Two copies...
This commit is contained in:
Vadim B. Mikheev
parent
90d490059d
commit
94e52d38df
|
|
@ -7,411 +7,7 @@
|
|||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.1 1997/09/18 14:20:59 momjian Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
/*
|
||||
* DESCRIPTION
|
||||
* The following code fragment should be written (in assembly
|
||||
* language) on machines that have a native test-and-set instruction:
|
||||
*
|
||||
* void
|
||||
* S_LOCK(char_address)
|
||||
* char *char_address;
|
||||
* {
|
||||
* while (test_and_set(char_address))
|
||||
* ;
|
||||
* }
|
||||
*
|
||||
* If this is not done, POSTGRES will default to using System V
|
||||
* semaphores (and take a large performance hit -- around 40% of
|
||||
* its time on a DS5000/240 is spent in semop(3)...).
|
||||
*
|
||||
* NOTES
|
||||
* AIX has a test-and-set but the recommended interface is the cs(3)
|
||||
* system call. This provides an 8-instruction (plus system call
|
||||
* overhead) uninterruptible compare-and-set operation. True
|
||||
* spinlocks might be faster but using cs(3) still speeds up the
|
||||
* regression test suite by about 25%. I don't have an assembler
|
||||
* manual for POWER in any case.
|
||||
*
|
||||
*/
|
||||
#ifndef S_LOCK_H
|
||||
#define S_LOCK_H
|
||||
|
||||
#include "storage/ipc.h"
|
||||
|
||||
#if defined(HAS_TEST_AND_SET)
|
||||
|
||||
#if defined (nextstep)
|
||||
/*
|
||||
* NEXTSTEP (mach)
|
||||
* slock_t is defined as a struct mutex.
|
||||
*/
|
||||
#define S_LOCK(lock) mutex_lock(lock)
|
||||
|
||||
#define S_UNLOCK(lock) mutex_unlock(lock)
|
||||
|
||||
#define S_INIT_LOCK(lock) mutex_init(lock)
|
||||
|
||||
/* S_LOCK_FREE should return 1 if lock is free; 0 if lock is locked */
|
||||
/* For Mach, we have to delve inside the entrails of `struct mutex'. Ick! */
|
||||
#define S_LOCK_FREE(alock) ((alock)->lock == 0)
|
||||
|
||||
#endif /* next */
|
||||
|
||||
|
||||
|
||||
#if defined(irix5)
|
||||
/*
|
||||
* SGI IRIX 5
|
||||
* slock_t is defined as a struct abilock_t, which has a single unsigned long
|
||||
* member.
|
||||
*
|
||||
* This stuff may be supplemented in the future with Masato Kataoka's MIPS-II
|
||||
* assembly from his NECEWS SVR4 port, but we probably ought to retain this
|
||||
* for the R3000 chips out there.
|
||||
*/
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (!acquire_lock(lock)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) release_lock(lock)
|
||||
|
||||
#define S_INIT_LOCK(lock) init_lock(lock)
|
||||
|
||||
/* S_LOCK_FREE should return 1 if lock is free; 0 if lock is locked */
|
||||
|
||||
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
|
||||
|
||||
#endif /* irix5 */
|
||||
|
||||
|
||||
/*
|
||||
* OSF/1 (Alpha AXP)
|
||||
*
|
||||
* Note that slock_t on the Alpha AXP is msemaphore instead of char
|
||||
* (see storage/ipc.h).
|
||||
*/
|
||||
|
||||
#if defined(__alpha__) || defined(__alpha)
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (msem_lock((lock), MSEM_IF_NOWAIT) < 0) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) msem_unlock((lock), 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) msem_init((lock), MSEM_UNLOCKED)
|
||||
|
||||
#define S_LOCK_FREE(lock) (!(lock)->msem_state)
|
||||
|
||||
#endif /* alpha */
|
||||
|
||||
/*
|
||||
* Solaris 2
|
||||
*/
|
||||
|
||||
#if defined(i386_solaris) || \
|
||||
defined(sparc_solaris)
|
||||
/* for xxxxx_solaris, this is defined in port/.../tas.s */
|
||||
|
||||
static int tas(slock_t *lock);
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (tas(lock)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* i86pc_solaris || sparc_solaris */
|
||||
|
||||
/*
|
||||
* AIX (POWER)
|
||||
*
|
||||
* Note that slock_t on POWER/POWER2/PowerPC is int instead of char
|
||||
* (see storage/ipc.h).
