Postgres95 1.01 Distribution - Virgin Sources

2025-11-12 05:01:15 +03:00 · 1996-07-09 06:22:35 +00:00
commit d31084e9d1
868 changed files with 242656 additions and 0 deletions
--- a/src/backend/storage/proc.h
+++ b/src/backend/storage/proc.h
@@ -0,0 +1,127 @@
+/*-------------------------------------------------------------------------
+ *
+ * proc.h--
+ *    
+ *
+ *
+ * Copyright (c) 1994, Regents of the University of California
+ *
+ * $Id: proc.h,v 1.1.1.1 1996/07/09 06:21:53 scrappy Exp $
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef _PROC_H_
+#define _PROC_H_
+
+#include "storage/ipc.h"
+#include "storage/lock.h"
+#ifndef WIN32
+#include <sys/sem.h>
+#else
+/* This is because WIN32 already defines PROC */
+#define PROC	PGL_PROC
+#endif /* WIN32 */
+#include "storage/shmem.h"
+
+
+typedef struct {
+  int	 		sleeplock;
+  int			semNum;
+  IpcSemaphoreId	semId;
+  IpcSemaphoreKey	semKey;
+} SEMA;
+
+/*
+ * Each backend has:
+ */
+typedef struct proc {
+
+  /* proc->links MUST BE THE FIRST ELEMENT OF STRUCT (see ProcWakeup()) */
+
+  SHM_QUEUE         links;	/* proc can be waiting for one event(lock) */
+  SEMA              sem;	/* ONE semaphore to sleep on */
+  int               errType; 	/* error code tells why we woke up */
+
+  int               procId;  	/* unique number for this structure
+			 	 * NOT unique per backend, these things
+				 * are reused after the backend dies.
+				 */
+
+  int               critSects;	/* If critSects > 0, we are in sensitive
+				 * routines that cannot be recovered when
+				 * the process fails.
+				 */
+
+  int               prio;	/* priority for sleep queue */
+
+  TransactionId     xid;	/* transaction currently being executed
+				 * by this proc
+				 */
+
+  LOCK *            waitLock;	/* Lock we're sleeping on */
+  int               token;	/* info for proc wakeup routines */	
+  int		    pid;	/* This procs process id */
+  short		    sLocks[MAX_SPINS];	/* Spin lock stats */
+  SHM_QUEUE	    lockQueue;	/* locks associated with current transaction */
+} PROC;
+
+
+/*
+ * MAX_PROC_SEMS is the maximum number of per-process semaphores (those used
+ * by the lock mgr) we can keep track of. PROC_NSEMS_PER_SET is the number
+ * of semaphores in each (sys-V) semaphore set allocated. (Be careful not
+ * to set it to greater 32. Otherwise, the bitmap will overflow.)
+ */
+#define  MAX_PROC_SEMS		128
+#define  PROC_NSEMS_PER_SET	16
+
+typedef struct procglobal {
+    SHMEM_OFFSET	freeProcs;
+    int			numProcs;
+    IPCKey		currKey;
+    int32		freeSemMap[MAX_PROC_SEMS/PROC_NSEMS_PER_SET];
+} PROC_HDR;
+
+extern PROC *MyProc;
+
+#define PROC_INCR_SLOCK(lock) if (MyProc) (MyProc->sLocks[(lock)])++
+#define PROC_DECR_SLOCK(lock) if (MyProc) (MyProc->sLocks[(lock)])--
+
+/*
+ * flags explaining why process woke up
+ */
+#define NO_ERROR 	0
+#define ERR_TIMEOUT	1
+#define ERR_BUFFER_IO	2
+
+#define MAX_PRIO	50
+#define MIN_PRIO	(-1)
+
+extern SPINLOCK ProcStructLock;
+
+/*
+ * Function Prototypes
+ */
+extern void InitProcess(IPCKey key);
+extern void ProcReleaseLocks(void);
+extern bool ProcRemove(int pid);
+/* extern bool ProcKill(int exitStatus, int pid); */
+/* make static in storage/lmgr/proc.c -- jolly */
+
+extern PROC_QUEUE *ProcQueueAlloc(char *name);
+extern void ProcQueueInit(PROC_QUEUE *queue);
+extern int ProcSleep(PROC_QUEUE *queue, SPINLOCK spinlock, int token, 
+	      int prio, LOCK *lock);
+extern PROC *ProcWakeup(PROC *proc, int errType);
+extern int ProcGetId(void);
+extern int ProcLockWakeup(PROC_QUEUE *queue, char * ltable, char * lock);
+extern void ProcAddLock(SHM_QUEUE *elem);
+#if defined(PORTNAME_linux)
+extern int HandleDeadLock(int);
+#else
+extern int HandleDeadLock(void);
+#endif
+extern void ProcReleaseSpins(PROC *proc);
+extern void ProcFreeAllSemaphores(void);
+
+#endif /* PROC_H */