gcc/gthr-gnat.c

   1 /* Threads compatibility routines for libgcc2.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 2003 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 2, 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 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING.  If not, write to the Free
  19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  20 02111-1307, USA.  */
  21
  22 /* As a special exception, if you link this library with other files,
  23    some of which are compiled with GCC, to produce an executable,
  24    this library does not by itself cause the resulting executable
  25    to be covered by the GNU General Public License.
  26    This exception does not however invalidate any other reasons why
  27    the executable file might be covered by the GNU General Public License.  */
  28
  29 #include "gthr-gnat.h"
  30
  31 #pragma GCC visibility push(default)
  32
  33 #ifdef __cplusplus
  34 #define UNUSED(x)
  35 #else
  36 #define UNUSED(x) x __attribute__((unused))
  37 #endif
  38
  39 void __gnat_default_lock (void);
  40 void __gnat_default_unlock (void);
  41
  42 void
  43 __gnat_default_lock (void)
  44 {
  45   return;
  46 }
  47
  48 void
  49 __gnat_default_unlock (void)
  50 {
  51   return;
  52 }
  53
  54 static void (*__gnat_task_lock) (void) = *__gnat_default_lock;
  55 static void (*__gnat_task_unlock) (void) = *__gnat_default_unlock;
  56
  57  void
  58 __gnat_install_locks (void (*lock) (void), void (*unlock) (void))
  59 {
  60   __gnat_task_lock = lock;
  61   __gnat_task_unlock = unlock;
  62 }
  63
  64 int
  65 __gthread_active_p (void)
  66 {
  67   return 0;
  68 }
  69
  70 int
  71 __gthread_mutex_lock (__gthread_mutex_t * UNUSED (mutex))
  72 {
  73   __gnat_task_lock ();
  74   return 0;
  75 }
  76
  77 int
  78 __gthread_mutex_unlock (__gthread_mutex_t * UNUSED (mutex))
  79 {
  80   __gnat_task_unlock ();
  81   return 0;
  82 }
  83
  84 #pragma GCC visibility pop