Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01

1 files changed, 149 insertions, 0 deletions

diff --git a/src/backend/storage/ipc/ipci.c b/src/backend/storage/ipc/ipci.c
new file mode 100644
index 00000000000..18d3cccd0ee
--- /dev/null
+++ b/src/backend/storage/ipc/ipci.c
@@ -0,0 +1,149 @@
+/*-------------------------------------------------------------------------
+ *
+ * ipci.c--
+ *    POSTGRES inter-process communication initialization code.
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *    $Header: /cvsroot/pgsql/src/backend/storage/ipc/ipci.c,v 1.1.1.1 1996/07/09 06:21:54 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "c.h"
+
+#include "storage/ipc.h"
+#include "storage/multilev.h"
+#include "utils/elog.h"
+#include "storage/sinval.h"
+#include "storage/bufmgr.h"
+#include "storage/proc.h"
+#include "storage/smgr.h"
+#include "storage/lock.h"
+#include "miscadmin.h"		/* for DebugLvl */
+
+/*
+ * 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.
+ */
+/**************************************************
+  
+  CreateSharedMemoryAndSemaphores
+  is called exactly *ONCE* by the postmaster.
+  It is *NEVER* called by the postgres backend
+  
+  0) destroy any existing semaphores for both buffer
+  and lock managers.
+  1) create the appropriate *SHARED* memory segments
+  for the two resource managers.
+  
+  **************************************************/
+
+void
+CreateSharedMemoryAndSemaphores(IPCKey key)
+{
+    int		size;
+    
+#ifdef HAS_TEST_AND_SET
+    /* ---------------
+     *  create shared memory for slocks
+     * --------------
+     */
+    CreateAndInitSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
+#endif
+    /* ----------------
+     *	kill and create the buffer manager buffer pool (and semaphore)
+     * ----------------
+     */
+    CreateSpinlocks(IPCKeyGetSpinLockSemaphoreKey(key));
+    size = BufferShmemSize() + LockShmemSize();
+    
+#ifdef MAIN_MEMORY
+    size += MMShmemSize();
+#endif /* MAIN_MEMORY */
+    
+    if (DebugLvl > 1) {
+	fprintf(stderr, "binding ShmemCreate(key=%x, size=%d)\n",
+		IPCKeyGetBufferMemoryKey(key), size);
+    }
+    ShmemCreate(IPCKeyGetBufferMemoryKey(key), size);
+    ShmemBindingTabReset();
+    InitShmem(key, size);
+    InitBufferPool(key);
+    
+    /* ----------------
+     *	do the lock table stuff
+     * ----------------
+     */
+    InitLocks();
+    InitMultiLevelLockm();
+    if (InitMultiLevelLockm() == INVALID_TABLEID)
+	elog(FATAL, "Couldn't create the lock table");
+
+    /* ----------------
+     *  do process table stuff
+     * ----------------
+     */
+    InitProcGlobal(key);
+    on_exitpg(ProcFreeAllSemaphores, 0);
+    
+    CreateSharedInvalidationState(key);
+}
+
+
+/*
+ * AttachSharedMemoryAndSemaphores --
+ *	Attachs existant shared memory and semaphores.
+ */
+void
+AttachSharedMemoryAndSemaphores(IPCKey key)
+{
+    int size;
+    
+    /* ----------------
+     *	create rather than attach if using private key
+     * ----------------
+     */
+    if (key == PrivateIPCKey) {
+	CreateSharedMemoryAndSemaphores(key);
+	return;
+    }
+    
+#ifdef HAS_TEST_AND_SET
+    /* ----------------
+     *  attach the slock shared memory
+     * ----------------
+     */
+    AttachSLockMemory(IPCKeyGetSLockSharedMemoryKey(key));
+#endif
+    /* ----------------
+     *	attach the buffer manager buffer pool (and semaphore)
+     * ----------------
+     */
+    size = BufferShmemSize() + LockShmemSize();
+    InitShmem(key, size);
+    InitBufferPool(key);
+    
+    /* ----------------
+     *	initialize lock table stuff
+     * ----------------
+     */
+    InitLocks();
+    if (InitMultiLevelLockm() == INVALID_TABLEID)
+	elog(FATAL, "Couldn't attach to the lock table");
+    
+    AttachSharedInvalidationState(key);
+}