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

/* Compile this one with gcc.  */

/* Copyright (C) 2002, 2003, 2004, 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_NKS_H

#define GCC_GTHR_NKS_H

/* NKS threads specific definitions.

   Easy, since the interface is mostly one-to-one mapping.  */

#define __GTHREADS 1

#define NKS_NO_INLINE_FUNCS

#include <nksapi.h>

#include <string.h>

typedef NXKey_t __gthread_key_t;

typedef NXMutex_t *__gthread_mutex_t;

typedef NXMutex_t *__gthread_recursive_mutex_t;

#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function

#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function

static inline int

__gthread_active_p (void)

{

  return 1;

}

#ifdef _LIBOBJC

/* This is the config.h file in libobjc/ */

#include <config.h>

#ifdef HAVE_SCHED_H

# include <sched.h>

#endif

/* Key structure for maintaining thread specific storage */

static NXKey_t _objc_thread_storage;

/* Backend initialization functions */

/* Initialize the threads subsystem.  */

static inline int

__gthread_objc_init_thread_system (void)

{

  /* Initialize the thread storage key.  */

  if (NXKeyCreate (NULL, NULL, &_objc_thread_storage) == 0)

    return 0;

  return -1;

}

/* Close the threads subsystem.  */

static inline int

__gthread_objc_close_thread_system (void)

{

  if (NXKeyDelete (_objc_thread_storage) == 0)

    return 0;

  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;

  NXContext_t context;

  NXThreadId_t new_thread_handle;

  int err;

  if ((context = NXContextAlloc (func, arg, NX_PRIO_MED, 0, 0, 0, &err)) == NULL)

    thread_id = NULL;

  else if (NXThreadCreate (context, NX_THR_DETACHED, &new_thread_handle) == 0)

    thread_id = (objc_thread_t) new_thread_handle;

  else {

    NXContextFree (context);

    thread_id = NULL;

  }

  return thread_id;

}

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

static inline int

__gthread_objc_thread_set_priority (int priority)

{

  if (NXThreadSetPriority (NXThreadGetId (), priority) == 0)

    return 0;

  return -1;

}

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

static inline int

__gthread_objc_thread_get_priority (void)

{

  int priority;

  if (NXThreadGetPriority (NXThreadGetId (), &priority) == 0)

    return priority;

  return -1;

}

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

static inline void

__gthread_objc_thread_yield (void)

{

  NXThreadYield ();

}

/* Terminate the current thread.  */

static inline int

__gthread_objc_thread_exit (void)

{

  /* exit the thread */

  NXThreadExit (&__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)

{

  (objc_thread_t) NXThreadGetId ();

}

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

static inline int

__gthread_objc_thread_set_data (void *value)

{

  return NXKeySetValue (_objc_thread_storage, value);

}

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

static inline void *

__gthread_objc_thread_get_data (void)

{

  void *value;

  if (NXKeyGetValue (_objc_thread_storage, &value) == 0)

    return value;

  return NULL;

}

/* Backend mutex functions */

/* Allocate a mutex.  */

static inline int

__gthread_objc_mutex_allocate (objc_mutex_t mutex)

{

  static const NX_LOCK_INFO_ALLOC (info, "GNU ObjC", 0);

  if ((mutex->backend = NXMutexAlloc (0, 0, &info)) == NULL)

    return 0;

  return -1;

}

/* Deallocate a mutex.  */

static inline int

__gthread_objc_mutex_deallocate (objc_mutex_t mutex)

{

  while (NXMutexIsOwned ((NXMutex_t *)mutex->backend))

    NXUnlock ((NXMutex_t *)mutex->backend);

  if (NXMutexFree ((NXMutex_t *)mutex->backend) != 0)

    return -1;

  mutex->backend = NULL;

  return 0;

}

/* Grab a lock on a mutex.  */

static inline int

__gthread_objc_mutex_lock (objc_mutex_t mutex)

{

  return NXLock ((NXMutex_t *)mutex->backend);

}

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

static inline int

__gthread_objc_mutex_trylock (objc_mutex_t mutex)

{

  if (!NXTryLock ((NXMutex_t *)mutex->backend))

    return -1;

  return 0;

}

/* Unlock the mutex */

static inline int

__gthread_objc_mutex_unlock (objc_mutex_t mutex)

{

  return NXUnlock ((NXMutex_t *)mutex->backend);

