gcc/gthr-vxworks.h

   1 /* Threads compatibility routines for libgcc2 for VxWorks.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1997 Free Software Foundation, Inc.
   4    Contributed by Mike Stump <mrs@wrs.com>.
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 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 __gthr_vxworks_h
  31 #define __gthr_vxworks_h
  32
  33 /* POSIX threads specific definitions.
  34    Easy, since the interface is just one-to-one mapping. */
  35
  36 #define __GTHREADS 1
  37
  38 #include <vxWorks.h>
  39 #include <semLib.h>
  40 /* typedef void *SEM_ID; */
  41
  42 typedef int __gthread_key_t;
  43 typedef char __gthread_once_t;
  44 typedef SEM_ID __gthread_mutex_t;
  45
  46 #define __GTHREAD_MUTEX_INIT 0
  47 #define __GTHREAD_ONCE_INIT 0
  48
  49 #ifndef REG_SAVED_REG
  50 static inline int
  51 __gthread_once (__gthread_once_t *once, void (*func) (void))
  52 {
  53   (*func)();
  54   return 0;
  55 }
  56
  57 extern __gthread_key_t eh_context_key;
  58
  59 /* This is not the right way to do it, but the semantic of pthreads
  60    don't map well enough onto VxWorks.  */
  61
  62 static void
  63 __ehdtor (void *pTcb)
  64 {
  65   int tid = (int) pTcb;
  66   void *p = (void*)taskVarGet(tid, &eh_context_key);
  67   if (p != (void*)-1)
  68     {
  69       if (p)
  70         free (p);
  71       taskVarSet(tid, &eh_context_key, 0);
  72     }
  73 }
  74
  75 /* This only works for the code in libgcc2.c.  */
  76
  77 static inline int
  78 __gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
  79 {
  80   *key = 0;
  81
  82   /* Do this first so that the task variables are visible during the
  83      running of the delete hook.  */
  84
  85   taskVarInit();
  86
  87   /* We don't have a way to track dtor here, so instead, we
  88      register a generic routine that can cleanup any task.  */
  89
  90   taskDeleteHookAdd (__ehdtor);
  91
  92   return 0;
  93 }
  94
  95 #define __gthread_setspecific(key, ptr) \
  96   (key = (int) ptr, 0)
  97
  98 static inline int
  99 __gthread_key_dtor (__gthread_key_t key, void *ptr)
 100 {
 101   /* Just reset the key value to zero. */
 102   if (ptr)
 103     return __gthread_setspecific (key, 0);
 104   else
 105     return 0;
 106 }
 107
 108 #define __gthread_key_delete(key) \
 109   taskVarDelete (taskIdSelf (), &key)
 110
 111 #define __gthread_getspecific(key)                      \
 112      ((key == 0)                                        \
 113       ? ((taskVarAdd (taskIdSelf (), &key) != OK)       \
 114          ? (__terminate (), (void*)0)                   \
 115          : (void*)0)                                    \
 116       : (void*)key)
 117 #endif
 118
 119 static inline int
 120 __gthread_mutex_lock (__gthread_mutex_t *mutex)
 121 {
 122   if (*mutex == 0)
 123     *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
 124   return semTake (*mutex, WAIT_FOREVER);
 125 }
 126
 127 static inline int
 128 __gthread_mutex_trylock (__gthread_mutex_t *mutex)
 129 {
 130   if (*mutex == 0)
 131     *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
 132   return semTake (*mutex, NO_WAIT);
 133 }
 134
 135 static inline int
 136 __gthread_mutex_unlock (__gthread_mutex_t *mutex)
 137 {
 138   /* We could return the */
 139   return semGive (*mutex);
 140 }
 141
 142 #endif /* not __gthr_vxworks_h */