1 /* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */
2 /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
5 *© Portions copyright (c) 2006 Nokia Corporation. All rights reserved.
6 *© Portions copyright (c) 2006 Symbian Software Ltd. All rights reserved.
7 * SVID compatible sem.h file
9 * Author: Daniel Boulet
19 u_short semval; /* semaphore value */
20 pid_t sempid; /* process ID of last operation */
21 u_short semncnt; /* number of processes waiting for semval
22 to become greater than current value */
23 u_short semzcnt; /* number of processes waiting for semval
28 struct ipc_perm sem_perm; /* operation permission struct */
29 struct sem *sem_base; /* pointer to first semaphore in set */
30 unsigned short sem_nsems; /* number of sems in set */
31 time_t sem_otime; /* last operation time */
32 long sem_pad1; /* SVABI/386 says I need this here */
33 time_t sem_ctime; /* last change time */
34 /* Times measured in secs since */
35 /* 00:00:00 GMT, Jan. 1, 1970 */
36 long sem_pad2; /* SVABI/386 says I need this here */
37 long sem_pad3[4]; /* SVABI/386 says I need this here */
41 * semop's sops parameter structure
44 unsigned short sem_num; /* semaphore # */
45 short sem_op; /* semaphore operation */
46 short sem_flg; /* operation flags */
48 #define SEM_UNDO 010000
51 * semctl's arg parameter structure
54 int val; /* value for SETVAL */
55 struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
56 unsigned short *array; /* array for GETALL & SETALL */
62 #define GETNCNT 3 /* Return the value of semncnt {READ} */
63 #define GETPID 4 /* Return the value of sempid {READ} */
64 #define GETVAL 5 /* Return the value of semval {READ} */
65 #define GETALL 6 /* Return semvals into arg.array {READ} */
66 #define GETZCNT 7 /* Return the value of semzcnt {READ} */
67 #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
68 #define SETALL 9 /* Set semvals from arg.array {ALTER} */
69 #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */
70 #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */
75 #define SEM_A IPC_W /* alter permission */
76 #define SEM_R IPC_R /* read permission */
81 * semaphore info struct
84 int semmap, /* # of entries in semaphore map */
85 semmni, /* # of semaphore identifiers */
86 semmns, /* # of semaphores in system */
87 semmnu, /* # of undo structures in system */
88 semmsl, /* max # of semaphores per id */
89 semopm, /* max # of operations per semop call */
90 semume, /* max # of undo entries per process */
91 semusz, /* size in bytes of undo structure */
92 semvmx, /* semaphore maximum value */
93 semaem; /* adjust on exit max value */
95 extern struct seminfo seminfo;
98 * Kernel wrapper for the user-level structure
100 struct semid_kernel {
102 struct label *label; /* MAC framework label */
105 /* internal "mode" bits */
106 #define SEM_ALLOC 01000 /* semaphore is allocated */
107 #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
110 * Process sem_undo vectors at proc exit.
112 void semexit(struct proc *p);
116 #include <sys/cdefs.h>
117 #include <sys/_types.h>
119 #ifndef _SIZE_T_DECLARED
120 typedef __size_t size_t;
121 #define _SIZE_T_DECLARED
124 #ifndef _PID_T_DECLARED
125 typedef __pid_t pid_t;
126 #define _PID_T_DECLARED
129 // FUNCTION PROTOTYPES
132 // FORWARD DECLARATIONS
135 // CLASS/STRUCT/FUNCTION DECLARATION
140 * Get semaphore identifier using the IPC key generated by ftok.
143 IMPORT_C int semget(key_t key, int nsems, int semflg);
147 * Perform atomically a user-defined array of semaphore operations on the set of
148 * semaphores associated with the semaphore identifier specified by the argument semid.
151 IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops);
155 * Provides a variety of semaphore control operations as specified by cmd.
157 IMPORT_C int semctl(int semid, int semnum, int cmd, ...);
161 #endif // #ifndef _KERNEL
163 #endif // _SYS_SEM_H_