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 $ */
5 * SVID compatible sem.h file
7 * Author: Daniel Boulet
13 #include <sys/cdefs.h>
15 #include <machine/stdint.h>
17 #ifndef _PID_T_DECLARED
18 typedef __pid_t pid_t;
19 #define _PID_T_DECLARED
22 #ifndef _SIZE_T_DECLARED
23 typedef __size_t size_t;
24 #define _SIZE_T_DECLARED
27 #ifndef _TIME_T_DECLARED
28 typedef __time_t time_t;
29 #define _TIME_T_DECLARED
35 struct ipc_perm sem_perm; /* operation permission struct */
36 struct sem *sem_base; /* pointer to first semaphore in set */
37 unsigned short sem_nsems; /* number of sems in set */
38 time_t sem_otime; /* last operation time */
39 long sem_pad1; /* SVABI/386 says I need this here */
40 time_t sem_ctime; /* last change time */
41 /* Times measured in secs since */
42 /* 00:00:00 GMT, Jan. 1, 1970 */
43 long sem_pad2; /* SVABI/386 says I need this here */
44 long sem_pad3[4]; /* SVABI/386 says I need this here */
47 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
60 * semop's sops parameter structure
63 unsigned short sem_num; /* semaphore # */
64 short sem_op; /* semaphore operation */
65 short sem_flg; /* operation flags */
67 #define SEM_UNDO 010000
70 #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
73 * semctl's arg parameter structure
76 int val; /* value for SETVAL */
77 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
78 unsigned short *array; /* array for GETALL & SETALL */
80 #endif /* __BSD_VISIBLE */
85 #define GETNCNT 3 /* Return the value of semncnt {READ} */
86 #define GETPID 4 /* Return the value of sempid {READ} */
87 #define GETVAL 5 /* Return the value of semval {READ} */
88 #define GETALL 6 /* Return semvals into arg.array {READ} */
89 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
90 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
91 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
93 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
98 #define SEM_A 0200 /* alter permission */
99 #define SEM_R 0400 /* read permission */
100 #endif /* __BSD_VISIBLE */
102 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
105 * semaphore info struct
108 int semmap, /* # of entries in semaphore map */
109 semmni, /* # of semaphore identifiers */
110 semmns, /* # of semaphores in system */
111 semmnu, /* # of undo structures in system */
112 semmsl, /* max # of semaphores per id */
113 semopm, /* max # of operations per semop call */
114 semume, /* max # of undo entries per process */
115 semusz, /* size in bytes of undo structure */
116 semvmx, /* semaphore maximum value */
117 semaem; /* adjust on exit max value */
120 /* internal "mode" bits */
121 #define SEM_ALLOC 01000 /* semaphore is allocated */
122 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
124 #endif /* _KERNEL || _KERNEL_STRUCTURES */
128 * Process sem_undo vectors at proc exit.
130 void semexit(struct proc *p);
131 extern struct seminfo seminfo;
134 int semctl(int, int, int, ...);
135 int semget(key_t, int, int);
136 int semop(int, struct sembuf *, unsigned);
138 #endif /* !_KERNEL */
140 #endif /* !_SEM_H_ */