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/* Threads compatibility routines for libgcc2 and libobjc.  */

/* Compile this one with gcc.  */

/* Copyright (C) 1997, 1999, 2000, 2001, 2004, 2005, 2008, 2009

   Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 3, or (at your option) any later

version.

GCC 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#ifndef GCC_GTHR_DCE_H

#define GCC_GTHR_DCE_H

/* If _DCE_THREADS is not defined, then we're building the single

   threaded version of the libraries and do not want to reference

   anything related to pthreads or dce.  */

#ifndef _DCE_THREADS

#include "gthr-single.h"

#else

/* DCE threads interface.

   DCE threads are based on POSIX threads draft 4, and many things

   have changed since then.  */

/* Make sure CONST_CAST2 (original in system.h) is defined.  */

#ifndef CONST_CAST2

#ifdef __cplusplus

#define CONST_CAST2(TOTYPE,FROMTYPE,X) (const_cast<TOTYPE> (X))

#else

#define CONST_CAST2(TOTYPE,FROMTYPE,X) ((__extension__(union {FROMTYPE _q; TOTYPE _nq;})(X))._nq)

#endif

#endif

#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;

typedef pthread_mutex_t __gthread_recursive_mutex_t;

#define __GTHREAD_ONCE_INIT pthread_once_init

#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function

#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function

#define __GTHREAD_MUTEX_INIT_DEFAULT pthread_once_init

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

# define __gthrw(name) \

  static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));

# define __gthrw_(name) __gthrw_ ## name

#else

# define __gthrw(name)

# define __gthrw_(name) name

#endif

__gthrw(pthread_once)

__gthrw(pthread_keycreate)

__gthrw(pthread_getspecific)

__gthrw(pthread_setspecific)

__gthrw(pthread_create)

__gthrw(pthread_mutex_init)

__gthrw(pthread_mutex_destroy)

__gthrw(pthread_mutex_lock)

__gthrw(pthread_mutex_trylock)

__gthrw(pthread_mutex_unlock)

__gthrw(pthread_mutexattr_create)

__gthrw(pthread_mutexattr_setkind_np)

__gthrw(pthread_mutexattr_delete)

#ifdef _LIBOBJC

/* Objective-C.  */

__gthrw(pthread_cond_broadcast)

__gthrw(pthread_cond_destroy)

__gthrw(pthread_cond_init)

__gthrw(pthread_cond_signal)

__gthrw(pthread_cond_wait)

__gthrw(pthread_exit)

#ifdef pthread_getunique_np

# define __gthrw_pthread_getunique_np pthread_getunique_np

#else

__gthrw(pthread_getunique_np)

# define __gthrw_pthread_getunique_np __gthrw_(pthread_getunique_np)

#endif

__gthrw(pthread_mutex_destroy)

__gthrw(pthread_self)

__gthrw(pthread_yield)

#endif

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

static inline int

__gthread_active_p (void)

{

  static void *const __gthread_active_ptr = (void *) &__gthrw_(pthread_create);

  return __gthread_active_ptr != 0;

}

#else /* not SUPPORTS_WEAK */

static inline int

__gthread_active_p (void)

{

  return 1;

}

#endif /* SUPPORTS_WEAK */

#ifdef _LIBOBJC

/* Key structure for maintaining thread specific storage */

static pthread_key_t _objc_thread_storage;

/* Thread local storage for a single thread */

static void *thread_local_storage = NULL;

/* Backend initialization functions */

/* Initialize the threads subsystem.  */

static inline int

__gthread_objc_init_thread_system (void)

{

  if (__gthread_active_p ())

    /* Initialize the thread storage key.  */

    return __gthrw_(pthread_keycreate) (&_objc_thread_storage, NULL);

  else

    return -1;

}

/* Close the threads subsystem.  */

static inline int

__gthread_objc_close_thread_system (void)

{

  if (__gthread_active_p ())

    return 0;

  else

    return -1;

}

/* Backend thread functions */

/* Create a new thread of execution.  */

static inline objc_thread_t

__gthread_objc_thread_detach (void (*func)(void *), void *arg)

{

  objc_thread_t thread_id;

  pthread_t new_thread_handle;

  if (!__gthread_active_p ())

    return NULL;

  if (!(__gthrw_(pthread_create) (&new_thread_handle, pthread_attr_default,

                        (void *) func, arg)))

