270 lines
7.3 KiB
C
270 lines
7.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* ipci.c
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* POSTGRES inter-process communication initialization code.
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*
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* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/storage/ipc/ipci.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/clog.h"
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#include "access/commit_ts.h"
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#include "access/heapam.h"
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#include "access/multixact.h"
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#include "access/nbtree.h"
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#include "access/subtrans.h"
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#include "access/twophase.h"
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#include "commands/async.h"
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#include "miscadmin.h"
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#include "pgstat.h"
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#include "postmaster/autovacuum.h"
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#include "postmaster/bgworker_internals.h"
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#include "postmaster/bgwriter.h"
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#include "postmaster/postmaster.h"
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#include "replication/slot.h"
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#include "replication/walreceiver.h"
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#include "replication/walsender.h"
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#include "storage/bufmgr.h"
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#include "storage/dsm.h"
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#include "storage/ipc.h"
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#include "storage/pg_shmem.h"
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#include "storage/pmsignal.h"
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#include "storage/predicate.h"
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#include "storage/proc.h"
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#include "storage/procarray.h"
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#include "storage/procsignal.h"
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#include "storage/sinvaladt.h"
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#include "storage/spin.h"
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shmem_startup_hook_type shmem_startup_hook = NULL;
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static Size total_addin_request = 0;
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static bool addin_request_allowed = true;
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/*
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* RequestAddinShmemSpace
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* Request that extra shmem space be allocated for use by
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* a loadable module.
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*
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* This is only useful if called from the _PG_init hook of a library that
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* is loaded into the postmaster via shared_preload_libraries. Once
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* shared memory has been allocated, calls will be ignored. (We could
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* raise an error, but it seems better to make it a no-op, so that
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* libraries containing such calls can be reloaded if needed.)
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*/
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void
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RequestAddinShmemSpace(Size size)
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{
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if (IsUnderPostmaster || !addin_request_allowed)
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return; /* too late */
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total_addin_request = add_size(total_addin_request, size);
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}
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/*
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* CreateSharedMemoryAndSemaphores
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* Creates and initializes shared memory and semaphores.
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*
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* This is called by the postmaster or by a standalone backend.
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* It is also called by a backend forked from the postmaster in the
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* EXEC_BACKEND case. In the latter case, the shared memory segment
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* already exists and has been physically attached to, but we have to
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* initialize pointers in local memory that reference the shared structures,
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* because we didn't inherit the correct pointer values from the postmaster
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* as we do in the fork() scenario. The easiest way to do that is to run
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* through the same code as before. (Note that the called routines mostly
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* check IsUnderPostmaster, rather than EXEC_BACKEND, to detect this case.
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* This is a bit code-wasteful and could be cleaned up.)
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*
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* If "makePrivate" is true then we only need private memory, not shared
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* memory. This is true for a standalone backend, false for a postmaster.
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*/
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void
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CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
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{
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PGShmemHeader *shim = NULL;
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if (!IsUnderPostmaster)
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{
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PGShmemHeader *seghdr;
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Size size;
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int numSemas;
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/*
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* Size of the Postgres shared-memory block is estimated via
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* moderately-accurate estimates for the big hogs, plus 100K for the
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* stuff that's too small to bother with estimating.
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*
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* We take some care during this phase to ensure that the total size
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* request doesn't overflow size_t. If this gets through, we don't
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* need to be so careful during the actual allocation phase.
