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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */
23:
24: /*
25: * SVID compatible sem.h file
26: *
27: * Author: Daniel Boulet
28: */
29:
30: #ifndef _SYS_SEM_H_
31: #define _SYS_SEM_H_
32:
33: #include <sys/ipc.h>
34:
35: struct sem {
36: u_short semval; /* semaphore value */
37: pid_t sempid; /* pid of last operation */
38: u_short semncnt; /* # awaiting semval > cval */
39: u_short semzcnt; /* # awaiting semval = 0 */
40: };
41:
42: struct semid_ds {
43: struct ipc_perm sem_perm; /* operation permission struct */
44: struct sem *sem_base; /* pointer to first semaphore in set */
45: u_short sem_nsems; /* number of sems in set */
46: time_t sem_otime; /* last operation time */
47: long sem_pad1; /* SVABI/386 says I need this here */
48: time_t sem_ctime; /* last change time */
49: /* Times measured in secs since */
50: /* 00:00:00 GMT, Jan. 1, 1970 */
51: long sem_pad2; /* SVABI/386 says I need this here */
52: long sem_pad3[4]; /* SVABI/386 says I need this here */
53: };
54:
55: /*
56: * semop's sops parameter structure
57: */
58: struct sembuf {
59: u_short sem_num; /* semaphore # */
60: short sem_op; /* semaphore operation */
61: short sem_flg; /* operation flags */
62: };
63: #define SEM_UNDO 010000
64:
65: #define MAX_SOPS 5 /* maximum # of sembuf's per semop call */
66:
67: /*
68: * semctl's arg parameter structure
69: */
70: union semun {
71: int val; /* value for SETVAL */
72: struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
73: u_short *array; /* array for GETALL & SETALL */
74: };
75:
76: /*
77: * commands for semctl
78: */
79: #define GETNCNT 3 /* Return the value of semncnt {READ} */
80: #define GETPID 4 /* Return the value of sempid {READ} */
81: #define GETVAL 5 /* Return the value of semval {READ} */
82: #define GETALL 6 /* Return semvals into arg.array {READ} */
83: #define GETZCNT 7 /* Return the value of semzcnt {READ} */
84: #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */
85: #define SETALL 9 /* Set semvals from arg.array {ALTER} */
86:
87: /*
88: * Permissions
89: */
90: #define SEM_A 0200 /* alter permission */
91: #define SEM_R 0400 /* read permission */
92:
93: #ifdef KERNEL
94: /*
95: * Kernel implementation stuff
96: */
97: #define SEMVMX 32767 /* semaphore maximum value */
98: #define SEMAEM 16384 /* adjust on exit max value */
99:
100:
101: /*
102: * Undo structure (one per process)
103: */
104: struct sem_undo {
105: struct sem_undo *un_next; /* ptr to next active undo structure */
106: struct proc *un_proc; /* owner of this structure */
107: short un_cnt; /* # of active entries */
108: struct undo {
109: short un_adjval; /* adjust on exit values */
110: short un_num; /* semaphore # */
111: int un_id; /* semid */
112: } un_ent[1]; /* undo entries */
113: };
114:
115: /*
116: * semaphore info struct
117: */
118: struct seminfo {
119: int semmap, /* # of entries in semaphore map */
120: semmni, /* # of semaphore identifiers */
121: semmns, /* # of semaphores in system */
122: semmnu, /* # of undo structures in system */
123: semmsl, /* max # of semaphores per id */
124: semopm, /* max # of operations per semop call */
125: semume, /* max # of undo entries per process */
126: semusz, /* size in bytes of undo structure */
127: semvmx, /* semaphore maximum value */
128: semaem; /* adjust on exit max value */
129: };
130: extern struct seminfo seminfo;
131:
132: /* internal "mode" bits */
133: #define SEM_ALLOC 01000 /* semaphore is allocated */
134: #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */
135:
136: /*
137: * Configuration parameters
138: */
139: #ifndef SEMMNI
140: #define SEMMNI 10 /* # of semaphore identifiers */
141: #endif
142: #ifndef SEMMNS
143: #define SEMMNS 60 /* # of semaphores in system */
144: #endif
145: #ifndef SEMUME
146: #define SEMUME 10 /* max # of undo entries per process */
147: #endif
148: #ifndef SEMMNU
149: #define SEMMNU 30 /* # of undo structures in system */
150: #endif
151:
152: /* shouldn't need tuning */
153: #ifndef SEMMAP
154: #define SEMMAP 30 /* # of entries in semaphore map */
155: #endif
156: #ifndef SEMMSL
157: #define SEMMSL SEMMNS /* max # of semaphores per id */
158: #endif
159: #ifndef SEMOPM
160: #define SEMOPM 100 /* max # of operations per semop call */
161: #endif
162:
163: /*
164: * Due to the way semaphore memory is allocated, we have to ensure that
165: * SEMUSZ is properly aligned.
166: */
167:
168: #define SEM_ALIGN(bytes) (((bytes) + (sizeof(long) - 1)) & ~(sizeof(long) - 1))
169:
170: /* actual size of an undo structure */
171: #define SEMUSZ SEM_ALIGN(offsetof(struct sem_undo, un_ent[SEMUME]))
172:
173: extern struct semid_ds *sema; /* semaphore id pool */
174: extern struct sem *sem; /* semaphore pool */
175: extern int *semu; /* undo structure pool */
176:
177: /*
178: * Macro to find a particular sem_undo vector
179: */
180: #define SEMU(ix) ((struct sem_undo *)(((intptr_t)semu)+ix * seminfo.semusz))
181:
182: /*
183: * Process sem_undo vectors at proc exit.
184: */
185: void semexit __P((struct proc *p));
186:
187: /*
188: * Parameters to the semconfig system call
189: */
190: typedef enum {
191: SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */
192: SEM_CONFIG_THAW /* Thaw the semaphore facility. */
193: } semconfig_ctl_t;
194: #endif /* KERNEL */
195:
196: #ifndef KERNEL
197: #include <sys/cdefs.h>
198:
199: __BEGIN_DECLS
200: int semsys __P((int, ...));
201: int semctl __P((int, int, int, ...));
202: int semget __P((key_t, int, int));
203: int semop __P((int, struct sembuf *,unsigned));
204: __END_DECLS
205: #endif /* !KERNEL */
206:
207: #endif /* !_SEM_H_ */
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