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117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/* Thread and mutex controls for Objective C.
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Copyright (C) 1996-2023 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 GCC.
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GCC 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 3, or (at your option)
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any later version.
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GCC 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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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 __thread_INCLUDE_GNU
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#define __thread_INCLUDE_GNU
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#include "objc.h"
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#ifdef __cplusplus
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extern "C" {
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#endif /* __cplusplus */
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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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void objc_thread_add (void);
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void objc_thread_remove (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) (void);
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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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#ifdef __cplusplus
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}
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#endif /* __cplusplus */
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#endif /* not __thread_INCLUDE_GNU */
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