rossubsys/posix/include/sys/sem.h

   1 /* $Id: sem.h,v 1.5 2002/10/29 04:45:21 rex Exp $
   2  */
   3 /*
   4  * sys/sem.h
   5  *
   6  * semaphore facility. Conforming to the Single UNIX(r) Specification
   7  * Version 2, System Interface & Headers Issue 5
   8  *
   9  * This file is part of the ReactOS Operating System.
  10  *
  11  * Contributors:
  12  *  Created by KJK::Hyperion <noog@libero.it>
  13  *
  14  *  THIS SOFTWARE IS NOT COPYRIGHTED
  15  *
  16  *  This source code is offered for use in the public domain. You may
  17  *  use, modify or distribute it freely.
  18  *
  19  *  This code is distributed in the hope that it will be useful but
  20  *  WITHOUT ANY WARRANTY. ALL WARRANTIES, EXPRESS OR IMPLIED ARE HEREBY
  21  *  DISCLAMED. This includes but is not limited to warranties of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  23  *
  24  */
  25 #ifndef __SYS_SEM_H_INCLUDED__
  26 #define __SYS_SEM_H_INCLUDED__
  27
  28 /* INCLUDES */
  29 #include <sys/ipc.h>
  30
  31 /* OBJECTS */
  32
  33 /* TYPES */
  34 struct semid_ds
  35 {
  36  struct ipc_perm    sem_perm;  /* operation permission structure */
  37  unsigned short int sem_nsems; /* number of semaphores in set */
  38  time_t             sem_otime; /* last semop time */
  39  time_t             sem_ctime; /* last time changed by semctl() */
  40 };
  41
  42 struct sembuf
  43 {
  44  unsigned short int sem_num; /* semaphore number */
  45  short int          sem_op;  /* semaphore operation */
  46  short int          sem_flg; /* operation flags */
  47 };
  48
  49 /* CONSTANTS */
  50 /* Semaphore operation flags */
  51 #define SEM_UNDO (0x00001000) /* Set up adjust on exit entry */
  52
  53 /* Command definitions for the function semctl() */
  54 #define GETNCNT (1) /* Get semncnt */
  55 #define GETPID  (2) /* Get sempid */
  56 #define GETVAL  (3) /* Get semval */
  57 #define GETALL  (4) /* Get all cases of semval */
  58 #define GETZCNT (5) /* Get semzcnt */
  59 #define SETVAL  (6) /* Set semval */
  60 #define SETALL  (7) /* Set all cases of semval */
  61
  62 /* PROTOTYPES */
  63 int   semctl(int, int, int, ...);
  64 int   semget(key_t, int, int);
  65 int   semop(int, struct sembuf *, size_t);
  66
  67 /* MACROS */
  68
  69 #endif /* __SYS_SEM_H_INCLUDED__ */
  70
  71 /* EOF */
  72