1 /* $Id: sem.h,v 1.1 1994/09/13 14:47:35 dfr 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 u_short semval; /* semaphore value */ 17 pid_t sempid; /* pid of last operation */ 18 u_short semncnt; /* # awaiting semval > cval */ 19 u_short semzcnt; /* # awaiting semval = 0 */ 20 }; 21 22 struct semid_ds { 23 struct ipc_perm sem_perm; /* operation permission struct */ 24 struct sem *sem_base; /* pointer to first semaphore in set */ 25 u_short sem_nsems; /* number of sems in set */ 26 time_t sem_otime; /* last operation time */ 27 long sem_pad1; /* SVABI/386 says I need this here */ 28 time_t sem_ctime; /* last change time */ 29 /* Times measured in secs since */ 30 /* 00:00:00 GMT, Jan. 1, 1970 */ 31 long sem_pad2; /* SVABI/386 says I need this here */ 32 long sem_pad3[4]; /* SVABI/386 says I need this here */ 33 }; 34 35 /* 36 * semop's sops parameter structure 37 */ 38 struct sembuf { 39 u_short sem_num; /* semaphore # */ 40 short sem_op; /* semaphore operation */ 41 short sem_flg; /* operation flags */ 42 }; 43 #define SEM_UNDO 010000 44 45 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 46 47 /* 48 * semctl's arg parameter structure 49 */ 50 union semun { 51 int val; /* value for SETVAL */ 52 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 53 u_short *array; /* array for GETALL & SETALL */ 54 }; 55 56 /* 57 * commands for semctl 58 */ 59 #define GETNCNT 3 /* Return the value of semncnt {READ} */ 60 #define GETPID 4 /* Return the value of sempid {READ} */ 61 #define GETVAL 5 /* Return the value of semval {READ} */ 62 #define GETALL 6 /* Return semvals into arg.array {READ} */ 63 #define GETZCNT 7 /* Return the value of semzcnt {READ} */ 64 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 65 #define SETALL 9 /* Set semvals from arg.array {ALTER} */ 66 67 #ifdef KERNEL 68 /* 69 * Kernel implementation stuff 70 */ 71 #define SEMVMX 32767 /* semaphore maximum value */ 72 #define SEMAEM 16384 /* adjust on exit max value */ 73 74 /* 75 * Permissions 76 */ 77 #define SEM_A 0200 /* alter permission */ 78 #define SEM_R 0400 /* read permission */ 79 80 /* 81 * Undo structure (one per process) 82 */ 83 struct sem_undo { 84 struct sem_undo *un_next; /* ptr to next active undo structure */ 85 struct proc *un_proc; /* owner of this structure */ 86 short un_cnt; /* # of active entries */ 87 struct undo { 88 short un_adjval; /* adjust on exit values */ 89 short un_num; /* semaphore # */ 90 int un_id; /* semid */ 91 } un_ent[1]; /* undo entries */ 92 }; 93 94 /* 95 * semaphore info struct 96 */ 97 struct seminfo { 98 int semmap, /* # of entries in semaphore map */ 99 semmni, /* # of semaphore identifiers */ 100 semmns, /* # of semaphores in system */ 101 semmnu, /* # of undo structures in system */ 102 semmsl, /* max # of semaphores per id */ 103 semopm, /* max # of operations per semop call */ 104 semume, /* max # of undo entries per process */ 105 semusz, /* size in bytes of undo structure */ 106 semvmx, /* semaphore maximum value */ 107 semaem; /* adjust on exit max value */ 108 }; 109 extern struct seminfo seminfo; 110 111 /* internal "mode" bits */ 112 #define SEM_ALLOC 01000 /* semaphore is allocated */ 113 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 114 115 /* 116 * Configuration parameters 117 */ 118 #ifndef SEMMNI 119 #define SEMMNI 10 /* # of semaphore identifiers */ 120 #endif 121 #ifndef SEMMNS 122 #define SEMMNS 60 /* # of semaphores in system */ 123 #endif 124 #ifndef SEMUME 125 #define SEMUME 10 /* max # of undo entries per process */ 126 #endif 127 #ifndef SEMMNU 128 #define SEMMNU 30 /* # of undo structures in system */ 129 #endif 130 131 /* shouldn't need tuning */ 132 #ifndef SEMMAP 133 #define SEMMAP 30 /* # of entries in semaphore map */ 134 #endif 135 #ifndef SEMMSL 136 #define SEMMSL SEMMNS /* max # of semaphores per id */ 137 #endif 138 #ifndef SEMOPM 139 #define SEMOPM 100 /* max # of operations per semop call */ 140 #endif 141 142 /* actual size of an undo structure */ 143 #define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME) 144 145 /* 146 * Structures allocated in machdep.c 147 */ 148 struct semid_ds *sema; /* semaphore id pool */ 149 struct sem *sem; /* semaphore pool */ 150 struct map *semmap; /* semaphore allocation map */ 151 struct sem_undo *semu_list; /* list of active undo structures */ 152 int *semu; /* undo structure pool */ 153 154 /* 155 * Macro to find a particular sem_undo vector 156 */ 157 #define SEMU(ix) ((struct sem_undo *)(((long)semu)+ix * SEMUSZ)) 158 159 /* 160 * Parameters to the semconfig system call 161 */ 162 typedef enum { 163 SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */ 164 SEM_CONFIG_THAW /* Thaw the semaphore facility. */ 165 } semconfig_ctl_t; 166 #endif /* KERNEL */ 167 168 #ifndef KERNEL 169 #include <sys/cdefs.h> 170 171 __BEGIN_DECLS 172 int semsys __P((int, ...)); 173 int semctl __P((int, int, int, union semun)); 174 int semget __P((key_t, int, int)); 175 int semop __P((int, struct sembuf *,unsigned)); 176 __END_DECLS 177 #endif /* !KERNEL */ 178 179 #endif /* !_SEM_H_ */ 180