311 lines
6.7 KiB
C
311 lines
6.7 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, 1999, 2000 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 2, 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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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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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 GCC_GTHR_VXWORKS_H
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#define GCC_GTHR_VXWORKS_H
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#ifdef _LIBOBJC
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/* Thread local storage for a single thread */
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static void *thread_local_storage = NULL;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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int
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__gthread_objc_init_thread_system(void)
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{
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/* No thread support available */
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return -1;
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}
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/* Close the threads subsystem. */
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int
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__gthread_objc_close_thread_system(void)
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{
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/* No thread support available */
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return -1;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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objc_thread_t
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__gthread_objc_thread_detach(void (*func)(void *arg), void *arg)
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{
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/* No thread support available */
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return NULL;
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}
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/* Set the current thread's priority. */
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int
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__gthread_objc_thread_set_priority(int priority)
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{
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/* No thread support available */
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return -1;
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}
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/* Return the current thread's priority. */
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int
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__gthread_objc_thread_get_priority(void)
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{
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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}
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/* Yield our process time to another thread. */
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void
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__gthread_objc_thread_yield(void)
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{
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return;
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}
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/* Terminate the current thread. */
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int
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__gthread_objc_thread_exit(void)
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{
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/* No thread support available */
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/* Should we really exit the program */
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/* exit(&__objc_thread_exit_status); */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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objc_thread_t
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__gthread_objc_thread_id(void)
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{
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/* No thread support, use 1. */
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return (objc_thread_t)1;
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}
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/* Sets the thread's local storage pointer. */
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int
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__gthread_objc_thread_set_data(void *value)
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{
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thread_local_storage = value;
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return 0;
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}
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/* Returns the thread's local storage pointer. */
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void *
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__gthread_objc_thread_get_data(void)
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{
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return thread_local_storage;
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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int
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__gthread_objc_mutex_allocate(objc_mutex_t mutex)
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{
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return 0;
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}
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/* Deallocate a mutex. */
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int
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__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
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{
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return 0;
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}
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/* Grab a lock on a mutex. */
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int
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__gthread_objc_mutex_lock(objc_mutex_t mutex)
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{
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/* There can only be one thread, so we always get the lock */
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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int
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__gthread_objc_mutex_trylock(objc_mutex_t mutex)
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{
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/* There can only be one thread, so we always get the lock */
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return 0;
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}
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/* Unlock the mutex */
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int
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__gthread_objc_mutex_unlock(objc_mutex_t mutex)
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{
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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int
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__gthread_objc_condition_allocate(objc_condition_t condition)
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{
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return 0;
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}
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/* Deallocate a condition. */
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int
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__gthread_objc_condition_deallocate(objc_condition_t condition)
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{
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return 0;
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}
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/* Wait on the condition */
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int
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__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
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{
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return 0;
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}
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/* Wake up all threads waiting on this condition. */
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int
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__gthread_objc_condition_broadcast(objc_condition_t condition)
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{
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return 0;
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}
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/* Wake up one thread waiting on this condition. */
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int
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__gthread_objc_condition_signal(objc_condition_t condition)
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{
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return 0;
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}
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#else /* _LIBOBJC */
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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) (void))
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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 /* _LIBOBJC */
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#endif /* ! GCC_GTHR_VXWORKS_H */
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