}

/* Backend condition mutex functions */

/* Allocate a condition.  */

static inline int

__gthread_objc_condition_allocate (objc_condition_t condition)

{

  condition->backend = NXCondAlloc (NULL);

  if (condition->backend == NULL)

    return -1;

  return 0;

}

/* Deallocate a condition.  */

static inline int

__gthread_objc_condition_deallocate (objc_condition_t condition)

{

   if (NXCondFree ((NXCond_t *)condition->backend) != 0)

     return -1;

   condition->backend = NULL;

   return 0;

}

/* Wait on the condition */

static inline int

__gthread_objc_condition_wait (objc_condition_t condition, objc_mutex_t mutex)

{

  return NXCondWait ((NXCond_t *)condition->backend, (NXMutex_t *)mutex->backend);

}

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

static inline int

__gthread_objc_condition_broadcast (objc_condition_t condition)

{

  return NXCondBroadcast ((NXCond_t *)condition->backend);

}

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

static inline int

__gthread_objc_condition_signal (objc_condition_t condition)

{

  return NXCondSignal ((NXCond_t *)condition->backend);

}

#else /* _LIBOBJC */

#if defined(__cplusplus)

# include <bits/atomicity.h>

/* The remaining conditions here are temporary until there is

   an application accessible atomic operations API set... */

#elif defined(_M_IA64) || defined(__ia64__)

# include <../libstdc++-v3/config/cpu/ia64/bits/atomicity.h>

#elif defined(_M_IX86) || defined(__i486__)

# include <../libstdc++-v3/config/cpu/i486/bits/atomicity.h>

#elif defined(_M_AMD64) || defined(__x86_64__)

# include <../libstdc++-v3/config/cpu/x86-64/bits/atomicity.h>

#endif

typedef volatile long __gthread_once_t;

#define __GTHREAD_ONCE_INIT 0

static inline int

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

{

  if (__compare_and_swap (__once, 0, 1))

  {

    __func ();

    *__once |= 2;

  }

  else

  {

    while (!(*__once & 2))

      NXThreadYield ();

  }

  return 0;

}

static inline int

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

{

  return NXKeyCreate (__dtor, NULL, __key);

}

static inline int

__gthread_key_dtor (__gthread_key_t __key, void *__ptr)

{

  /* Just reset the key value to zero. */

  if (__ptr)

    return NXKeySetValue (__key, NULL);

  return 0;

}

static inline int

__gthread_key_delete (__gthread_key_t __key)

{

  return NXKeyDelete (__key);

}

static inline void *

__gthread_getspecific (__gthread_key_t __key)

{

  void *__value;

  if (NXKeyGetValue (__key, &__value) == 0)

    return __value;

  return NULL;

}

static inline int

__gthread_setspecific (__gthread_key_t __key, const void *__ptr)

{

  return NXKeySetValue (__key, (void *)__ptr);

}

static inline void

__gthread_mutex_init_function (__gthread_mutex_t *__mutex)

{

  static const NX_LOCK_INFO_ALLOC (__info, "GTHREADS", 0);

  *__mutex = NXMutexAlloc (0, 0, &__info);

}

static inline int

__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(__mutex))

{

  return 0;

}

static inline int

__gthread_mutex_lock (__gthread_mutex_t *__mutex)

{

  return NXLock (*__mutex);

}

static inline int

__gthread_mutex_trylock (__gthread_mutex_t *__mutex)

{

  if (NXTryLock (*__mutex))

    return 0;

  return -1;

}

static inline int

__gthread_mutex_unlock (__gthread_mutex_t *__mutex)

{

  return NXUnlock (*__mutex);

}

static inline void

__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)

{

  static const NX_LOCK_INFO_ALLOC (__info, "GTHREADS", 0);

  *__mutex = NXMutexAlloc (NX_MUTEX_RECURSIVE, 0, &__info);

}

static inline int

__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)

{

  return NXLock (*__mutex);

}

static inline int

__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)

{

  if (NXTryLock (*__mutex))

    return 0;

  return -1;

}

static inline int

__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)

{

  return NXUnlock (*__mutex);

}

#endif /* _LIBOBJC */

#endif /* not GCC_GTHR_NKS_H */