gcc/gthr-vxworks.h

   1 /* Threads compatibility routines for libgcc2 and libobjc for VxWorks.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997, 1999, 2000, 2008, 2009 Free Software Foundation, Inc.
   4    Contributed by Mike Stump <mrs@wrs.com>.
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  21 02110-1301, USA.  */
  22
  23 /* As a special exception, if you link this library with other files,
  24    some of which are compiled with GCC, to produce an executable,
  25    this library does not by itself cause the resulting executable
  26    to be covered by the GNU General Public License.
  27    This exception does not however invalidate any other reasons why
  28    the executable file might be covered by the GNU General Public License.  */
  29
  30 #ifndef GCC_GTHR_VXWORKS_H
  31 #define GCC_GTHR_VXWORKS_H
  32
  33 #ifdef _LIBOBJC
  34
  35 /* libobjc requires the optional pthreads component.  */
  36 #include "gthr-posix.h"
  37
  38 #else
  39 #ifdef __cplusplus
  40 #define UNUSED(x)
  41 #else
  42 #define UNUSED(x) x __attribute__((unused))
  43 #endif
  44
  45 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 #define __GTHREADS 1
  50 #define __gthread_active_p() 1
  51
  52 /* Mutexes are easy, except that they need to be initialized at runtime.  */
  53
  54 #include <semLib.h>
  55
  56 typedef SEM_ID __gthread_mutex_t;
  57 /* All VxWorks mutexes are recursive.  */
  58 typedef SEM_ID __gthread_recursive_mutex_t;
  59 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
  60 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  61
  62 static inline void
  63 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
  64 {
  65   *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
  66 }
  67
  68 static inline int
  69 __gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
  70 {
  71   return 0;
  72 }
  73
  74 static inline int
  75 __gthread_mutex_lock (__gthread_mutex_t *mutex)
  76 {
  77   return semTake (*mutex, WAIT_FOREVER);
  78 }
  79
  80 static inline int
  81 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
  82 {
  83   return semTake (*mutex, NO_WAIT);
  84 }
  85
  86 static inline int
  87 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
  88 {
  89   return semGive (*mutex);
  90 }
  91
  92 static inline void
  93 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
  94 {
  95   __gthread_mutex_init_function (mutex);
  96 }
  97
  98 static inline int
  99 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
 100 {
 101   return __gthread_mutex_lock (mutex);
 102 }
 103
 104 static inline int
 105 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
 106 {
 107   return __gthread_mutex_trylock (mutex);
 108 }
 109
 110 static inline int
 111 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 112 {
 113   return __gthread_mutex_unlock (mutex);
 114 }
 115
 116 /* pthread_once is complicated enough that it's implemented
 117    out-of-line.  See config/vxlib.c.  */
 118
 119 typedef struct
 120 {
 121 #ifndef __RTP__
 122   volatile unsigned char busy;
 123 #endif
 124   volatile unsigned char done;
 125 }
 126 __gthread_once_t;
 127
 128 #ifndef __RTP__
 129 # define __GTHREAD_ONCE_INIT { 0, 0 }
 130 #else
 131 # define __GTHREAD_ONCE_INIT { 0 }
 132 #endif
 133
 134 extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
 135
 136 /* Thread-specific data requires a great deal of effort, since VxWorks
 137    is not really set up for it.  See config/vxlib.c for the gory
 138    details.  All the TSD routines are sufficiently complex that they
 139    need to be implemented out of line.  */
 140
 141 typedef unsigned int __gthread_key_t;
 142
 143 extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
 144 extern int __gthread_key_delete (__gthread_key_t __key);
 145
 146 extern void *__gthread_getspecific (__gthread_key_t __key);
 147 extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
 148
 149 #undef UNUSED
 150
 151 #ifdef __cplusplus
 152 }
 153 #endif
 154
 155 #endif /* not _LIBOBJC */
 156
 157 #endif /* gthr-vxworks.h */