git://sourceware.org / newlib-cygwin.git / blame
| Commit | Line | Data |
|---|---|---|
| 1c001dd2 CS |
1 | /* sys/sem.h |
| 2 | ||
| 3 | Copyright 2002 Red Hat Inc. | |
| 4 | Written by Conrad Scott <conrad.scott@dsl.pipex.com> | |
| 5 | ||
| 6 | This file is part of Cygwin. | |
| 7 | ||
| 8 | This software is a copyrighted work licensed under the terms of the | |
| 9 | Cygwin license. Please consult the file "CYGWIN_LICENSE" for | |
| 10 | details. */ | |
| 11 | ||
| 12 | #ifndef _SYS_SEM_H | |
| 13 | #define _SYS_SEM_H | |
| 14 | ||
| 15 | #include <cygwin/ipc.h> | |
| 16 | ||
| 17 | #ifdef __cplusplus | |
| 18 | extern "C" | |
| 19 | { | |
| 20 | #endif | |
| 21 | ||
| 22 | /* Semaphore operation flags: | |
| 23 | */ | |
| 24 | #define SEM_UNDO /* Set up adjust on exit entry. */ | |
| 25 | ||
| 26 | /* Command definitions for the semctl () function: | |
| 27 | */ | |
| 28 | #define GETNCNT 0x3000 /* Get semncnt. */ | |
| 29 | #define GETPID 0x3001 /* Get sempid. */ | |
| 30 | #define GETVAL 0x3002 /* Get semval. */ | |
| 31 | #define GETALL 0x3003 /* Get all cases of semval. */ | |
| 32 | #define GETZCNT 0x3004 /* Get semzcnt. */ | |
| 33 | #define SETVAL 0x3005 /* Set semval. */ | |
| 34 | #define SETALL 0x3006 /* Set all cases of semval. */ | |
| 35 | ||
| 36 | #define SEM_STAT 0x3010 /* For ipcs(8). */ | |
| 37 | #define SEM_INFO 0x3011 /* For ipcs(8). */ | |
| 38 | ||
| 39 | struct semid_ds | |
| 40 | { | |
| 41 | struct ipc_perm sem_perm; /* Operation permission structure. */ | |
| 42 | unsigned short sem_nsems; /* Number of semaphores in set. */ | |
| 43 | timestruc_t sem_otim; /* Last semop () time. */ | |
| 44 | timestruc_t sem_ctim; /* Last time changed by semctl (). */ | |
| 45 | long sem_spare4[2]; | |
| 46 | }; | |
| 47 | ||
| 48 | #define sem_otime sem_otim.tv_sec | |
| 49 | #define sem_ctime sem_ctim.tv_sec | |
| 50 | ||
| 51 | struct sembuf | |
| 52 | { | |
| 53 | unsigned short sem_num; /* Semaphore number. */ | |
| 54 | short sem_op; /* Semaphore operation. */ | |
| 55 | short sem_flg; /* Operation flags. */ | |
| 56 | }; | |
| 57 | ||
| 58 | /* Buffer type for semctl (IPC_INFO, ...) as used by ipcs(8). | |
| 59 | */ | |
| 60 | struct seminfo | |
| 61 | { | |
| 62 | unsigned long semmni; /* Maximum number of unique semaphore | |
| 63 | sets, system wide. */ | |
| 64 | unsigned long semmns; /* Maximum number of semaphores, | |
| 65 | system wide. */ | |
| 66 | unsigned long semmsl; /* Maximum number of semaphores per | |
| 67 | semaphore set. */ | |
| 68 | unsigned long semopm; /* Maximum number of operations per | |
| 69 | semop call. */ | |
| 70 | unsigned long semmnu; /* Maximum number of undo structures, | |
| 71 | system wide. */ | |
| 72 | unsigned long semume; /* Maximum number of undo entries per | |
| 73 | undo structure. */ | |
| 74 | unsigned long semvmx; /* Maximum semaphore value. */ | |
| 75 | unsigned long semaem; /* Maximum adjust-on-exit value. */ | |
| 76 | unsigned long sem_spare[4]; | |
| 77 | }; | |
| 78 | ||
| 79 | /* Buffer type for semctl (SEM_INFO, ...) as used by ipcs(8). | |
| 80 | */ | |
| 81 | struct sem_info | |
| 82 | { | |
| 83 | unsigned long sem_ids; /* Number of allocated semaphore sets. */ | |
| 84 | unsigned long sem_num; /* Number of allocated semaphores. */ | |
| 85 | }; | |
| 86 | ||
| 87 | int semctl (int semid, int semnum, int cmd, ...); | |
| 88 | int semget (key_t key, int nsems, int semflg); | |
| 89 | int semop (int semid, struct sembuf *sops, size_t nsops); | |
| 90 | ||
| 91 | #ifdef __cplusplus | |
| 92 | } | |
| 93 | #endif | |
| 94 | ||
| 95 | #endif /* _SYS_SEM_H */ |