    {

      /* ??? May not work! (64bit) */

      thread_id = *(objc_thread_t *) &new_thread_handle;

      pthread_detach (&new_thread_handle); /* Fully detach thread.  */

    }

  else

    thread_id = NULL;

  return thread_id;

}

/* Set the current thread's priority.  */

static inline int

__gthread_objc_thread_set_priority (int priority)

{

  int sys_priority = 0;

  if (!__gthread_active_p ())

    return -1;

  switch (priority)

    {

    case OBJC_THREAD_INTERACTIVE_PRIORITY:

      sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;

      break;

    default:

    case OBJC_THREAD_BACKGROUND_PRIORITY:

      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;

      break;

    case OBJC_THREAD_LOW_PRIORITY:

      sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;

      break;

    }

  /* Change the priority.  */

  if (pthread_setprio (__gthrw_(pthread_self) (), sys_priority) >= 0)

    return 0;

  else

    /* Failed */

    return -1;

}

/* Return the current thread's priority.  */

static inline int

__gthread_objc_thread_get_priority (void)

{

  int sys_priority;

  if (__gthread_active_p ())

    {

      if ((sys_priority = pthread_getprio (__gthrw_(pthread_self) ())) >= 0)

        {

          if (sys_priority >= PRI_FG_MIN_NP

              && sys_priority <= PRI_FG_MAX_NP)

            return OBJC_THREAD_INTERACTIVE_PRIORITY;

          if (sys_priority >= PRI_BG_MIN_NP

              && sys_priority <= PRI_BG_MAX_NP)

            return OBJC_THREAD_BACKGROUND_PRIORITY;

          return OBJC_THREAD_LOW_PRIORITY;

        }

      /* Failed */

      return -1;

    }

  else

    return OBJC_THREAD_INTERACTIVE_PRIORITY;

}

/* Yield our process time to another thread.  */

static inline void

__gthread_objc_thread_yield (void)

{

  if (__gthread_active_p ())

    __gthrw_(pthread_yield) ();

}

/* Terminate the current thread.  */

static inline int

__gthread_objc_thread_exit (void)

{

  if (__gthread_active_p ())

    /* exit the thread */

    __gthrw_(pthread_exit) (&__objc_thread_exit_status);

  /* Failed if we reached here */

  return -1;

}

/* Returns an integer value which uniquely describes a thread.  */

static inline objc_thread_t

__gthread_objc_thread_id (void)

{

  if (__gthread_active_p ())

    {

      pthread_t self = __gthrw_(pthread_self) ();

      return (objc_thread_t) __gthrw_pthread_getunique_np (&self);

    }

  else

    return (objc_thread_t) 1;

}

/* Sets the thread's local storage pointer.  */

static inline int

__gthread_objc_thread_set_data (void *value)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_setspecific) (_objc_thread_storage, value);

  else

    {

      thread_local_storage = value;

      return 0;

    }

}

/* Returns the thread's local storage pointer.  */

static inline void *

__gthread_objc_thread_get_data (void)

{

  void *value = NULL;

  if (__gthread_active_p ())

    {

      if (!(__gthrw_(pthread_getspecific) (_objc_thread_storage, &value)))

        return value;

      return NULL;

    }

  else

    return thread_local_storage;

}

/* Backend mutex functions */

/* Allocate a mutex.  */

static inline int

__gthread_objc_mutex_allocate (objc_mutex_t mutex)

{

  if (__gthread_active_p ())

    {

      mutex->backend = objc_malloc (sizeof (pthread_mutex_t));

      if (__gthrw_(pthread_mutex_init) ((pthread_mutex_t *) mutex->backend,

                              pthread_mutexattr_default))

        {

          objc_free (mutex->backend);

          mutex->backend = NULL;

          return -1;

        }

    }

  return 0;

}

/* Deallocate a mutex.  */

static inline int

__gthread_objc_mutex_deallocate (objc_mutex_t mutex)

{

  if (__gthread_active_p ())

    {

      if (__gthrw_(pthread_mutex_destroy) ((pthread_mutex_t *) mutex->backend))

        return -1;

      objc_free (mutex->backend);

      mutex->backend = NULL;

    }

  return 0;

}

/* Grab a lock on a mutex.  */

static inline int

__gthread_objc_mutex_lock (objc_mutex_t mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_lock) ((pthread_mutex_t *) mutex->backend);

  else

    return 0;

