66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
/*
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* Copyright 2008-2012 Haiku, Inc. All Rights Reserved.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SYS_SEM_H
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#define _SYS_SEM_H
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#include <sys/cdefs.h>
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#include <sys/ipc.h>
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#include <sys/types.h>
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/* Semaphore operation flags */
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#define SEM_UNDO 10
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/* Command definition for semctl */
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#define GETPID 3 /* Get process ID of last element manipulating */
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#define GETVAL 4 /* Get semval */
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#define GETALL 5 /* Get all semval */
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#define GETNCNT 6 /* Get semncnt */
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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 */
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struct semid_ds {
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struct ipc_perm sem_perm; /* Operation permission structure */
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unsigned short sem_nsems; /* Number of semaphores in set */
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time_t sem_otime; /* Last semop */
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time_t sem_ctime; /* Last time changed by semctl */
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};
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/* Structure passed as parameter to the semop function */
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struct sembuf {
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unsigned short sem_num; /* Semaphore number */
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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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/*
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* Semaphore info structure. Useful for the ipcs
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* standard utily
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*/
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struct seminfo {
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int semmni; /* Number of semaphore identifies */
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int semmns; /* Number of semaphore in system */
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int semmnu; /* Number of undo structures in system */
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int semmsl; /* Max number of semaphores per id */
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int semopm; /* Max number of operations per semop call */
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int semume; /* Max number of undo entries per process */
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int semusz; /* Size in bytes of undo structure */
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int semvmx; /* Semaphore maximum valure */
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int semaem; /* adjust on exit max value */
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};
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__BEGIN_DECLS
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int semctl(int semID, int semNum, int command, ...);
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int semget(key_t key, int numSems, int semFlags);
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int semop(int semID, struct sembuf *semOps, size_t numSemOps);
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__END_DECLS
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#endif /* _SYS_SEM_H */
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