127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/* sys/sem.h
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Written by Conrad Scott <conrad.scott@dsl.pipex.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGWIN_SEM_H
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#define _CYGWIN_SEM_H
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#include <cygwin/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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/* Semaphore operation flags:
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*/
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#define SEM_UNDO 010000 /* Set up adjust on exit entry. */
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/* Command definitions for the semctl () function:
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*/
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#define GETNCNT 0x3000 /* Get semncnt. */
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#define GETPID 0x3001 /* Get sempid. */
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#define GETVAL 0x3002 /* Get semval. */
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#define GETALL 0x3003 /* Get all cases of semval. */
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#define GETZCNT 0x3004 /* Get semzcnt. */
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#define SETVAL 0x3005 /* Set semval. */
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#define SETALL 0x3006 /* Set all cases of semval. */
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#ifdef _KERNEL
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#define SEM_STAT 0x3010 /* For ipcs(8). */
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#define SEM_INFO 0x3011 /* For ipcs(8). */
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#endif /* _KERNEL */
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struct semid_ds
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{
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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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timestruc_t sem_otim; /* Last semop () time. */
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timestruc_t sem_ctim; /* Last time changed by semctl (). */
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#ifdef _KERNEL
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struct sem *sem_base; /* pointer to first semaphore in set */
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long sem_spare4[1];
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#else
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long sem_spare4[2];
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#endif /* _KERNEL */
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};
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#define sem_otime sem_otim.tv_sec
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#define sem_ctime sem_ctim.tv_sec
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struct sembuf
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{
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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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#ifdef _KERNEL
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/* Buffer type for semctl (IPC_INFO, ...) as used by ipcs(8).
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*/
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struct seminfo
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{
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int32_t semmni; /* Maximum number of unique semaphore
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sets, system wide. */
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int32_t semmns; /* Maximum number of semaphores,
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system wide. */
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int32_t semmsl; /* Maximum number of semaphores per
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semaphore set. */
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int32_t semopm; /* Maximum number of operations per
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semop call. */
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int32_t semmnu; /* Maximum number of undo structures,
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system wide. */
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int32_t semume; /* Maximum number of undo entries per
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undo structure. */
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int32_t semvmx; /* Maximum semaphore value. */
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int32_t semaem; /* Maximum adjust-on-exit value. */
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int32_t semmap; /* # of entries in semaphore map */
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int32_t semusz; /* size in bytes of undo structure */
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int32_t sem_spare[2];
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};
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/* Buffer type for semctl (SEM_INFO, ...) as used by ipcs(8).
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*/
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struct sem_info
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{
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long sem_ids; /* Number of allocated semaphore sets. */
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long sem_num; /* Number of allocated semaphores. */
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};
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/* Permission flags */
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#define SEM_A IPC_W /* alter permission */
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#define SEM_R IPC_R /* read permission */
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/* Internally used mode bits. */
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#define SEM_ALLOC 01000 /* semaphore is allocated */
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#endif /* _KERNEL */
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#ifdef _KERNEL
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/* According to SUSv3, "the fourth argument [to semctl()] is optional and
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depends upon the operation requested. If required, it is of type
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union semun, which the application shall explicitly declare:" */
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union semun {
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int val; /* value for SETVAL */
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struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */
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unsigned short *array; /* array for GETALL, SETALL */
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};
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/* Therefore this union is only declared here if building internal code.
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_KERNEL must not be defined in exernal applications! Declare union
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semun explicitely as required by SUSv3, please. */
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#endif /* _KERNEL */
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int semctl (int semid, int semnum, int cmd, ...);
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int semget (key_t key, int nsems, int semflg);
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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 /* _CYGWIN_SEM_H */
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