home *** CD-ROM | disk | FTP | other *** search
- /* Thread and mutex controls for Objective C.
- Copyright (C) 1996, 1997 Free Software Foundation, Inc.
- Contributed by Galen C. Hunt (gchunt@cs.rochester.edu)
-
- This file is part of GNU CC.
-
- GNU CC is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2, or (at your option)
- any later version.
-
- GNU CC is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- GNU CC is free software; you can redistribute it and/or modify it under the
- terms of the GNU General Public License as published by the Free Software
- Foundation; either version 2, or (at your option) any later version.
-
- GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
- WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
- details.
-
- You should have received a copy of the GNU General Public License along with
- GNU CC; see the file COPYING. If not, write to the Free Software
- Foundation, 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
- /* As a special exception, if you link this library with files
- compiled with GCC to produce an executable, this does not cause
- the resulting executable to be covered by the GNU General Public License.
- This exception does not however invalidate any other reasons why
- the executable file might be covered by the GNU General Public License. */
-
-
- #ifndef __thread_INCLUDE_GNU
- #define __thread_INCLUDE_GNU
-
- #include "objc/objc.h"
-
- /*************************************************************************
- * Universal static variables:
- */
- extern int __objc_thread_exit_status; /* Global exit status. */
-
- /********
- * Thread safe implementation types and functions.
- */
-
- /* Thread priorities */
- #define OBJC_THREAD_INTERACTIVE_PRIORITY 2
- #define OBJC_THREAD_BACKGROUND_PRIORITY 1
- #define OBJC_THREAD_LOW_PRIORITY 0
-
- /* A thread */
- typedef void * objc_thread_t;
-
- /* This structure represents a single mutual exclusion lock. */
- struct objc_mutex
- {
- volatile objc_thread_t owner; /* Id of thread that owns. */
- volatile int depth; /* # of acquires. */
- void * backend; /* Specific to backend */
- };
- typedef struct objc_mutex *objc_mutex_t;
-
- /* This structure represents a single condition mutex */
- struct objc_condition
- {
- void * backend; /* Specific to backend */
- };
- typedef struct objc_condition *objc_condition_t;
-
- /* Frontend mutex functions */
- objc_mutex_t objc_mutex_allocate(void);
- int objc_mutex_deallocate(objc_mutex_t mutex);
- int objc_mutex_lock(objc_mutex_t mutex);
- int objc_mutex_unlock(objc_mutex_t mutex);
- int objc_mutex_trylock(objc_mutex_t mutex);
-
- /* Frontend condition mutex functions */
- objc_condition_t objc_condition_allocate(void);
- int objc_condition_deallocate(objc_condition_t condition);
- int objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex);
- int objc_condition_signal(objc_condition_t condition);
- int objc_condition_broadcast(objc_condition_t condition);
-
- /* Frontend thread functions */
- objc_thread_t objc_thread_detach(SEL selector, id object, id argument);
- void objc_thread_yield(void);
- int objc_thread_exit(void);
- int objc_thread_set_priority(int priority);
- int objc_thread_get_priority(void);
- void * objc_thread_get_data(void);
- int objc_thread_set_data(void *value);
- objc_thread_t objc_thread_id(void);
-
- /*
- Use this to set the hook function that will be called when the
- runtime initially becomes multi threaded.
- The hook function is only called once, meaning only when the
- 2nd thread is spawned, not for each and every thread.
-
- It returns the previous hook function or NULL if there is none.
-
- A program outside of the runtime could set this to some function so
- it can be informed; for example, the GNUstep Base Library sets it
- so it can implement the NSBecomingMultiThreaded notification.
- */
- typedef void (*objc_thread_callback)();
- objc_thread_callback objc_set_thread_callback(objc_thread_callback func);
-
- /* Backend initialization functions */
- int __objc_init_thread_system(void);
- int __objc_fini_thread_system(void);
-
- /* Backend mutex functions */
- int __objc_mutex_allocate(objc_mutex_t mutex);
- int __objc_mutex_deallocate(objc_mutex_t mutex);
- int __objc_mutex_lock(objc_mutex_t mutex);
- int __objc_mutex_trylock(objc_mutex_t mutex);
- int __objc_mutex_unlock(objc_mutex_t mutex);
-
- /* Backend condition mutex functions */
- int __objc_condition_allocate(objc_condition_t condition);
- int __objc_condition_deallocate(objc_condition_t condition);
- int __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex);
- int __objc_condition_broadcast(objc_condition_t condition);
- int __objc_condition_signal(objc_condition_t condition);
-
- /* Backend thread functions */
- objc_thread_t __objc_thread_detach(void (*func)(void *arg), void *arg);
- int __objc_thread_set_priority(int priority);
- int __objc_thread_get_priority(void);
- void __objc_thread_yield(void);
- int __objc_thread_exit(void);
- objc_thread_t __objc_thread_id(void);
- int __objc_thread_set_data(void *value);
- void * __objc_thread_get_data(void);
-
- #endif /* not __thread_INCLUDE_GNU */
-