ec6550c6c0
deals with the queue, including locking etc, is all in sinvaladt.c. This means that the struct definition of the queue, and the queue pointer, are now internal "implementation details" inside sinvaladt.c. Per my proposal dated 25-Jun-2007 and followup discussion.
232 lines
6.2 KiB
C
232 lines
6.2 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) 1996-2008, 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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* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.95 2008/03/16 19:47:33 alvherre Exp $
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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/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 "miscadmin.h"
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#include "pgstat.h"
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#include "postmaster/autovacuum.h"
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#include "postmaster/bgwriter.h"
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#include "postmaster/postmaster.h"
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#include "storage/freespace.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/procarray.h"
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#include "storage/sinvaladt.h"
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#include "storage/spin.h"
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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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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, 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, 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, SUBTRANSShmemSize());
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size = add_size(size, TwoPhaseShmemSize());
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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, FreeSpaceShmemSize());
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size = add_size(size, BgWriterShmemSize());
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size = add_size(size, AutoVacuumShmemSize());
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size = add_size(size, BTreeShmemSize());
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size = add_size(size, SyncScanShmemSize());
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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=%lu)",
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(unsigned long) 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);
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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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if (!IsUnderPostmaster)
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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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SUBTRANSShmemInit();
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TwoPhaseShmemInit();
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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 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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/*
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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 free-space map
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*/
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InitFreeSpaceMap();
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/*
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* Set up interprocess signaling mechanisms
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*/
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PMSignalInit();
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BgWriterShmemInit();
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AutoVacuumShmemInit();
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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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#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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}
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