set to the number of elements
|
|
/// actually filled in.
|
|
///
|
|
/// \param reset If nonzero, then thread stats counters are reset
|
|
/// after reading. This is useful if you want to track
|
|
/// the stats so as to get a better idea of current
|
|
/// system loading. E.g. calling this function once a
|
|
/// second with 'reset' nonzero will provide CPU load
|
|
/// information for the last second on each call.
|
|
///
|
|
/// \return Returns XOS_OK on success, else error code. In particular,
|
|
/// XOS_ERR_INVALID_PARAMETER will be returned if the output buffer
|
|
/// is too small.
|
|
///
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_get_cpu_load(XosThreadStats * stats, int32_t * size, int32_t reset);
|
|
|
|
|
|
#ifdef _XOS_INCLUDE_INTERNAL_
|
|
|
|
// Signature of valid thread object
|
|
#define XOS_THREAD_SIG 0x54485244
|
|
|
|
|
|
// Extern functions
|
|
void
|
|
xos_init(void);
|
|
|
|
bool
|
|
xos_init_done(void);
|
|
|
|
bool
|
|
xos_started(void);
|
|
|
|
int32_t
|
|
xos_schedule(XosThread * curr_thread);
|
|
|
|
void
|
|
xos_q_remove(XosThreadQueue * queue, XosThread * thread);
|
|
|
|
XosThread *
|
|
xos_q_pop(XosThreadQueue * queue);
|
|
|
|
int32_t
|
|
xos_wake_queue(XosThreadQueue * queue, const char * expected_cause, int32_t wake_value);
|
|
|
|
// Well known block causes
|
|
extern const char * const xos_blkon_idle; // (for idle thread only)
|
|
extern const char * const xos_blkon_suspend;
|
|
extern const char * const xos_blkon_delay;
|
|
extern const char * const xos_blkon_exited;
|
|
extern const char * const xos_blkon_join;
|
|
extern const char * const xos_blkon_event;
|
|
extern const char * const xos_blkon_condition;
|
|
extern const char * const xos_blkon_mutex;
|
|
extern const char * const xos_blkon_sem;
|
|
extern const char * const xos_blkon_msgq;
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Blocks the current active thread.
|
|
//
|
|
// Currently, this can be called from an interrupt handler to block the thread
|
|
// that was interrupted. Note that in interrupt context the current thread can
|
|
// already be in the blocked state, due to a previous call to this function.
|
|
// Can be called with interrupts enabled.
|
|
//
|
|
// block_cause Reason for blocking.
|
|
//
|
|
// block_queue Queue on to which this thread should be pushed once it
|
|
// is blocked. Can be NULL.
|
|
//
|
|
// must_schedule If nonzero, then forces a scheduling operation to pick
|
|
// the next thread to run, even if there are ready threads
|
|
// at the same priority level as the blocked thread.
|
|
//
|
|
// use_priority If nonzero, then the blocked thread will be queued in
|
|
// priority order in the specified block queue. If zero,
|
|
// the thread is queued in FIFO order. If no queue has
|
|
// been specified, this parameter is ignored.
|
|
//
|
|
// Returns: The value passed by xos_thread_wake().
|
|
//-----------------------------------------------------------------------------
|
|
int32_t
|
|
xos_block(const char * block_cause,
|
|
XosThreadQueue * block_queue,
|
|
int32_t must_schedule,
|
|
int32_t use_priority);
|
|
|
|
|
|
//-----------------------------------------------------------------------------
|
|
// Unblocks the specified blocked thread and puts it at the tail end of its
|
|
// ready queue. Schedules it if it is higher priority than the current thread.
|
|
// No effect if the thread is not blocked with the specified cause.
|
|
//
|
|
// thread The thread to wake up (make ready).
|
|
//
|
|
// expected_cause The expected block cause of the thread. Thread will be
|
|
// woken only if its block cause matches this cause, or if
|
|
// expected_cause is zero.
|
|
//
|
|
// wake_value The value to be passed to the woken thread as a return
|
|
// value from xos_thread_block().
|
|
//
|
|
// Returns: nothing.
|
|
//
|
|
// The target thread can be woken at a different priority by changing its
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// priority while the thread is blocked.
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// Can be called with interrupts enabled. Can be called in interrupt context.
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//-----------------------------------------------------------------------------
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void
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xos_thread_wake(XosThread * thread, const char * expected_cause, int32_t wakevalue);
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|
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//-----------------------------------------------------------------------------
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// Function to init C library per-thread and reentrancy support.
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//-----------------------------------------------------------------------------
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#if XOS_OPT_THREAD_SAFE_CLIB
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|
void
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|
xos_clib_init(void);
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|
|
|
void
|
|
xos_clib_thread_init(XosThread * thread);
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|
|
|
void
|
|
xos_clib_thread_cleanup(XosThread * thread);
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|
#endif
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|
|
|
#endif
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|
|
|
|
|
#ifdef __cplusplus
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|
}
|
|
#endif
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|
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|
#endif // __XOS_THREAD_H__
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|