|
||||
*/
|
||||
|
||||
#if defined(aix)
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (cs((int *) (lock), 0, 1)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* aix */
|
||||
|
||||
/*
|
||||
* HP-UX (PA-RISC)
|
||||
*
|
||||
* Note that slock_t on PA-RISC is a structure instead of char
|
||||
* (see storage/ipc.h).
|
||||
*/
|
||||
|
||||
#if defined(hpux)
|
||||
|
||||
/*
|
||||
* a "set" slock_t has a single word cleared. a "clear" slock_t has
|
||||
* all words set to non-zero.
|
||||
*/
|
||||
static slock_t clear_lock = {-1, -1, -1, -1};
|
||||
|
||||
static int tas(slock_t *lock);
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (tas(lock)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = clear_lock) /* struct assignment */
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#define S_LOCK_FREE(lock) ( *(int *) (((long) (lock) + 15) & ~15) != 0)
|
||||
|
||||
#endif /* hpux */
|
||||
|
||||
/*
|
||||
* sun3
|
||||
*/
|
||||
|
||||
#if defined(sun3)
|
||||
|
||||
static int tas(slock_t *lock);
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (tas(lock)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#ifdef NOT_USED
|
||||
static int
|
||||
tas_dummy()
|
||||
{
|
||||
asm("LLA0:");
|
||||
asm(" .data");
|
||||
asm(" .text");
|
||||
asm("|#PROC# 04");
|
||||
asm(" .globl _tas");
|
||||
asm("_tas:");
|
||||
asm("|#PROLOGUE# 1");
|
||||
asm(" movel sp@(0x4),a0");
|
||||
asm(" tas a0@");
|
||||
asm(" beq LLA1");
|
||||
asm(" moveq #-128,d0");
|
||||
asm(" rts");
|
||||
asm("LLA1:");
|
||||
asm(" moveq #0,d0");
|
||||
asm(" rts");
|
||||
asm(" .data");
|
||||
}
|
||||
#endif
|
||||
|
||||
#endif /* sun3 */
|
||||
|
||||
/*
|
||||
* sparc machines
|
||||
*/
|
||||
|
||||
#if defined(NEED_SPARC_TAS_ASM)
|
||||
|
||||
/* if we're using -ansi w/ gcc, use __asm__ instead of asm */
|
||||
#if defined(__STRICT_ANSI__)
|
||||
#define asm(x) __asm__(x)
|
||||
#endif
|
||||
|
||||
static int tas(slock_t *lock);
|
||||
|
||||
#ifdef NOT_USED
|
||||
static int
|
||||
tas_dummy()
|
||||
{
|
||||
asm(".seg \"data\"");
|
||||
asm(".seg \"text\"");
|
||||
asm(".global _tas");
|
||||
asm("_tas:");
|
||||
|
||||
/*
|
||||
* Sparc atomic test and set (sparc calls it "atomic load-store")
|
||||
*/
|
||||
|
||||
asm("ldstub [%r8], %r8");
|
||||
|
||||
/*
|
||||
* Did test and set actually do the set?
|
||||
*/
|
||||
|
||||
asm("tst %r8");
|
||||
|
||||
asm("be,a ReturnZero");
|
||||
|
||||
/*
|
||||
* otherwise, just return.
