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Create an internal semaphore API that is not tied to SysV semaphores.

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As proof of concept, provide an alternate implementation based on POSIX
semaphores.  Also push the SysV shared-memory implementation into a
separate file so that it can be replaced conveniently.
This commit is contained in:
Tom Lane
2002-05-05 00:03:29 +00:00
parent 91fc10fdac
commit 72a3902a66
37 changed files with 1659 additions and 1370 deletions
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18
src/backend/storage/ipc/ipci.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.46 2002/03/02 21:39:29 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.47 2002/05/05 00:03:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,8 +21,11 @@
#include "access/xlog.h"
#include "storage/bufmgr.h"
#include "storage/freespace.h"
#include "storage/ipc.h"
#include "storage/lmgr.h"
#include "storage/lwlock.h"
#include "storage/pg_sema.h"
#include "storage/pg_shmem.h"
#include "storage/pmsignal.h"
#include "storage/proc.h"
#include "storage/sinval.h"
@@ -41,9 +44,12 @@
* memory. This is true for a standalone backend, false for a postmaster.
*/
void
CreateSharedMemoryAndSemaphores(bool makePrivate, int maxBackends)
CreateSharedMemoryAndSemaphores(bool makePrivate,
int maxBackends,
int port)
{
int size;
int numSemas;
PGShmemHeader *seghdr;
/*
@@ -70,12 +76,14 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int maxBackends)
/*
* Create the shmem segment
*/
seghdr = IpcMemoryCreate(size, makePrivate, IPCProtection);
seghdr = PGSharedMemoryCreate(size, makePrivate, port);
/*
* First initialize spinlocks --- needed by InitShmemAllocation()
* Create semaphores
*/
CreateSpinlocks();
numSemas = ProcGlobalSemas(maxBackends);
numSemas += SpinlockSemas();
PGReserveSemaphores(numSemas, port);
/*
* Set up shared memory allocation mechanism