sem.h revision 2836
1168404Spjd/* $Id: sem.h,v 1.1 1994/09/13 14:47:35 dfr Exp $ */ 2168404Spjd/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ 3168404Spjd 4168404Spjd/* 5185029Spjd * SVID compatible sem.h file 6185029Spjd * 7168404Spjd * Author: Daniel Boulet 8168404Spjd */ 9168404Spjd 10168404Spjd#ifndef _SYS_SEM_H_ 11168404Spjd#define _SYS_SEM_H_ 12168404Spjd 13168404Spjd#include <sys/ipc.h> 14168404Spjd 15168404Spjdstruct sem { 16168404Spjd u_short semval; /* semaphore value */ 17168404Spjd pid_t sempid; /* pid of last operation */ 18168404Spjd u_short semncnt; /* # awaiting semval > cval */ 19168404Spjd u_short semzcnt; /* # awaiting semval = 0 */ 20168404Spjd}; 21185029Spjd 22168404Spjdstruct semid_ds { 23297542Smav struct ipc_perm sem_perm; /* operation permission struct */ 24219089Spjd struct sem *sem_base; /* pointer to first semaphore in set */ 25168404Spjd u_short sem_nsems; /* number of sems in set */ 26168404Spjd time_t sem_otime; /* last operation time */ 27168404Spjd long sem_pad1; /* SVABI/386 says I need this here */ 28168404Spjd time_t sem_ctime; /* last change time */ 29168404Spjd /* Times measured in secs since */ 30168404Spjd /* 00:00:00 GMT, Jan. 1, 1970 */ 31168404Spjd long sem_pad2; /* SVABI/386 says I need this here */ 32168404Spjd long sem_pad3[4]; /* SVABI/386 says I need this here */ 33168404Spjd}; 34168404Spjd 35168404Spjd/* 36168404Spjd * semop's sops parameter structure 37168404Spjd */ 38168404Spjdstruct sembuf { 39168404Spjd u_short sem_num; /* semaphore # */ 40168404Spjd short sem_op; /* semaphore operation */ 41168404Spjd short sem_flg; /* operation flags */ 42168404Spjd}; 43168404Spjd#define SEM_UNDO 010000 44168404Spjd 45168404Spjd#define MAX_SOPS 5 /* maximum # of sembuf's per semop call */ 46168404Spjd 47168404Spjd/* 48168404Spjd * semctl's arg parameter structure 49168404Spjd */ 50168404Spjdunion semun { 51168404Spjd int val; /* value for SETVAL */ 52168404Spjd struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ 53168404Spjd u_short *array; /* array for GETALL & SETALL */ 54168404Spjd}; 55168404Spjd 56168404Spjd/* 57168404Spjd * commands for semctl 58168404Spjd */ 59168404Spjd#define GETNCNT 3 /* Return the value of semncnt {READ} */ 60168404Spjd#define GETPID 4 /* Return the value of sempid {READ} */ 61168404Spjd#define GETVAL 5 /* Return the value of semval {READ} */ 62168404Spjd#define GETALL 6 /* Return semvals into arg.array {READ} */ 63168404Spjd#define GETZCNT 7 /* Return the value of semzcnt {READ} */ 64168404Spjd#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ 65168404Spjd#define SETALL 9 /* Set semvals from arg.array {ALTER} */ 66168404Spjd 67168404Spjd#ifdef KERNEL 68168404Spjd/* 69168404Spjd * Kernel implementation stuff 70168404Spjd */ 71168404Spjd#define SEMVMX 32767 /* semaphore maximum value */ 72168404Spjd#define SEMAEM 16384 /* adjust on exit max value */ 73168404Spjd 74168404Spjd/* 75168404Spjd * Permissions 76168404Spjd */ 77168404Spjd#define SEM_A 0200 /* alter permission */ 78168404Spjd#define SEM_R 0400 /* read permission */ 79168404Spjd 80168404Spjd/* 81168404Spjd * Undo structure (one per process) 82185029Spjd */ 83168404Spjdstruct sem_undo { 84168404Spjd struct sem_undo *un_next; /* ptr to next active undo structure */ 85185029Spjd struct proc *un_proc; /* owner of this structure */ 86185029Spjd short un_cnt; /* # of active entries */ 87185029Spjd struct undo { 88168404Spjd short un_adjval; /* adjust on exit values */ 89168404Spjd short un_num; /* semaphore # */ 90168404Spjd int un_id; /* semid */ 91168404Spjd } un_ent[1]; /* undo entries */ 92168404Spjd}; 93168404Spjd 94168404Spjd/* 95168404Spjd * semaphore info struct 96168404Spjd */ 97168404Spjdstruct seminfo { 98168404Spjd int semmap, /* # of entries in semaphore map */ 99168404Spjd semmni, /* # of semaphore identifiers */ 100168404Spjd semmns, /* # of semaphores in system */ 101168404Spjd semmnu, /* # of undo structures in system */ 102168404Spjd semmsl, /* max # of semaphores per id */ 103168404Spjd semopm, /* max # of operations per semop call */ 104168404Spjd semume, /* max # of undo entries per process */ 105168404Spjd semusz, /* size in bytes of undo structure */ 106168404Spjd semvmx, /* semaphore maximum value */ 107168404Spjd semaem; /* adjust on exit max value */ 108168404Spjd}; 109168404Spjdextern struct seminfo seminfo; 110168404Spjd 111185029Spjd/* internal "mode" bits */ 112168404Spjd#define SEM_ALLOC 01000 /* semaphore is allocated */ 113168404Spjd#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ 114168404Spjd 115168404Spjd/* 116168404Spjd * Configuration parameters 117168404Spjd */ 118168404Spjd#ifndef SEMMNI 119168404Spjd#define SEMMNI 10 /* # of semaphore identifiers */ 120168404Spjd#endif 121168404Spjd#ifndef SEMMNS 122168404Spjd#define SEMMNS 60 /* # of semaphores in system */ 123168404Spjd#endif 124168404Spjd#ifndef SEMUME 125168404Spjd#define SEMUME 10 /* max # of undo entries per process */ 126168404Spjd#endif 127168404Spjd#ifndef SEMMNU 128168404Spjd#define SEMMNU 30 /* # of undo structures in system */ 129168404Spjd#endif 130168404Spjd 131168404Spjd/* shouldn't need tuning */ 132168404Spjd#ifndef SEMMAP 133168404Spjd#define SEMMAP 30 /* # of entries in semaphore map */ 134168404Spjd#endif 135168404Spjd#ifndef SEMMSL 136168404Spjd#define SEMMSL SEMMNS /* max # of semaphores per id */ 137168404Spjd#endif 138168404Spjd#ifndef SEMOPM 139168404Spjd#define SEMOPM 100 /* max # of operations per semop call */ 140168404Spjd#endif 141168404Spjd 142168404Spjd/* actual size of an undo structure */ 143168404Spjd#define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME) 144168404Spjd 145168404Spjd/* 146168404Spjd * Structures allocated in machdep.c 147168404Spjd */ 148168404Spjdstruct semid_ds *sema; /* semaphore id pool */ 149168404Spjdstruct sem *sem; /* semaphore pool */ 150168404Spjdstruct map *semmap; /* semaphore allocation map */ 151168404Spjdstruct sem_undo *semu_list; /* list of active undo structures */ 152168404Spjdint *semu; /* undo structure pool */ 153168404Spjd 154168404Spjd/* 155168404Spjd * Macro to find a particular sem_undo vector 156168404Spjd */ 157168404Spjd#define SEMU(ix) ((struct sem_undo *)(((long)semu)+ix * SEMUSZ)) 158168404Spjd 159168404Spjd/* 160168404Spjd * Parameters to the semconfig system call 161168404Spjd */ 162168404Spjdtypedef enum { 163168404Spjd SEM_CONFIG_FREEZE, /* Freeze the semaphore facility. */ 164168404Spjd SEM_CONFIG_THAW /* Thaw the semaphore facility. */ 165168404Spjd} semconfig_ctl_t; 166168404Spjd#endif /* KERNEL */ 167168404Spjd 168168404Spjd#ifndef KERNEL 169168404Spjd#include <sys/cdefs.h> 170168404Spjd 171168404Spjd__BEGIN_DECLS 172168404Spjdint semsys __P((int, ...)); 173168404Spjdint semctl __P((int, int, int, union semun)); 174168404Spjdint semget __P((key_t, int, int)); 175168404Spjdint semop __P((int, struct sembuf *,unsigned)); 176168404Spjd__END_DECLS 177168404Spjd#endif /* !KERNEL */ 178168404Spjd 179168404Spjd#endif /* !_SEM_H_ */ 180168404Spjd