}

/* Try to grab a lock on a mutex.  */

static inline int

__gthread_objc_mutex_trylock (objc_mutex_t mutex)

{

  if (__gthread_active_p ()

      && __gthrw_(pthread_mutex_trylock) ((pthread_mutex_t *) mutex->backend) != 1)

    return -1;

  return 0;

}

/* Unlock the mutex */

static inline int

__gthread_objc_mutex_unlock (objc_mutex_t mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);

  else

    return 0;

}

/* Backend condition mutex functions */

/* Allocate a condition.  */

static inline int

__gthread_objc_condition_allocate (objc_condition_t condition

                                   __attribute__ ((__unused__)))

{

  if (__gthread_active_p ())

    /* Unimplemented.  */

    return -1;

  else

    return 0;

}

/* Deallocate a condition.  */

static inline int

__gthread_objc_condition_deallocate (objc_condition_t condition

                                     __attribute__ ((__unused__)))

{

  if (__gthread_active_p ())

    /* Unimplemented.  */

    return -1;

  else

    return 0;

}

/* Wait on the condition */

static inline int

__gthread_objc_condition_wait (objc_condition_t condition

                               __attribute__ ((__unused__)),

                               objc_mutex_t mutex __attribute__ ((__unused__)))

{

  if (__gthread_active_p ())

    /* Unimplemented.  */

    return -1;

  else

    return 0;

}

/* Wake up all threads waiting on this condition.  */

static inline int

__gthread_objc_condition_broadcast (objc_condition_t condition

                                    __attribute__ ((__unused__)))

{

  if (__gthread_active_p ())

    /* Unimplemented.  */

    return -1;

  else

    return 0;

}

/* Wake up one thread waiting on this condition.  */

static inline int

__gthread_objc_condition_signal (objc_condition_t condition

                                 __attribute__ ((__unused__)))

{

  if (__gthread_active_p ())

    /* Unimplemented.  */

    return -1;

  else

    return 0;

}

#else /* _LIBOBJC */

static inline int

__gthread_once (__gthread_once_t *__once, void (*__func) (void))

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_once) (__once, __func);

  else

    return -1;

}

static inline int

__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))

{

  return __gthrw_(pthread_keycreate) (__key, __dtor);

}

static inline int

__gthread_key_delete (__gthread_key_t __key __attribute__ ((__unused__)))

{

  /* Operation is not supported.  */

  return -1;

}

static inline void *

__gthread_getspecific (__gthread_key_t __key)

{

  void *__ptr;

  if (__gthrw_(pthread_getspecific) (__key, &__ptr) == 0)

    return __ptr;

  else

    return 0;

}

static inline int

__gthread_setspecific (__gthread_key_t __key, const void *__ptr)

{

  return __gthrw_(pthread_setspecific)

    (__key, CONST_CAST2(void *, const void *, __ptr));

}

static inline void

__gthread_mutex_init_function (__gthread_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    __gthrw_(pthread_mutex_init) (__mutex, pthread_mutexattr_default);

}

static inline int

__gthread_mutx_destroy (__gthread_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_destroy) (__mutex);

  else

    return 0;

}

static inline int

__gthread_mutex_lock (__gthread_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_lock) (__mutex);

  else

    return 0;

}

static inline int

__gthread_mutex_trylock (__gthread_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_trylock) (__mutex);

  else

    return 0;

}

static inline int

__gthread_mutex_unlock (__gthread_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    return __gthrw_(pthread_mutex_unlock) (__mutex);

  else

    return 0;

}

static inline int

__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)

{

  if (__gthread_active_p ())

    {

      pthread_mutexattr_t __attr;

      int __r;

      __r = __gthrw_(pthread_mutexattr_create) (&__attr);

      if (!__r)

        __r = __gthrw_(pthread_mutexattr_setkind_np) (&__attr,

                                                      MUTEX_RECURSIVE_NP);

      if (!__r)

        __r = __gthrw_(pthread_mutex_init) (__mutex, __attr);

      if (!__r)

        __r = __gthrw_(pthread_mutexattr_delete) (&__attr);

      return __r;

    }

  return 0;

}

static inline int

__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)

{

  return __gthread_mutex_lock (__mutex);

}

static inline int

__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)

{

  return __gthread_mutex_trylock (__mutex);

}

static inline int

__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)

{

  return __gthread_mutex_unlock (__mutex);

}

#endif /* _LIBOBJC */

#endif

#endif /* ! GCC_GTHR_DCE_H */