gthr-posix.h   [plain text]

/* Threads compatibily routines for libgcc2.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1997 Free Software Foundation, Inc.

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

/* As a special exception, if you link this library with other files,
   some of which are compiled with GCC, to produce an executable,
   this library does not by itself cause the resulting executable
   to be covered by the GNU General Public License.
   This exception does not however invalidate any other reasons why
   the executable file might be covered by the GNU General Public License.  */

#ifndef __gthr_posix_h
#define __gthr_posix_h

/* POSIX threads specific definitions.
   Easy, since the interface is just one-to-one mapping. */

#define __GTHREADS 1

#include <pthread.h>

typedef pthread_key_t __gthread_key_t;
typedef pthread_once_t __gthread_once_t;
typedef pthread_mutex_t __gthread_mutex_t;

#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

#pragma weak pthread_once
#pragma weak pthread_key_create
#pragma weak pthread_key_delete
#pragma weak pthread_getspecific
#pragma weak pthread_setspecific
#pragma weak pthread_create

#pragma weak pthread_mutex_lock 
#pragma weak pthread_mutex_trylock 
#pragma weak pthread_mutex_unlock 

static void *__gthread_active_ptr = &pthread_create;

static inline int
__gthread_active_p ()
{
  return __gthread_active_ptr != 0;
}

#else /* not SUPPORTS_WEAK */

static inline int
__gthread_active_p ()
{
  return 1;
}

#endif /* SUPPORTS_WEAK */

static inline int
__gthread_once (__gthread_once_t *once, void (*func) ())
{
  if (__gthread_active_p ())
    return pthread_once (once, func);
  else
    return -1;
}

static inline int
__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
{
  return pthread_key_create (key, dtor);
}

static inline int
__gthread_key_dtor (__gthread_key_t key, void *ptr)
{
  /* Just reset the key value to zero. */
  if (ptr)
    return pthread_setspecific (key, 0);
  else
    return 0;
}

static inline int
__gthread_key_delete (__gthread_key_t key)
{
  return pthread_key_delete (key);
}

static inline void *
__gthread_getspecific (__gthread_key_t key)
{
  return pthread_getspecific (key);
}

static inline int
__gthread_setspecific (__gthread_key_t key, const void *ptr)
{
  return pthread_setspecific (key, ptr);
}

static inline int
__gthread_mutex_lock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_lock (mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_trylock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_trylock (mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_unlock (__gthread_mutex_t *mutex)
{
  if (__gthread_active_p ())
    return pthread_mutex_unlock (mutex);
  else
    return 0;
}

#endif /* not __gthr_posix_h */