731603a92b
This change brings the default size of the main shmem block back under 1MB, which is a fairly popular value for the kernel's SHMMAX parameter.
156 lines
3.6 KiB
C
156 lines
3.6 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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* 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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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.23 1999/03/06 21:17:41 tgl Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <string.h>
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#include <sys/types.h>
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#include "postgres.h"
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#include "storage/ipc.h"
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#include "storage/sinval.h"
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#include "storage/bufmgr.h"
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#include "storage/proc.h"
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#include "storage/smgr.h"
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#include "storage/lock.h"
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#include "miscadmin.h" /* for DebugLvl */
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/*
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* SystemPortAddressCreateMemoryKey
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* Returns a memory key given a port address.
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*/
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IPCKey
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SystemPortAddressCreateIPCKey(SystemPortAddress address)
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{
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Assert(address < 32768); /* XXX */
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return SystemPortAddressGetIPCKey(address);
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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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/**************************************************
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CreateSharedMemoryAndSemaphores
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is called exactly *ONCE* by the postmaster.
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It is *NEVER* called by the postgres backend,
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except in the case of a standalone backend.
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0) destroy any existing semaphores for both buffer
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and lock managers.
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1) create the appropriate *SHARED* memory segments
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for the two resource managers.
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2) create shared semaphores as needed.
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**************************************************/
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void
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CreateSharedMemoryAndSemaphores(IPCKey key, int maxBackends)
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{
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int size;
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#ifdef HAS_TEST_AND_SET
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/* ---------------
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* create shared memory for slocks
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* --------------
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*/
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CreateAndInitSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
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#endif
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/* ----------------
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* kill and create the buffer manager buffer pool (and semaphore)
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* ----------------
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*/
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CreateSpinlocks(IPCKeyGetSpinLockSemaphoreKey(key));
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/*
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* Size of the primary shared-memory block is estimated via
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* moderately-accurate estimates for the big hogs, plus 100K for
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* the stuff that's too small to bother with estimating.
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*/
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size = BufferShmemSize() + LockShmemSize(maxBackends);
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#ifdef STABLE_MEMORY_STORAGE
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size += MMShmemSize();
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#endif
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size += 100000;
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if (DebugLvl > 1)
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{
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fprintf(stderr, "binding ShmemCreate(key=%x, size=%d)\n",
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IPCKeyGetBufferMemoryKey(key), size);
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}
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ShmemCreate(IPCKeyGetBufferMemoryKey(key), size);
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ShmemIndexReset();
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InitShmem(key, size);
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InitBufferPool(key);
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/* ----------------
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* do the lock table stuff
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* ----------------
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*/
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InitLocks();
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if (InitLockTable() == INVALID_TABLEID)
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elog(FATAL, "Couldn't create the lock table");
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/* ----------------
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* do process table stuff
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* ----------------
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*/
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InitProcGlobal(key, maxBackends);
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CreateSharedInvalidationState(key);
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}
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/*
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* AttachSharedMemoryAndSemaphores
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* Attachs existant shared memory and semaphores.
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*/
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void
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AttachSharedMemoryAndSemaphores(IPCKey key)
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{
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/* ----------------
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* create rather than attach if using private key
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* ----------------
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*/
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if (key == PrivateIPCKey)
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{
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CreateSharedMemoryAndSemaphores(key, 16);
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return;
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}
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#ifdef HAS_TEST_AND_SET
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/* ----------------
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* attach the slock shared memory
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* ----------------
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*/
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AttachSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
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#endif
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/* ----------------
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* attach the buffer manager buffer pool (and semaphore)
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* ----------------
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*/
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InitShmem(key, 0);
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InitBufferPool(key);
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/* ----------------
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* initialize lock table stuff
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* ----------------
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*/
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InitLocks();
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if (InitLockTable() == INVALID_TABLEID)
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elog(FATAL, "Couldn't attach to the lock table");
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AttachSharedInvalidationState(key);
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}
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