include/posix/semaphore.h

   1 /*
   2  * Copyright (C) 2005 Philippe Gerum <rpm@xenomai.org>.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 of the
   7  * License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #ifndef _XENO_POSIX_SEMAPHORE_H
  20 #define _XENO_POSIX_SEMAPHORE_H
  21
  22 #if defined(__KERNEL__) || defined(__XENO_SIM__)
  23
  24 #include <nucleus/xenomai.h>
  25
  26 #ifdef __KERNEL__
  27 #include <linux/kernel.h>
  28 #include <linux/fcntl.h>
  29 #endif /* __KERNEL__ */
  30
  31 #ifdef __XENO_SIM__
  32 #include <posix_overrides.h>
  33 #endif /* __XENO_SIM__ */
  34
  35 #define SEM_VALUE_MAX (INT_MAX)
  36 #define SEM_FAILED    NULL
  37
  38 #ifdef __KERNEL__
  39 /* Copied from Linuxthreads semaphore.h. */
  40 struct _sem_fastlock
  41 {
  42   long int __status;
  43   int __spinlock;
  44 };
  45
  46 typedef struct
  47 {
  48   struct _sem_fastlock __sem_lock;
  49   int __sem_value;
  50   long __sem_waiting;
  51 } sem_t;
  52 #endif /* __KERNEL__ */
  53
  54 #else /* !(__KERNEL__ || __XENO_SIM__) */
  55
  56 #pragma GCC system_header
  57
  58 #include <fcntl.h>              /* For sem_open flags. */
  59 #include_next <semaphore.h>
  60
  61 #endif /* !(__KERNEL__ || __XENO_SIM__) */
  62
  63 struct pse51_sem;
  64
  65 union __xeno_sem {
  66     sem_t native_sem;
  67     struct __shadow_sem {
  68         unsigned magic;
  69         struct pse51_sem *sem;
  70     } shadow_sem;
  71 };
  72
  73 #if defined(__KERNEL__) || defined(__XENO_SIM__)
  74
  75 #ifdef __cplusplus
  76 extern "C" {
  77 #endif
  78
  79 #undef sem_init
  80 #define sem_init pse51_sem_init
  81
  82 int pse51_sem_init(sem_t *sem,
  83                    int pshared,
  84                    unsigned int value);
  85
  86 int sem_destroy(sem_t *sem);
  87
  88 int sem_post(sem_t *sem);
  89
  90 int sem_trywait(sem_t *sem);
  91
  92 int sem_wait(sem_t *sem);
  93
  94 int sem_timedwait(sem_t *sem,
  95                   const struct timespec *abs_timeout);
  96
  97 int sem_getvalue(sem_t *sem,
  98                  int *value);
  99
 100 sem_t *sem_open(const char *name, int oflag, ...);
 101
 102 int sem_close(sem_t *sem);
 103
 104 int sem_unlink(const char *name);
 105
 106 #ifdef __cplusplus
 107 }
 108 #endif
 109
 110 #else /* !(__KERNEL__ || __XENO_SIM__) */
 111
 112 #ifdef __cplusplus
 113 extern "C" {
 114 #endif
 115
 116 int __real_sem_init(sem_t *sem,
 117                     int pshared,
 118                     unsigned value);
 119
 120 int __real_sem_destroy(sem_t *sem);
 121
 122 int __real_sem_post(sem_t *sem);
 123
 124 int __real_sem_wait(sem_t *sem);
 125
 126 int __real_sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
 127
 128 int __real_sem_trywait(sem_t *sem);
 129
 130 int __real_sem_getvalue(sem_t *sem, int *value);
 131
 132 sem_t *__real_sem_open(const char *name, int oflags, ...);
 133
 134 int __real_sem_close(sem_t *sem);
 135
 136 int __real_sem_unlink(const char *name);
 137
 138 #ifdef __cplusplus
 139 }
 140 #endif
 141
 142 #endif /* !(__KERNEL__ || __XENO_SIM__) */
 143
 144 #endif /* _XENO_POSIX_SEMAPHORE_H */