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Significant cleanups in SysV IPC handling (shared mem and semaphores).

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IPC key assignment will now work correctly even when multiple postmasters
are using same logical port number (which is possible given -k switch).
There is only one shared-mem segment per postmaster now, not 3.
Rip out broken code for non-TAS case in bufmgr and xlog, substitute a
complete S_LOCK emulation using semaphores in spin.c.  TAS and non-TAS
logic is now exactly the same.
When deadlock is detected, "Deadlock detected" is now the elog(ERROR)
message, rather than a NOTICE that comes out before an unhelpful ERROR.
This commit is contained in:
Tom Lane
2000-11-28 23:27:57 +00:00
parent 914822713c
commit c715fdea26
27 changed files with 1172 additions and 1755 deletions
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32
src/backend/utils/init/postinit.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.72 2000/11/16 22:30:39 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/init/postinit.c,v 1.73 2000/11/28 23:27:57 tgl Exp $
*
*
*-------------------------------------------------------------------------
@ -45,7 +45,6 @@
static void ReverifyMyDatabase(const char *name);
static void InitCommunication(void);
static IPCKey PostgresIpcKey;
/*** InitPostgres support ***/
@ -141,7 +140,7 @@ ReverifyMyDatabase(const char *name)
* --------------------------------
*/
static void
InitCommunication()
InitCommunication(void)
{
/* ----------------
* initialize shared memory and semaphores appropriately.
@ -151,26 +150,11 @@ InitCommunication()
{
/* ----------------
* we're running a postgres backend by itself with
* no front end or postmaster.
* no front end or postmaster. Create private "shmem"
* and semaphores. Setting MaxBackends = 16 is arbitrary.
* ----------------
*/
char *ipc_key; /* value of environment variable */
IPCKey key;
ipc_key = getenv("IPC_KEY");
if (!PointerIsValid(ipc_key))
{
/* Normal standalone backend */
key = PrivateIPCKey;
}
else
{
/* Allow standalone's IPC key to be set */
key = atoi(ipc_key);
}
PostgresIpcKey = key;
AttachSharedMemoryAndSemaphores(key);
CreateSharedMemoryAndSemaphores(true, 16);
}
}
@ -295,7 +279,7 @@ InitPostgres(const char *dbname, const char *username)
/*
* Set up my per-backend PROC struct in shared memory.
*/
InitProcess(PostgresIpcKey);
InitProcess();
/*
* Initialize my entry in the shared-invalidation manager's array of
@ -307,7 +291,7 @@ InitPostgres(const char *dbname, const char *username)
*/
MyBackendId = InvalidBackendId;
InitSharedInvalidationState();
InitBackendSharedInvalidationState();
if (MyBackendId > MAXBACKENDS || MyBackendId <= 0)
elog(FATAL, "cinit2: bad backend id %d", MyBackendId);
@ -365,11 +349,11 @@ BaseInit(void)
*/
InitCommunication();
DebugFileOpen();
smgrinit();
EnablePortalManager(); /* memory for portal/transaction stuff */
/* initialize the local buffer manager */
InitLocalBuffer();
}