144 lines
5.3 KiB
C
144 lines
5.3 KiB
C
/* Thread and mutex controls for Objective C.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
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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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GNU CC is free software; you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2, or (at your option) any later version.
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GNU CC 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 FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along with
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GNU CC; see the file COPYING. If not, write to the Free Software
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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 files
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compiled with GCC to produce an executable, this does not cause
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the resulting executable 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 __thread_INCLUDE_GNU
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#define __thread_INCLUDE_GNU
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#include "objc/objc.h"
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/*************************************************************************
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* Universal static variables:
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*/
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extern int __objc_thread_exit_status; /* Global exit status. */
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/********
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* Thread safe implementation types and functions.
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*/
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/* Thread priorities */
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#define OBJC_THREAD_INTERACTIVE_PRIORITY 2
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#define OBJC_THREAD_BACKGROUND_PRIORITY 1
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#define OBJC_THREAD_LOW_PRIORITY 0
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/* A thread */
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typedef void * objc_thread_t;
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/* This structure represents a single mutual exclusion lock. */
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struct objc_mutex
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{
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volatile objc_thread_t owner; /* Id of thread that owns. */
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volatile int depth; /* # of acquires. */
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void * backend; /* Specific to backend */
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};
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typedef struct objc_mutex *objc_mutex_t;
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/* This structure represents a single condition mutex */
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struct objc_condition
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{
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void * backend; /* Specific to backend */
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};
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typedef struct objc_condition *objc_condition_t;
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/* Frontend mutex functions */
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objc_mutex_t objc_mutex_allocate(void);
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int objc_mutex_deallocate(objc_mutex_t mutex);
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int objc_mutex_lock(objc_mutex_t mutex);
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int objc_mutex_unlock(objc_mutex_t mutex);
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int objc_mutex_trylock(objc_mutex_t mutex);
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/* Frontend condition mutex functions */
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objc_condition_t objc_condition_allocate(void);
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int objc_condition_deallocate(objc_condition_t condition);
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int objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex);
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int objc_condition_signal(objc_condition_t condition);
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int objc_condition_broadcast(objc_condition_t condition);
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/* Frontend thread functions */
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objc_thread_t objc_thread_detach(SEL selector, id object, id argument);
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void objc_thread_yield(void);
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int objc_thread_exit(void);
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int objc_thread_set_priority(int priority);
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int objc_thread_get_priority(void);
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void * objc_thread_get_data(void);
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int objc_thread_set_data(void *value);
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objc_thread_t objc_thread_id(void);
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/*
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Use this to set the hook function that will be called when the
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runtime initially becomes multi threaded.
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The hook function is only called once, meaning only when the
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2nd thread is spawned, not for each and every thread.
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It returns the previous hook function or NULL if there is none.
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A program outside of the runtime could set this to some function so
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it can be informed; for example, the GNUstep Base Library sets it
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so it can implement the NSBecomingMultiThreaded notification.
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*/
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typedef void (*objc_thread_callback)();
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objc_thread_callback objc_set_thread_callback(objc_thread_callback func);
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/* Backend initialization functions */
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int __objc_init_thread_system(void);
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int __objc_fini_thread_system(void);
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/* Backend mutex functions */
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int __objc_mutex_allocate(objc_mutex_t mutex);
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int __objc_mutex_deallocate(objc_mutex_t mutex);
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int __objc_mutex_lock(objc_mutex_t mutex);
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int __objc_mutex_trylock(objc_mutex_t mutex);
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int __objc_mutex_unlock(objc_mutex_t mutex);
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/* Backend condition mutex functions */
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int __objc_condition_allocate(objc_condition_t condition);
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int __objc_condition_deallocate(objc_condition_t condition);
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int __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex);
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int __objc_condition_broadcast(objc_condition_t condition);
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int __objc_condition_signal(objc_condition_t condition);
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/* Backend thread functions */
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objc_thread_t __objc_thread_detach(void (*func)(void *arg), void *arg);
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int __objc_thread_set_priority(int priority);
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int __objc_thread_get_priority(void);
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void __objc_thread_yield(void);
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int __objc_thread_exit(void);
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objc_thread_t __objc_thread_id(void);
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int __objc_thread_set_data(void *value);
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void * __objc_thread_get_data(void);
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#endif /* not __thread_INCLUDE_GNU */
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