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/*-------------------------------------------------------------------------
*
* proc.h--
*
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: proc.h,v 1.11 1998/02/26 04:43:31 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef _PROC_H_
#define _PROC_H_
#include <storage/lock.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 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;
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 void ProcQueueInit(PROC_QUEUE *queue);
extern int
ProcSleep(PROC_QUEUE *queue, SPINLOCK spinlock, int token,
int prio, LOCK *lock);
extern int ProcLockWakeup(PROC_QUEUE *queue, char *ltable, char *lock);
extern void ProcAddLock(SHM_QUEUE *elem);
extern void ProcReleaseSpins(PROC *proc);
extern void ProcFreeAllSemaphores(void);
#endif /* PROC_H */
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