|
||||
*/
|
||||
|
||||
asm("clr %r8");
|
||||
asm("mov 0x1, %r8");
|
||||
asm("ReturnZero:");
|
||||
asm("retl");
|
||||
asm("nop");
|
||||
}
|
||||
#endif
|
||||
|
||||
#define S_LOCK(addr) do \
|
||||
{ \
|
||||
while (tas(addr)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
/*
|
||||
* addr should be as in the above S_LOCK routine
|
||||
*/
|
||||
#define S_UNLOCK(addr) (*(addr) = 0)
|
||||
|
||||
#define S_INIT_LOCK(addr) (*(addr) = 0)
|
||||
|
||||
#endif /* NEED_SPARC_TAS_ASM */
|
||||
|
||||
/*
|
||||
* i386 based things
|
||||
*/
|
||||
|
||||
#if defined(NEED_I386_TAS_ASM)
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
slock_t res; \
|
||||
do \
|
||||
{ \
|
||||
__asm__("xchgb %0,%1": "=q"(res), "=m"(*lock):"0"(0x1)); \
|
||||
} while (res != 0); \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* NEED_I386_TAS_ASM */
|
||||
|
||||
|
||||
#if defined(__alpha__) && defined(linux)
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
slock_t res; \
|
||||
do \
|
||||
{ \
|
||||
__asm__(" ldq $0, %0 \n\
|
||||
bne $0, already_set \n\
|
||||
ldq_l $0, %0 \n\
|
||||
bne $0, already_set \n\
|
||||
or $31, 1, $0 \n\
|
||||
stq_c $0, %0 \n\
|
||||
beq $0, stqc_fail \n\
|
||||
success: bis $31, $31, %1 \n\
|
||||
mb \n\
|
||||
jmp $31, end \n\
|
||||
stqc_fail: or $31, 1, $0 \n\
|
||||
already_set: bis $0, $0, %1 \n\
|
||||
end: nop ": "=m"(*lock), "=r"(res): :"0"); \
|
||||
} while (res != 0); \
|
||||
} while (0)
|
||||
|
||||
|
||||
#define S_UNLOCK(lock) (__asm__("mb"), *(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* defined(__alpha__) && defined(linux) */
|
||||
|
||||
#if defined(linux) && defined(sparc)
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
slock_t res; \
|
||||
do \
|
||||
{ \
|
||||
__asm__("ldstub [%1], %0" \
|
||||
: "=&r"(res) \
|
||||
: "r"(lock)); \
|
||||
} while (!res != 0); \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* defined(linux) && defined(sparc) */
|
||||
|
||||
#if defined(linux) && defined(PPC)
|
||||
|
||||
#ifdef NOT_USED
|
||||
static int
|
||||
tas_dummy()
|
||||
{
|
||||
__asm__(" \n\
|
||||
tas: \n\
|
||||
lwarx 5,0,3 \n\
|
||||
cmpwi 5,0 \n\
|
||||
bne fail \n\
|
||||
addi 5,5,1 \n\
|
||||
stwcx. 5,0,3 \n\
|
||||
beq success \n\
|
||||
fail: li 3,1 \n\
|
||||
blr \n\
|
||||
success: \n\
|
||||
li 3,0 \n\
|
||||
blr \n\
|
||||
");
|
||||
}
|
||||
#endif
|
||||
|
||||
#define S_LOCK(lock) do \
|
||||
{ \
|
||||
while (tas(lock)) \
|
||||
; \
|
||||
} while (0)
|
||||
|
||||
#define S_UNLOCK(lock) (*(lock) = 0)
|
||||
|
||||
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
||||
|
||||
#endif /* defined(linux) && defined(PPC) */
|
||||
|
||||
#endif /* HAS_TEST_AND_SET */
|
||||
|
||||
#endif /* S_LOCK_H */
|
||||
/*-------------------------------------------------------------------------
|
||||
*
|
||||
* s_lock.h--
|
||||
* This file contains the implementation (if any) for spinlocks.
|
||||
*
|
||||
* Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
*
|
||||
* IDENTIFICATION
|
||||
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.1 1997/09/18 14:20:59 momjian Exp $
|
||||
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.2 1997/09/22 04:21:51 vadim Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue