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/*-------------------------------------------------------------------------
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*
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* sem.h
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* System V Semaphore Emulation
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*
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* Copyright (c) 1999, repas AEG Automation GmbH
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/include/port/darwin/Attic/sem.h,v 1.6 2001/11/08 20:37:52 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef _SYS_SEM_H
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#define _SYS_SEM_H
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/* #define DEBUG_IPC here if you want to see the shim in action */
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#include <sys/ipc.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/*
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* Semctl Command Definitions.
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*/
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#define GETNCNT 3 /* get semncnt */
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#define GETPID 4 /* get sempid */
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#define GETVAL 5 /* get semval */
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#define GETALL 6 /* get all semval's */
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#define GETZCNT 7 /* get semzcnt */
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#define SETVAL 8 /* set semval */
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#define SETALL 9 /* set all semval's */
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#ifndef ushort_t
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#define ushort_t unsigned int
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#endif
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/*
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* There is one semaphore structure for each semaphore in the system.
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*/
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struct sem
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{
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ushort_t semval; /* semaphore text map address */
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pid_t sempid; /* pid of last operation */
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ushort_t semncnt; /* # awaiting semval > cval */
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ushort_t semzcnt; /* # awaiting semval = 0 */
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};
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/*
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* User semaphore template for semop system calls.
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*/
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struct sembuf
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{
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ushort_t sem_num; /* semaphore # */
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short sem_op; /* semaphore operation */
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short sem_flg; /* operation flags */
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};
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extern int semctl(int semid, int semnum, int cmd, /* ... */ union semun arg);
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extern int semget(key_t key, int nsems, int semflg);
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extern int semop(int semid, struct sembuf * sops, size_t nsops);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_SEM_H */
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