564842a617
These are my last changes to lmgr fixing deadlock handling. Please apply them to cvs... Vadim
129 lines
3.5 KiB
C
129 lines
3.5 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 1.22 1999/05/13 15:55:45 momjian 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/lock.h>
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typedef struct
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{
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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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{
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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 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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int prio; /* priority for sleep queue */
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TransactionId xid; /* transaction currently being executed by
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* this proc */
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TransactionId xmin; /* minimal running XID as it was when we
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* were starting our xact: vacuum must not
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* remove tuples deleted by xid >= xmin ! */
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LOCK *waitLock; /* Lock we're sleeping on ... */
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int token; /* type of lock we sleeping for */
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int holdLock; /* while holding these locks */
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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
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* transaction */
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} PROC;
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/*
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* PROC_NSEMS_PER_SET is the number of semaphores in each sys-V semaphore set
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* we allocate. It must be *less than* 32 (or however many bits in an int
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* on your machine), or our free-semaphores bitmap won't work. You also must
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* not set it higher than your kernel's SEMMSL (max semaphores per set)
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* parameter, which is often around 25.
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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. It must be a multiple of
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* PROC_NSEMS_PER_SET.
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*/
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#define PROC_NSEMS_PER_SET 16
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#define MAX_PROC_SEMS (((MAXBACKENDS-1)/PROC_NSEMS_PER_SET+1)*PROC_NSEMS_PER_SET)
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typedef struct procglobal
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{
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SHMEM_OFFSET freeProcs;
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IPCKey currKey;
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int32 freeSemMap[MAX_PROC_SEMS / PROC_NSEMS_PER_SET];
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/* In each freeSemMap entry, the PROC_NSEMS_PER_SET lsbs flag whether
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* individual semaphores are in use, and the next higher bit is set to
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* show that the entire set is allocated.
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*/
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} PROC_HDR;
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extern PROC *MyProc;
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#define PROC_INCR_SLOCK(lock) \
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do { \
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if (MyProc) (MyProc->sLocks[(lock)])++; \
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} while (0)
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#define PROC_DECR_SLOCK(lock) \
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do { \
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if (MyProc) (MyProc->sLocks[(lock)])--; \
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} while (0)
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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 void ProcQueueInit(PROC_QUEUE *queue);
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extern int ProcSleep(PROC_QUEUE *queue, LOCKMETHODCTL *lockctl, int token,
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LOCK *lock);
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extern PROC *ProcWakeup(PROC *proc, int errType);
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extern int ProcLockWakeup(PROC_QUEUE *queue, LOCKMETHOD lockmethod,
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LOCK *lock);
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extern void ProcAddLock(SHM_QUEUE *elem);
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extern void ProcReleaseSpins(PROC *proc);
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#endif /* PROC_H */
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