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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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157
src/backend/storage/ipc/ipci.c
View File

@@ -8,148 +8,91 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.34 2000/11/21 21:16:01 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.35 2000/11/28 23:27:56 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include <sys/types.h>
#include "postgres.h"
#include <sys/types.h>
#include "miscadmin.h"
#include "access/xlog.h"
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "storage/sinval.h"
#include "storage/spin.h"
/*
* SystemPortAddressCreateMemoryKey
* Returns a memory key given a port address.
*/
IPCKey
SystemPortAddressCreateIPCKey(SystemPortAddress address)
{
Assert(address < 32768); /* XXX */
return SystemPortAddressGetIPCKey(address);
}
/*
* CreateSharedMemoryAndSemaphores
* Creates and initializes shared memory and semaphores.
*
* This is called by the postmaster or by a standalone backend.
* It is NEVER called by a backend forked from the postmaster;
* for such a backend, the shared memory is already ready-to-go.
*
* If "private" is true then we only need private memory, not shared
* memory. This is true for a standalone backend, false for a postmaster.
*/
/**************************************************
CreateSharedMemoryAndSemaphores
is called exactly *ONCE* by the postmaster.
It is *NEVER* called by the postgres backend,
except in the case of a standalone backend.
0) destroy any existing semaphores for both buffer
and lock managers.
1) create the appropriate *SHARED* memory segments
for the two resource managers.
2) create shared semaphores as needed.
**************************************************/
void
CreateSharedMemoryAndSemaphores(IPCKey key, int maxBackends)
CreateSharedMemoryAndSemaphores(bool private, int maxBackends)
{
int size;
#ifdef HAS_TEST_AND_SET
PGShmemHeader *seghdr;
/*
* Create shared memory for slocks
*/
CreateAndInitSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
#endif
/*
* Kill and create the buffer manager buffer pool (and semaphore)
*/
CreateSpinlocks(IPCKeyGetSpinLockSemaphoreKey(key));
/*
* Size of the primary shared-memory block is estimated via
* Size of the Postgres shared-memory block is estimated via
* moderately-accurate estimates for the big hogs, plus 100K for the
* stuff that's too small to bother with estimating.
*/
size = BufferShmemSize() + LockShmemSize(maxBackends) + XLOGShmemSize();
size = BufferShmemSize() + LockShmemSize(maxBackends) +
XLOGShmemSize() + SLockShmemSize() + SInvalShmemSize(maxBackends);
#ifdef STABLE_MEMORY_STORAGE
size += MMShmemSize();
#endif
size += 100000;
/* might as well round it off to a multiple of a K or so... */
size += 1024 - (size % 1024);
/* might as well round it off to a multiple of a typical page size */
size += 8192 - (size % 8192);
if (DebugLvl > 1)
{
fprintf(stderr, "binding ShmemCreate(key=%x, size=%d)\n",
IPCKeyGetBufferMemoryKey(key), size);
}
ShmemCreate(IPCKeyGetBufferMemoryKey(key), size);
ShmemIndexReset();
InitShmem(key, size);
XLOGShmemInit();
InitBufferPool(key);
fprintf(stderr, "invoking IpcMemoryCreate(size=%d)\n", size);
/* ----------------
* do the lock table stuff
* ----------------
/*
* Create the shmem segment
*/
seghdr = IpcMemoryCreate(size, private, IPCProtection);
/*
* First initialize spinlocks --- needed by InitShmemAllocation()
*/
CreateSpinlocks(seghdr);
/*
* Set up shmem.c hashtable
*/
InitShmemAllocation(seghdr);
/*
* Set up xlog and buffers
*/
XLOGShmemInit();
InitBufferPool();
/*
* Set up lock manager
*/
InitLocks();
if (InitLockTable() == INVALID_TABLEID)
elog(FATAL, "Couldn't create the lock table");
/* ----------------
* do process table stuff
* ----------------
/*
* Set up process table
*/
InitProcGlobal(key, maxBackends);
InitProcGlobal(maxBackends);
CreateSharedInvalidationState(key, maxBackends);
}
/*
* AttachSharedMemoryAndSemaphores
* Attachs existant shared memory and semaphores.
*/
void
AttachSharedMemoryAndSemaphores(IPCKey key)
{
/* ----------------
* create rather than attach if using private key
* ----------------
*/
if (key == PrivateIPCKey)
{
CreateSharedMemoryAndSemaphores(key, 16);
return;
}
#ifdef HAS_TEST_AND_SET
/* ----------------
* attach the slock shared memory
* ----------------
*/
AttachSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
#endif
/* ----------------
* attach the buffer manager buffer pool (and semaphore)
* ----------------
*/
InitShmem(key, 0);
InitBufferPool(key);
/* ----------------
* initialize lock table stuff
* ----------------
*/
InitLocks();
if (InitLockTable() == INVALID_TABLEID)
elog(FATAL, "Couldn't attach to the lock table");
AttachSharedInvalidationState(key);
/*
* Set up shared-inval messaging
*/
CreateSharedInvalidationState(maxBackends);
}