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Rearrange backend startup sequence so that ShmemIndexLock can become

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an LWLock instead of a spinlock.  This hardly matters on Unix machines
but should improve startup performance on Windows (or any port using
EXEC_BACKEND).  Per previous discussion.
This commit is contained in:
Tom Lane
2006-01-04 21:06:32 +00:00
parent e0078ea22d
commit 349f40b2c2
15 changed files with 414 additions and 259 deletions
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16
src/backend/storage/ipc/ipci.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.80 2005/12/09 01:22:03 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.81 2006/01/04 21:06:31 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -57,10 +57,9 @@
void
CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
{
PGShmemHeader *seghdr = NULL;
if (!IsUnderPostmaster)
{
PGShmemHeader *seghdr;
Size size;
int numSemas;
@@ -104,6 +103,8 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
*/
seghdr = PGSharedMemoryCreate(size, makePrivate, port);
InitShmemAccess(seghdr);
/*
* Create semaphores
*/
@@ -120,18 +121,16 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
*/
#ifdef EXEC_BACKEND
Assert(!makePrivate);
Assert(UsedShmemSegAddr != NULL);
seghdr = UsedShmemSegAddr;
#else
elog(PANIC, "should be attached to shared memory already");
#endif
}
/*
* Set up shared memory allocation mechanism
*/
InitShmemAllocation(seghdr, !IsUnderPostmaster);
if (!IsUnderPostmaster)
InitShmemAllocation();
/*
* Now initialize LWLocks, which do shared memory allocation and are
@@ -163,7 +162,8 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
/*
* Set up process table
*/
InitProcGlobal();
if (!IsUnderPostmaster)
InitProcGlobal();
CreateSharedProcArray();
/*