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

/* Compile this one with gcc.  */

/* Copyright (C) 1997, 1999, 2000, 2008, 2009, 2011

   Free Software Foundation, Inc.

   Contributed by Mike Stump <mrs@wrs.com>.

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_VXWORKS_H

#define GCC_GTHR_VXWORKS_H

#ifdef _LIBOBJC

/* libobjc requires the optional pthreads component.  */

#include "gthr-posix.h"

#else

#ifdef __cplusplus

#define UNUSED(x)

#else

#define UNUSED(x) x __attribute__((unused))

#endif

#ifdef __cplusplus

extern "C" {

#endif

#define __GTHREADS 1

#define __gthread_active_p() 1

/* Mutexes are easy, except that they need to be initialized at runtime.  */

#include <semLib.h>

typedef SEM_ID __gthread_mutex_t;

/* All VxWorks mutexes are recursive.  */

typedef SEM_ID __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 void

__gthread_mutex_init_function (__gthread_mutex_t *mutex)

{

  *mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);

}

static inline int

__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))

{

  return 0;

}

static inline int

__gthread_mutex_lock (__gthread_mutex_t *mutex)

{

  return semTake (*mutex, WAIT_FOREVER);

}

static inline int

__gthread_mutex_trylock (__gthread_mutex_t *mutex)

{

  return semTake (*mutex, NO_WAIT);

}

static inline int

__gthread_mutex_unlock (__gthread_mutex_t *mutex)

{

  return semGive (*mutex);

}

static inline void

__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)

{

  __gthread_mutex_init_function (mutex);

}

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);

}

/* pthread_once is complicated enough that it's implemented

   out-of-line.  See config/vxlib.c.  */

typedef struct

{

#if !defined(__RTP__)

#if defined(__PPC__)

  __attribute ((aligned (__alignof (unsigned))))

#endif

  volatile unsigned char busy;

#endif

  volatile unsigned char done;

#if !defined(__RTP__) && defined(__PPC__)

  /* PPC's test-and-set implementation requires a 4 byte aligned

     object, of which it only sets the first byte.  We use padding

     here, in order to maintain some amount of backwards

     compatibility.  Without this padding, gthread_once objects worked

     by accident because they happen to be static objects and the ppc

     port automatically increased their alignment to 4 bytes.  */

  unsigned char pad1;

  unsigned char pad2;

#endif

}

__gthread_once_t;

#if defined (__RTP__)

# define __GTHREAD_ONCE_INIT { 0 }

#elif defined (__PPC__)

# define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }

#else

# define __GTHREAD_ONCE_INIT { 0, 0 }

#endif

extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));

/* Thread-specific data requires a great deal of effort, since VxWorks

   is not really set up for it.  See config/vxlib.c for the gory

   details.  All the TSD routines are sufficiently complex that they

   need to be implemented out of line.  */

typedef unsigned int __gthread_key_t;

extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));

extern int __gthread_key_delete (__gthread_key_t __key);

extern void *__gthread_getspecific (__gthread_key_t __key);

extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);

#undef UNUSED

#ifdef __cplusplus

}

#endif

#endif /* not _LIBOBJC */

#endif /* gthr-vxworks.h */