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@@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/shmem.c,v 1.30 1998/09/01 03:25:11 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/shmem.c,v 1.31 1998/09/01 04:31:49 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@@ -76,7 +76,7 @@ unsigned long ShmemBase = 0; /* start and end address of shared memory */
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static unsigned long ShmemEnd = 0;
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static unsigned long ShmemSize = 0; /* current size (and default) */
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extern VariableCache ShmemVariableCache; /* varsup.c */
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extern VariableCache ShmemVariableCache; /* varsup.c */
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SPINLOCK ShmemLock; /* lock for shared memory allocation */
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@@ -85,8 +85,9 @@ SPINLOCK ShmemIndexLock; /* lock for shmem index access */
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static unsigned long *ShmemFreeStart = NULL; /* pointer to the OFFSET
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* of first free shared
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* memory */
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static unsigned long *ShmemIndexOffset = NULL; /* start of the shmem index
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* table (for bootstrap) */
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static unsigned long *ShmemIndexOffset = NULL; /* start of the shmem
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* index table (for
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* bootstrap) */
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static int ShmemBootstrap = FALSE; /* flag becomes true when shared
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* mem is created by POSTMASTER */
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@@ -155,6 +156,7 @@ InitShmem(unsigned int key, unsigned int size)
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item;
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bool found;
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IpcMemoryId shmid;
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/* if zero key, use default memory size */
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if (size)
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ShmemSize = size;
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@@ -204,7 +206,7 @@ InitShmem(unsigned int key, unsigned int size)
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if (ShmemBootstrap)
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{
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*ShmemFreeStart = currFreeSpace;
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memset (ShmemVariableCache, 0, sizeof(*ShmemVariableCache));
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memset(ShmemVariableCache, 0, sizeof(*ShmemVariableCache));
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}
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/* if ShmemFreeStart is NULL, then the allocator won't work */
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@@ -217,8 +219,8 @@ InitShmem(unsigned int key, unsigned int size)
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/* This will acquire the shmem index lock, but not release it. */
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ShmemIndex = ShmemInitHash("ShmemIndex",
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SHMEM_INDEX_SIZE, SHMEM_INDEX_SIZE,
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&info, hash_flags);
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SHMEM_INDEX_SIZE, SHMEM_INDEX_SIZE,
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&info, hash_flags);
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if (!ShmemIndex)
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{
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@@ -248,8 +250,7 @@ InitShmem(unsigned int key, unsigned int size)
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{
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/*
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* bootstrapping shmem: we have to initialize the shmem index
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* now.
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* bootstrapping shmem: we have to initialize the shmem index now.
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*/
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Assert(ShmemBootstrap);
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@@ -501,14 +502,16 @@ ShmemInitStruct(char *name, unsigned long size, bool *foundPtr)
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{
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#ifdef USE_ASSERT_CHECKING
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char *strname = "ShmemIndex";
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#endif
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/*
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* If the shmem index doesnt exist, we fake it.
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*
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* If we are creating the first shmem index, then let shmemalloc()
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* allocate the space for a new HTAB. Otherwise, find the old one
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* and return that. Notice that the ShmemIndexLock is held until the
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* shmem index has been completely initialized.
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* and return that. Notice that the ShmemIndexLock is held until
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* the shmem index has been completely initialized.
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*/
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Assert(!strcmp(name, strname));
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if (ShmemBootstrap)
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@@ -545,6 +548,7 @@ ShmemInitStruct(char *name, unsigned long size, bool *foundPtr)
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}
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else if (*foundPtr)
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{
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/*
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* Structure is in the shmem index so someone else has allocated
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* it already. The size better be the same as the size we are
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@@ -634,23 +638,23 @@ TransactionIdIsInProgress(TransactionId xid)
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* placed in array. Current xact ID are never placed there (just
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* to reduce its length, xmin/xmax may be equal to cid).
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* MyProc->xmin will be setted if equal to InvalidTransactionId.
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*
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*
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* Yet another strange func for this place... - vadim 07/21/98
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*/
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Snapshot
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GetSnapshotData(bool serialized)
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{
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Snapshot snapshot = (Snapshot) malloc(sizeof(SnapshotData));
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TransactionId snapshot->xip = (TransactionId*)
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malloc(32 * sizeof(TransactionId));
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ShmemIndexEnt *result;
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PROC *proc;
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TransactionId cid = GetCurrentTransactionId();
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uint count = 0;
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unit free = 31;
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Snapshot snapshot = (Snapshot) malloc(sizeof(SnapshotData));
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TransactionId snapshot->xip = (TransactionId *)
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malloc(32 * sizeof(TransactionId));
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ShmemIndexEnt *result;
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PROC *proc;
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TransactionId cid = GetCurrentTransactionId();
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uint count = 0;
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unit free = 31;
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Assert(ShmemIndex);
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snapshot->xmax = cid;
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snapshot->xmin = cid;
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@@ -672,7 +676,7 @@ GetSnapshotData(bool serialized)
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continue;
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proc = (PROC *) MAKE_PTR(result->location);
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if (proc == MyProc || proc->xid < FirstTransactionId ||
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serialized && proc->xid >= cid)
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serialized && proc->xid >= cid)
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continue;
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if (proc->xid < snapshot->xmin)
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snapshot->xmin = proc->xid;
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@@ -680,8 +684,8 @@ GetSnapshotData(bool serialized)
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snapshot->xmax = proc->xid;
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if (free == 0)
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{
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snapshot->xip = (TransactionId*) realloc(snapshot->xip,
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(count + 33) * sizeof(TransactionId));
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snapshot->xip = (TransactionId *) realloc(snapshot->xip,
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(count + 33) * sizeof(TransactionId));
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free = 32;
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}
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snapshot->xip[count] = proc->xid;
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@@ -695,4 +699,5 @@ GetSnapshotData(bool serialized)
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elog(ERROR, "GetSnapshotData: ShmemIndex corrupted");
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return NULL;
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}
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#endif
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