1 /* $FreeBSD: src/sys/sys/sem.h,v 1.20.2.2 2000/08/04 22:31:10 peter Exp $ */ 2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 3 4 /* 5 * SVID compatible sem.h file 6 * 7 * Author: Daniel Boulet 8 */ 9 10 #ifndef _SYS_SEM_H_ 11 #define _SYS_SEM_H_ 12 13 #include <sys/ipc.h> 14 15 struct sem; 16 17 struct semid_ds { 18 struct ipc_perm sem_perm; /* operation permission struct */ 19 struct sem *sem_base; /* pointer to first semaphore in set */ 20 u_short sem_nsems; /* number of sems in set */ 21 time_t sem_otime; /* last operation time */ 22 long sem_pad1; /* SVABI/386 says I need this here */ 23 time_t sem_ctime; /* last change time */ 24 /* Times measured in secs since */ 25 /* 00:00:00 GMT, Jan. 1, 1970 */ 26 long sem_pad2; /* SVABI/386 says I need this here */ 27 long sem_pad3[4]; /* SVABI/386 says I need this here */ 28 }; 29 30 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 31 32 #include <sys/lock.h> 33 34 struct semid_pool { 35 struct lock lk; 36 struct semid_ds ds; 37 long gen; 38 }; 39 40 #endif 41 42 /* 43 * semop's sops parameter structure 44 */ 45 struct sembuf { 46 u_short sem_num; /* semaphore # */ 47 short sem_op; /* semaphore operation */ 48 short sem_flg; /* operation flags */ 49 }; 50 #define SEM_UNDO 010000 51 52 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 53 54 /* 55 * semctl's arg parameter structure 56 */ 57 union semun { 58 int val; /* value for SETVAL */ 59 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 60 u_short *array; /* array for GETALL & SETALL */ 61 }; 62 63 /* 64 * commands for semctl 65 */ 66 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 67 #define GETPID 4 /* Return the value of sempid {READ} */ 68 #define GETVAL 5 /* Return the value of semval {READ} */ 69 #define GETALL 6 /* Return semvals into arg.array {READ} */ 70 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 71 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 72 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 73 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ 74 75 /* 76 * Permissions 77 */ 78 #define SEM_A 0200 /* alter permission */ 79 #define SEM_R 0400 /* read permission */ 80 81 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES) 82 83 /* 84 * semaphore info struct 85 */ 86 struct seminfo { 87 int semmap, /* # of entries in semaphore map */ 88 semmni, /* # of semaphore identifiers */ 89 semmns, /* # of semaphores in system */ 90 semmnu, /* # of undo structures in system */ 91 semmsl, /* max # of semaphores per id */ 92 semopm, /* max # of operations per semop call */ 93 semume, /* max # of undo entries per process */ 94 semusz, /* size in bytes of undo structure */ 95 semvmx, /* semaphore maximum value */ 96 semaem; /* adjust on exit max value */ 97 }; 98 99 /* internal "mode" bits */ 100 #define SEM_ALLOC 01000 /* semaphore is allocated */ 101 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 102 103 #endif /* _KERNEL || _KERNEL_STRUCTURES */ 104 105 #ifdef _KERNEL 106 107 /* 108 * Process sem_undo vectors at proc exit. 109 */ 110 void semexit (struct proc *p); 111 extern struct seminfo seminfo; 112 113 #endif 114 115 #ifndef _KERNEL 116 #include <sys/cdefs.h> 117 118 __BEGIN_DECLS 119 int semctl (int, int, int, ...); 120 int semget (key_t, int, int); 121 int semop (int, struct sembuf *,unsigned); 122 __END_DECLS 123 #endif /* !_KERNEL */ 124 125 #endif /* !_SEM_H_ */ 126