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/* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */
/* Compile this one with gcc. */
/* Copyright (C) 1997-2017 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);
}
static inline int
__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
{
return __gthread_mutex_destroy (__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 */
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