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