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*/
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size = 100000;
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size = add_size(size, SpinlockSemaSize());
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size = add_size(size, hash_estimate_size(SHMEM_INDEX_SIZE,
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sizeof(ShmemIndexEnt)));
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size = add_size(size, BufferShmemSize());
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size = add_size(size, LockShmemSize());
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size = add_size(size, PredicateLockShmemSize());
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size = add_size(size, ProcGlobalShmemSize());
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size = add_size(size, XLOGShmemSize());
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size = add_size(size, CLOGShmemSize());
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size = add_size(size, CommitTsShmemSize());
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size = add_size(size, SUBTRANSShmemSize());
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size = add_size(size, TwoPhaseShmemSize());
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size = add_size(size, BackgroundWorkerShmemSize());
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size = add_size(size, MultiXactShmemSize());
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size = add_size(size, LWLockShmemSize());
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size = add_size(size, ProcArrayShmemSize());
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size = add_size(size, BackendStatusShmemSize());
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size = add_size(size, SInvalShmemSize());
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size = add_size(size, PMSignalShmemSize());
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size = add_size(size, ProcSignalShmemSize());
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size = add_size(size, CheckpointerShmemSize());
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size = add_size(size, AutoVacuumShmemSize());
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size = add_size(size, ReplicationSlotsShmemSize());
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size = add_size(size, WalSndShmemSize());
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size = add_size(size, WalRcvShmemSize());
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size = add_size(size, BTreeShmemSize());
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size = add_size(size, SyncScanShmemSize());
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size = add_size(size, AsyncShmemSize());
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#ifdef EXEC_BACKEND
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size = add_size(size, ShmemBackendArraySize());
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#endif
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/* freeze the addin request size and include it */
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addin_request_allowed = false;
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size = add_size(size, total_addin_request);
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/* might as well round it off to a multiple of a typical page size */
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size = add_size(size, 8192 - (size % 8192));
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elog(DEBUG3, "invoking IpcMemoryCreate(size=%zu)", size);
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/*
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* Create the shmem segment
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*/
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seghdr = PGSharedMemoryCreate(size, makePrivate, port, &shim);
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InitShmemAccess(seghdr);
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/*
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* Create semaphores
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*/
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numSemas = ProcGlobalSemas();
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numSemas += SpinlockSemas();
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PGReserveSemaphores(numSemas, port);
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}
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else
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{
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/*
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* We are reattaching to an existing shared memory segment. This
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* should only be reached in the EXEC_BACKEND case, and even then only
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* with makePrivate == false.
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*/
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#ifdef EXEC_BACKEND
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Assert(!makePrivate);
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#else
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elog(PANIC, "should be attached to shared memory already");
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#endif
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}
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/*
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* Set up shared memory allocation mechanism
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*/
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if (!IsUnderPostmaster)
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InitShmemAllocation();
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/*
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* Now initialize LWLocks, which do shared memory allocation and are
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* needed for InitShmemIndex.
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*/
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CreateLWLocks();
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/*
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* Set up shmem.c index hashtable
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*/
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InitShmemIndex();
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/*
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* Set up xlog, clog, and buffers
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*/
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XLOGShmemInit();
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CLOGShmemInit();
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CommitTsShmemInit();
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SUBTRANSShmemInit();
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MultiXactShmemInit();
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InitBufferPool();
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/*
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* Set up lock manager
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*/
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InitLocks();
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/*
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* Set up predicate lock manager
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*/
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InitPredicateLocks();
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/*
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* Set up process table
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*/
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if (!IsUnderPostmaster)
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InitProcGlobal();
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CreateSharedProcArray();
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CreateSharedBackendStatus();
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TwoPhaseShmemInit();
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BackgroundWorkerShmemInit();
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/*
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* Set up shared-inval messaging
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*/
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CreateSharedInvalidationState();
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/*
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* Set up interprocess signaling mechanisms
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*/
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PMSignalShmemInit();
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ProcSignalShmemInit();
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CheckpointerShmemInit();
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AutoVacuumShmemInit();
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ReplicationSlotsShmemInit();
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WalSndShmemInit();
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WalRcvShmemInit();
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/*
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* Set up other modules that need some shared memory space
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*/
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BTreeShmemInit();
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SyncScanShmemInit();
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AsyncShmemInit();
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#ifdef EXEC_BACKEND
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/*
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* Alloc the win32 shared backend array
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*/
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if (!IsUnderPostmaster)
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ShmemBackendArrayAllocation();
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#endif
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/* Initialize dynamic shared memory facilities. */
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if (!IsUnderPostmaster)
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dsm_postmaster_startup(shim);
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/*
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* Now give loadable modules a chance to set up their shmem allocations
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*/
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if (shmem_startup_hook)
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shmem_startup_hook();
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}
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