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, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, 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 #define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
  49
  50 static inline void
  51 __gthread_mutex_init_function (__gthread_mutex_t *mutex)
  52 {
  53   *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
  54 }
  55
  56 static inline int
  57 __gthread_mutex_lock (__gthread_mutex_t *mutex)
  58 {
  59   return semTake (*mutex, WAIT_FOREVER);
  60 }
  61
  62 static inline int
  63 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
  64 {
  65   return semTake (*mutex, NO_WAIT);
  66 }
  67
  68 static inline int
  69 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
  70 {
  71   return semGive (*mutex);
  72 }
  73
  74 /* pthread_once is complicated enough that it's implemented
  75    out-of-line.  See config/vxlib.c.  */
  76
  77 typedef struct
  78 {
  79   volatile unsigned char busy;
  80   volatile unsigned char done;
  81 }
  82 __gthread_once_t;
  83
  84 #define __GTHREAD_ONCE_INIT { 0, 0 }
  85
  86 extern int __gthread_once (__gthread_once_t *once, void (*func)(void));
  87
  88 /* Thread-specific data requires a great deal of effort, since VxWorks
  89    is not really set up for it.  See config/vxlib.c for the gory
  90    details.  All the TSD routines are sufficiently complex that they
  91    need to be implemented out of line.  */
  92
  93 typedef unsigned int __gthread_key_t;
  94
  95 extern int __gthread_key_create (__gthread_key_t *keyp, void (*dtor)(void *));
  96 extern int __gthread_key_delete (__gthread_key_t key);
  97
  98 extern void *__gthread_getspecific (__gthread_key_t key);
  99 extern int __gthread_setspecific (__gthread_key_t key, void *ptr);
 100
 101 #endif /* not _LIBOBJC */
 102
 103 #endif /* gthr-vxworks.h */