124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* proc.h--
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*
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*
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: proc.h,v 1.1 1996/08/28 01:58:24 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _PROC_H_
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#define _PROC_H_
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#include "storage/ipc.h"
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#include "storage/lock.h"
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#ifndef WIN32
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#include <sys/sem.h>
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#else
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/* This is because WIN32 already defines PROC */
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#define PROC PGL_PROC
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#endif /* WIN32 */
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#include "storage/shmem.h"
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typedef struct {
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int sleeplock;
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int semNum;
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IpcSemaphoreId semId;
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IpcSemaphoreKey semKey;
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} SEMA;
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/*
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* Each backend has:
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*/
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typedef struct proc {
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/* proc->links MUST BE THE FIRST ELEMENT OF STRUCT (see ProcWakeup()) */
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SHM_QUEUE links; /* proc can be waiting for one event(lock) */
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SEMA sem; /* ONE semaphore to sleep on */
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int errType; /* error code tells why we woke up */
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int procId; /* unique number for this structure
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* NOT unique per backend, these things
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* are reused after the backend dies.
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*/
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int critSects; /* If critSects > 0, we are in sensitive
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* routines that cannot be recovered when
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* the process fails.
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*/
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int prio; /* priority for sleep queue */
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TransactionId xid; /* transaction currently being executed
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* by this proc
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*/
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LOCK * waitLock; /* Lock we're sleeping on */
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int token; /* info for proc wakeup routines */
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int pid; /* This procs process id */
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short sLocks[MAX_SPINS]; /* Spin lock stats */
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SHM_QUEUE lockQueue; /* locks associated with current transaction */
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} PROC;
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/*
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* MAX_PROC_SEMS is the maximum number of per-process semaphores (those used
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* by the lock mgr) we can keep track of. PROC_NSEMS_PER_SET is the number
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* of semaphores in each (sys-V) semaphore set allocated. (Be careful not
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* to set it to greater 32. Otherwise, the bitmap will overflow.)
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*/
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#define MAX_PROC_SEMS 128
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#define PROC_NSEMS_PER_SET 16
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typedef struct procglobal {
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SHMEM_OFFSET freeProcs;
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int numProcs;
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IPCKey currKey;
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int32 freeSemMap[MAX_PROC_SEMS/PROC_NSEMS_PER_SET];
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} PROC_HDR;
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extern PROC *MyProc;
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#define PROC_INCR_SLOCK(lock) if (MyProc) (MyProc->sLocks[(lock)])++
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#define PROC_DECR_SLOCK(lock) if (MyProc) (MyProc->sLocks[(lock)])--
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/*
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* flags explaining why process woke up
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*/
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#define NO_ERROR 0
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#define ERR_TIMEOUT 1
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#define ERR_BUFFER_IO 2
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#define MAX_PRIO 50
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#define MIN_PRIO (-1)
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extern SPINLOCK ProcStructLock;
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/*
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* Function Prototypes
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*/
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extern void InitProcess(IPCKey key);
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extern void ProcReleaseLocks(void);
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extern bool ProcRemove(int pid);
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/* extern bool ProcKill(int exitStatus, int pid); */
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/* make static in storage/lmgr/proc.c -- jolly */
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extern PROC_QUEUE *ProcQueueAlloc(char *name);
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extern void ProcQueueInit(PROC_QUEUE *queue);
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extern int ProcSleep(PROC_QUEUE *queue, SPINLOCK spinlock, int token,
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int prio, LOCK *lock);
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extern PROC *ProcWakeup(PROC *proc, int errType);
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extern int ProcGetId(void);
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extern int ProcLockWakeup(PROC_QUEUE *queue, char * ltable, char * lock);
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extern void ProcAddLock(SHM_QUEUE *elem);
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extern void HandleDeadLock(int sig);
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extern void ProcReleaseSpins(PROC *proc);
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extern void ProcFreeAllSemaphores(void);
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#endif /* PROC_H */
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