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 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
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 #define __GTHREADS 1
  45 #define __gthread_active_p() 1
  46
  47 /* Mutexes are easy, except that they need to be initialized at runtime.  */
  48
  49 #include <semLib.h>
  50
  51 typedef SEM_ID __gthread_mutex_t;
  52 /* All VxWorks mutexes are recursive.  */
  53 typedef SEM_ID __gthread_recursive_mutex_t;
  54 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
  55 #define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
  56
  57 static inline void
  58 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
  59 {
  60   *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
  61 }
  62
  63 static inline int
  64 __gthread_mutex_lock (__gthread_mutex_t *mutex)
  65 {
  66   return semTake (*mutex, WAIT_FOREVER);
  67 }
  68
  69 static inline int
  70 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
  71 {
  72   return semTake (*mutex, NO_WAIT);
  73 }
  74
  75 static inline int
  76 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
  77 {
  78   return semGive (*mutex);
  79 }
  80
  81 static inline void
  82 __gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
  83 {
  84   __gthread_mutex_init_function (mutex);
  85 }
  86
  87 static inline int
  88 __gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
  89 {
  90   return __gthread_mutex_lock (mutex);
  91 }
  92
  93 static inline int
  94 __gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
  95 {
  96   return __gthread_mutex_trylock (mutex);
  97 }
  98
  99 static inline int
 100 __gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
 101 {
 102   return __gthread_mutex_unlock (mutex);
 103 }
 104
 105 /* pthread_once is complicated enough that it's implemented
 106    out-of-line.  See config/vxlib.c.  */
 107
 108 typedef struct
 109 {
 110 #ifndef __RTP__
 111   volatile unsigned char busy;
 112 #endif
 113   volatile unsigned char done;
 114 }
 115 __gthread_once_t;
 116
 117 #ifndef __RTP__
 118 # define __GTHREAD_ONCE_INIT { 0, 0 }
 119 #else
 120 # define __GTHREAD_ONCE_INIT { 0 }
 121 #endif
 122
 123 extern int __gthread_once (__gthread_once_t *once, void (*func)(void));
 124
 125 /* Thread-specific data requires a great deal of effort, since VxWorks
 126    is not really set up for it.  See config/vxlib.c for the gory
 127    details.  All the TSD routines are sufficiently complex that they
 128    need to be implemented out of line.  */
 129
 130 typedef unsigned int __gthread_key_t;
 131
 132 extern int __gthread_key_create (__gthread_key_t *keyp, void (*dtor)(void *));
 133 extern int __gthread_key_delete (__gthread_key_t key);
 134
 135 extern void *__gthread_getspecific (__gthread_key_t key);
 136 extern int __gthread_setspecific (__gthread_key_t key, void *ptr);
 137
 138 #ifdef __cplusplus
 139 }
 140 #endif
 141
 142 #endif /* not _LIBOBJC */
 143
 144 #endif /* gthr-vxworks.h */