gcc/gthr-gnat.c

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 2003, 2004, 2009 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 #include "gthr-gnat.h"
  27
  28 #ifndef HIDE_EXPORTS
  29 #pragma GCC visibility push(default)
  30 #endif
  31
  32 #ifdef __cplusplus
  33 #define UNUSED(x)
  34 #else
  35 #define UNUSED(x) x __attribute__((unused))
  36 #endif
  37
  38 void __gnat_default_lock (void);
  39 void __gnat_default_unlock (void);
  40
  41 void
  42 __gnat_default_lock (void)
  43 {
  44   return;
  45 }
  46
  47 void
  48 __gnat_default_unlock (void)
  49 {
  50   return;
  51 }
  52
  53 static void (*__gnat_task_lock) (void) = *__gnat_default_lock;
  54 static void (*__gnat_task_unlock) (void) = *__gnat_default_unlock;
  55
  56  void
  57 __gnat_install_locks (void (*lock) (void), void (*unlock) (void))
  58 {
  59   __gnat_task_lock = lock;
  60   __gnat_task_unlock = unlock;
  61 }
  62
  63 int
  64 __gthread_active_p (void)
  65 {
  66   return 0;
  67 }
  68
  69 int
  70 __gthread_mutex_lock (__gthread_mutex_t * UNUSED (mutex))
  71 {
  72   __gnat_task_lock ();
  73   return 0;
  74 }
  75
  76 int
  77 __gthread_mutex_unlock (__gthread_mutex_t * UNUSED (mutex))
  78 {
  79   __gnat_task_unlock ();
  80   return 0;
  81 }
  82
  83 #ifndef HIDE_EXPORTS
  84 #pragma GCC visibility pop
  85 #endif