176 lines
4.7 KiB
C
176 lines
4.7 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc for VxWorks. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997-2015 Free Software Foundation, Inc.
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Contributed by Mike Stump <mrs@wrs.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#ifndef GCC_GTHR_VXWORKS_H
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#define GCC_GTHR_VXWORKS_H
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#ifdef _LIBOBJC
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/* libobjc requires the optional pthreads component. */
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#include "gthr-posix.h"
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#else
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#ifdef __cplusplus
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#define UNUSED(x)
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#else
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#define UNUSED(x) x __attribute__((unused))
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define __GTHREADS 1
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#define __gthread_active_p() 1
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/* Mutexes are easy, except that they need to be initialized at runtime. */
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#include <semLib.h>
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typedef SEM_ID __gthread_mutex_t;
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/* All VxWorks mutexes are recursive. */
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typedef SEM_ID __gthread_recursive_mutex_t;
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#define __GTHREAD_MUTEX_INIT_FUNCTION __gthread_mutex_init_function
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#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
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static inline void
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__gthread_mutex_init_function (__gthread_mutex_t *mutex)
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{
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*mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
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}
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static inline int
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__gthread_mutex_destroy (__gthread_mutex_t * UNUSED(mutex))
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{
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return 0;
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *mutex)
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{
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return semTake (*mutex, WAIT_FOREVER);
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *mutex)
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{
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return semTake (*mutex, NO_WAIT);
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *mutex)
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{
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return semGive (*mutex);
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}
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static inline void
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__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *mutex)
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{
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__gthread_mutex_init_function (mutex);
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}
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static inline int
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__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *mutex)
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{
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return __gthread_mutex_lock (mutex);
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}
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static inline int
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__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *mutex)
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{
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return __gthread_mutex_trylock (mutex);
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}
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static inline int
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__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *mutex)
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{
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return __gthread_mutex_unlock (mutex);
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}
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static inline int
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__gthread_recursive_mutex_destroy (__gthread_recursive_mutex_t *__mutex)
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{
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return __gthread_mutex_destroy (__mutex);
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}
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/* pthread_once is complicated enough that it's implemented
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out-of-line. See config/vxlib.c. */
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typedef struct
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{
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#if !defined(__RTP__)
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#if defined(__PPC__)
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__attribute ((aligned (__alignof (unsigned))))
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#endif
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volatile unsigned char busy;
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#endif
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volatile unsigned char done;
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#if !defined(__RTP__) && defined(__PPC__)
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/* PPC's test-and-set implementation requires a 4 byte aligned
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object, of which it only sets the first byte. We use padding
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here, in order to maintain some amount of backwards
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compatibility. Without this padding, gthread_once objects worked
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by accident because they happen to be static objects and the ppc
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port automatically increased their alignment to 4 bytes. */
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unsigned char pad1;
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unsigned char pad2;
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#endif
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}
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__gthread_once_t;
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#if defined (__RTP__)
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# define __GTHREAD_ONCE_INIT { 0 }
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#elif defined (__PPC__)
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# define __GTHREAD_ONCE_INIT { 0, 0, 0, 0 }
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#else
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# define __GTHREAD_ONCE_INIT { 0, 0 }
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#endif
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extern int __gthread_once (__gthread_once_t *__once, void (*__func)(void));
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/* Thread-specific data requires a great deal of effort, since VxWorks
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is not really set up for it. See config/vxlib.c for the gory
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details. All the TSD routines are sufficiently complex that they
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need to be implemented out of line. */
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typedef unsigned int __gthread_key_t;
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extern int __gthread_key_create (__gthread_key_t *__keyp, void (*__dtor)(void *));
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extern int __gthread_key_delete (__gthread_key_t __key);
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extern void *__gthread_getspecific (__gthread_key_t __key);
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extern int __gthread_setspecific (__gthread_key_t __key, void *__ptr);
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#undef UNUSED
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#ifdef __cplusplus
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}
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#endif
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#endif /* not _LIBOBJC */
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#endif /* gthr-vxworks.h */
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