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143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/* Threads compatibily routines for libgcc2 for VxWorks. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997 Free Software Foundation, Inc.
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Contributed by Mike Stump <mrs@wrs.com>.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef __gthr_vxworks_h
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#define __gthr_vxworks_h
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/* POSIX threads specific definitions.
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Easy, since the interface is just one-to-one mapping. */
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#define __GTHREADS 1
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#include <vxWorks.h>
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#include <semLib.h>
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/* typedef void *SEM_ID; */
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typedef int __gthread_key_t;
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typedef char __gthread_once_t;
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typedef SEM_ID __gthread_mutex_t;
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#define __GTHREAD_MUTEX_INIT 0
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#define __GTHREAD_ONCE_INIT 0
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#ifndef REG_SAVED_REG
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static inline int
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__gthread_once (__gthread_once_t *once, void (*func) ())
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{
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(*func)();
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return 0;
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}
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extern __gthread_key_t eh_context_key;
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/* This is not the right way to do it, but the semantic of pthreads
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don't map well enough onto VxWorks. */
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static void
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__ehdtor (void *pTcb)
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{
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int tid = (int) pTcb;
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void *p = (void*)taskVarGet(tid, &eh_context_key);
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if (p != (void*)-1)
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{
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if (p)
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free (p);
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taskVarSet(tid, &eh_context_key, 0);
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}
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}
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/* This only works for the code in libgcc2.c. */
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static inline int
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__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
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{
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*key = 0;
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/* Do this first so that the task variables are visible during the
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running of the delete hook. */
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taskVarInit();
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/* We don't have a way to track dtor here, so instead, we
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register a generic routine that can cleanup any task. */
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taskDeleteHookAdd (__ehdtor);
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return 0;
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}
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#define __gthread_setspecific(key, ptr) \
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(key = (int) ptr, 0)
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static inline int
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__gthread_key_dtor (__gthread_key_t key, void *ptr)
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{
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/* Just reset the key value to zero. */
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if (ptr)
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return __gthread_setspecific (key, 0);
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else
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return 0;
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}
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#define __gthread_key_delete(key) \
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taskVarDelete (taskIdSelf (), &key)
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#define __gthread_getspecific(key) \
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((key == 0) \
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? ((taskVarAdd (taskIdSelf (), &key) != OK) \
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? (__terminate (), (void*)0) \
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: (void*)0) \
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: (void*)key)
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#endif
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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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if (*mutex == 0)
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*mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
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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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if (*mutex == 0)
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*mutex = semMCreate (SEM_Q_PRIORITY | SEM_INVERSION_SAFE | SEM_DELETE_SAFE);
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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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/* We could return the */
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return semGive (*mutex);
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}
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#endif /* not __gthr_vxworks_h */
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