282 lines
6.4 KiB
C
282 lines
6.4 KiB
C
/* GNU Objective C Runtime Thread Interface
|
|
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.
|
|
|
|
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. */
|
|
|
|
#include <pthread.h>
|
|
#include <objc/thr.h>
|
|
#include "runtime.h"
|
|
|
|
/* Key structure for maintaining thread specific storage */
|
|
static pthread_key_t _objc_thread_storage;
|
|
|
|
/* Backend initialization functions */
|
|
|
|
/* Initialize the threads subsystem. */
|
|
int
|
|
__objc_init_thread_system(void)
|
|
{
|
|
/* Initialize the thread storage key */
|
|
return pthread_keycreate(&_objc_thread_storage, NULL);
|
|
}
|
|
|
|
/* Close the threads subsystem. */
|
|
int
|
|
__objc_close_thread_system(void)
|
|
{
|
|
/* Destroy the thread storage key */
|
|
/* Not implemented yet */
|
|
/* return pthread_key_delete(&_objc_thread_storage); */
|
|
return 0;
|
|
}
|
|
|
|
/* Backend thread functions */
|
|
|
|
/* Create a new thread of execution. */
|
|
objc_thread_t
|
|
__objc_thread_detach(void (*func)(void *arg), void *arg)
|
|
{
|
|
objc_thread_t thread_id;
|
|
pthread_t new_thread_handle;
|
|
|
|
if (pthread_create(&new_thread_handle, pthread_attr_default,
|
|
(void *)func, arg) == 0)
|
|
{
|
|
/* ??? May not work! (64bit) */
|
|
thread_id = *(objc_thread_t *)&new_thread_handle;
|
|
pthread_detach(&new_thread_handle); /* Fully detach thread. */
|
|
}
|
|
else
|
|
thread_id = NULL;
|
|
|
|
return thread_id;
|
|
}
|
|
|
|
/* Set the current thread's priority. */
|
|
int
|
|
__objc_thread_set_priority(int priority)
|
|
{
|
|
int sys_priority = 0;
|
|
|
|
switch (priority)
|
|
{
|
|
case OBJC_THREAD_INTERACTIVE_PRIORITY:
|
|
sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
|
|
break;
|
|
default:
|
|
case OBJC_THREAD_BACKGROUND_PRIORITY:
|
|
sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
|
|
break;
|
|
case OBJC_THREAD_LOW_PRIORITY:
|
|
sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
|
|
break;
|
|
}
|
|
|
|
/* Change the priority. */
|
|
if (pthread_setprio(pthread_self(), sys_priority) >= 0)
|
|
return 0;
|
|
else
|
|
/* Failed */
|
|
return -1;
|
|
}
|
|
|
|
/* Return the current thread's priority. */
|
|
int
|
|
__objc_thread_get_priority(void)
|
|
{
|
|
int sys_priority;
|
|
|
|
if ((sys_priority = pthread_getprio(pthread_self())) >= 0) {
|
|
if (sys_priority >= PRI_FG_MIN_NP && sys_priority <= PRI_FG_MAX_NP)
|
|
return OBJC_THREAD_INTERACTIVE_PRIORITY;
|
|
if (sys_priority >= PRI_BG_MIN_NP && sys_priority <= PRI_BG_MAX_NP)
|
|
return OBJC_THREAD_BACKGROUND_PRIORITY;
|
|
return OBJC_THREAD_LOW_PRIORITY;
|
|
}
|
|
|
|
/* Failed */
|
|
return -1;
|
|
}
|
|
|
|
/* Yield our process time to another thread. */
|
|
void
|
|
__objc_thread_yield(void)
|
|
{
|
|
pthread_yield();
|
|
}
|
|
|
|
/* Terminate the current thread. */
|
|
int
|
|
__objc_thread_exit(void)
|
|
{
|
|
/* exit the thread */
|
|
pthread_exit(&__objc_thread_exit_status);
|
|
|
|
/* Failed if we reached here */
|
|
return -1;
|
|
}
|
|
|
|
/* Returns an integer value which uniquely describes a thread. */
|
|
objc_thread_t
|
|
__objc_thread_id(void)
|
|
{
|
|
pthread_t self = pthread_self();
|
|
|
|
return (objc_thread_t) pthread_getunique_np (&self);
|
|
}
|
|
|
|
/* Sets the thread's local storage pointer. */
|
|
int
|
|
__objc_thread_set_data(void *value)
|
|
{
|
|
return pthread_setspecific(_objc_thread_storage, value);
|
|
}
|
|
|
|
/* Returns the thread's local storage pointer. */
|
|
void *
|
|
__objc_thread_get_data(void)
|
|
{
|
|
void *value = NULL;
|
|
|
|
if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
|
|
return value;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/* Backend mutex functions */
|
|
|
|
/* Allocate a mutex. */
|
|
int
|
|
__objc_mutex_allocate(objc_mutex_t mutex)
|
|
{
|
|
if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)),
|
|
pthread_mutexattr_default))
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Deallocate a mutex. */
|
|
int
|
|
__objc_mutex_deallocate(objc_mutex_t mutex)
|
|
{
|
|
if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Grab a lock on a mutex. */
|
|
int
|
|
__objc_mutex_lock(objc_mutex_t mutex)
|
|
{
|
|
return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
|
|
}
|
|
|
|
/* Try to grab a lock on a mutex. */
|
|
int
|
|
__objc_mutex_trylock(objc_mutex_t mutex)
|
|
{
|
|
if (pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend))) != 1)
|
|
return -1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
/* Unlock the mutex */
|
|
int
|
|
__objc_mutex_unlock(objc_mutex_t mutex)
|
|
{
|
|
return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
|
|
}
|
|
|
|
/* Backend condition mutex functions */
|
|
|
|
/* Allocate a condition. */
|
|
int
|
|
__objc_condition_allocate(objc_condition_t condition)
|
|
{
|
|
/* Unimplemented. */
|
|
return -1;
|
|
|
|
/*
|
|
if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
|
|
return -1;
|
|
else
|
|
return 0;
|
|
*/
|
|
}
|
|
|
|
/* Deallocate a condition. */
|
|
int
|
|
__objc_condition_deallocate(objc_condition_t condition)
|
|
{
|
|
/* Unimplemented. */
|
|
return -1;
|
|
|
|
/*
|
|
return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
|
|
*/
|
|
}
|
|
|
|
/* Wait on the condition */
|
|
int
|
|
__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
|
|
{
|
|
/* Unimplemented. */
|
|
return -1;
|
|
|
|
/*
|
|
return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
|
|
(pthread_mutex_t *)(&(mutex->backend)));
|
|
*/
|
|
}
|
|
|
|
/* Wake up all threads waiting on this condition. */
|
|
int
|
|
__objc_condition_broadcast(objc_condition_t condition)
|
|
{
|
|
/* Unimplemented. */
|
|
return -1;
|
|
|
|
/*
|
|
return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
|
|
*/
|
|
}
|
|
|
|
/* Wake up one thread waiting on this condition. */
|
|
int
|
|
__objc_condition_signal(objc_condition_t condition)
|
|
{
|
|
/* Unimplemented. */
|
|
return -1;
|
|
|
|
/*
|
|
return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
|
|
*/
|
|
}
|
|
|
|
/* End of File */
|