int
_pthread_getschedparam(pthread_t pthread, int *policy, 
	struct sched_param *param)
{
	struct pthread *curthread = _get_curthread();
	int ret;

	if (policy == NULL || param == NULL)
		return (EINVAL);

	if (pthread == curthread) {
		/*
		 * Avoid searching the thread list when it is the current
		 * thread.
		 */
		THR_LOCK(curthread);
		*policy = curthread->attr.sched_policy;
		param->sched_priority = curthread->attr.prio;
		THR_UNLOCK(curthread);
		ret = 0;
	}
	/* Find the thread in the list of active threads. */
	else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
	    == 0) {
		THR_THREAD_LOCK(curthread, pthread);
		*policy = pthread->attr.sched_policy;
		param->sched_priority = pthread->attr.prio;
		THR_THREAD_UNLOCK(curthread, pthread);
		_thr_ref_delete(curthread, pthread);
	}
	return (ret);
}
Beispiel #2
0
static void
thread_start(struct pthread *curthread)
{
	sigset_t set;

	if (curthread->attr.suspend == THR_CREATE_SUSPENDED)
		set = curthread->sigmask;

	/*
	 * This is used as a serialization point to allow parent
	 * to report 'new thread' event to debugger or tweak new thread's
	 * attributes before the new thread does real-world work.
	 */
	THR_LOCK(curthread);
	THR_UNLOCK(curthread);

	if (curthread->force_exit)
		_pthread_exit(PTHREAD_CANCELED);

	if (curthread->attr.suspend == THR_CREATE_SUSPENDED) {
#if 0
		/* Done in THR_UNLOCK() */
		_thr_ast(curthread);
#endif

		/*
		 * Parent thread have stored signal mask for us,
		 * we should restore it now.
		 */
		__sys_sigprocmask(SIG_SETMASK, &set, NULL);
	}

#ifdef _PTHREAD_FORCED_UNWIND
	curthread->unwind_stackend = (char *)curthread->attr.stackaddr_attr +
		curthread->attr.stacksize_attr;
#endif

	/* Run the current thread's start routine with argument: */
	_pthread_exit(curthread->start_routine(curthread->arg));

	/* This point should never be reached. */
	PANIC("Thread has resumed after exit");
}
Beispiel #3
0
static void
thread_start(void *arg)
{
	struct pthread *curthread = (struct pthread *)arg;

	tls_set_tcb(curthread->tcb);

	/* Thread was created with all signals blocked, unblock them. */
	__sys_sigprocmask(SIG_SETMASK, &curthread->sigmask, NULL);

	THR_LOCK(curthread);
	THR_UNLOCK(curthread);

	if (curthread->flags & THR_FLAGS_NEED_SUSPEND)
		_thr_suspend_check(curthread);
	_nmalloc_thr_init();

	/* Run the current thread's start routine with argument: */
	_pthread_exit(curthread->start_routine(curthread->arg));

	/* This point should never be reached. */
	PANIC("Thread has resumed after exit");
}
Beispiel #4
0
int
_pthread_create(pthread_t * thread, const pthread_attr_t * attr,
    void *(*start_routine) (void *), void *arg)
{
	struct lwp_params create_params;
	void *stack;
	sigset_t sigmask, oldsigmask;
	struct pthread *curthread, *new_thread;
	int ret = 0, locked;

	_thr_check_init();

	/*
	 * Tell libc and others now they need lock to protect their data.
	 */
	if (_thr_isthreaded() == 0 && _thr_setthreaded(1))
		return (EAGAIN);

	curthread = tls_get_curthread();
	if ((new_thread = _thr_alloc(curthread)) == NULL)
		return (EAGAIN);

	if (attr == NULL || *attr == NULL) {
		/* Use the default thread attributes: */
		new_thread->attr = _pthread_attr_default;
	} else {
		new_thread->attr = *(*attr);
	}
	if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
		/* inherit scheduling contention scope */
		if (curthread->attr.flags & PTHREAD_SCOPE_SYSTEM)
			new_thread->attr.flags |= PTHREAD_SCOPE_SYSTEM;
		else
			new_thread->attr.flags &= ~PTHREAD_SCOPE_SYSTEM;
		/*
		 * scheduling policy and scheduling parameters will be
		 * inherited in following code.
		 */
	}

	if (create_stack(&new_thread->attr) != 0) {
		/* Insufficient memory to create a stack: */
		new_thread->terminated = 1;
		_thr_free(curthread, new_thread);
		return (EAGAIN);
	}
	/*
	 * Write a magic value to the thread structure
	 * to help identify valid ones:
	 */
	new_thread->magic = THR_MAGIC;
	new_thread->start_routine = start_routine;
	new_thread->arg = arg;
	new_thread->cancelflags = PTHREAD_CANCEL_ENABLE |
	    PTHREAD_CANCEL_DEFERRED;
	/*
	 * Check if this thread is to inherit the scheduling
	 * attributes from its parent:
	 */
	if (new_thread->attr.sched_inherit == PTHREAD_INHERIT_SCHED) {
		/*
		 * Copy the scheduling attributes. Lock the scheduling
		 * lock to get consistent scheduling parameters.
		 */
		THR_LOCK(curthread);
		new_thread->base_priority = curthread->base_priority;
		new_thread->attr.prio = curthread->attr.prio;
		new_thread->attr.sched_policy = curthread->attr.sched_policy;
		THR_UNLOCK(curthread);
	} else {
		/*
		 * Use just the thread priority, leaving the
		 * other scheduling attributes as their
		 * default values:
		 */
		new_thread->base_priority = new_thread->attr.prio;
	}
	new_thread->active_priority = new_thread->base_priority;

	/* Initialize the mutex queue: */
	TAILQ_INIT(&new_thread->mutexq);

	/* Initialise hooks in the thread structure: */
	if (new_thread->attr.suspend == THR_CREATE_SUSPENDED)
		new_thread->flags = THR_FLAGS_NEED_SUSPEND;

	new_thread->state = PS_RUNNING;

	if (new_thread->attr.flags & PTHREAD_CREATE_DETACHED)
		new_thread->tlflags |= TLFLAGS_DETACHED;

	/* Add the new thread. */
	new_thread->refcount = 1;
	_thr_link(curthread, new_thread);
	/* Return thread pointer eariler so that new thread can use it. */
	(*thread) = new_thread;
	if (SHOULD_REPORT_EVENT(curthread, TD_CREATE)) {
		THR_THREAD_LOCK(curthread, new_thread);
		locked = 1;
	} else
		locked = 0;
	/* Schedule the new thread. */
	stack = (char *)new_thread->attr.stackaddr_attr +
			new_thread->attr.stacksize_attr;
	bzero(&create_params, sizeof(create_params));
	create_params.lwp_func = thread_start;
	create_params.lwp_arg = new_thread;
	create_params.lwp_stack = stack;
	create_params.lwp_tid1 = &new_thread->tid;
	/*
	 * Thread created by thr_create() inherits currrent thread
	 * sigmask, however, before new thread setup itself correctly,
	 * it can not handle signal, so we should mask all signals here.
	 * We do this at the very last moment, so that we don't run
	 * into problems while we have all signals disabled.
	 */
	SIGFILLSET(sigmask);
	__sys_sigprocmask(SIG_SETMASK, &sigmask, &oldsigmask);
	new_thread->sigmask = oldsigmask;
	ret = lwp_create(&create_params);
	__sys_sigprocmask(SIG_SETMASK, &oldsigmask, NULL);
	if (ret != 0) {
		if (!locked)
			THR_THREAD_LOCK(curthread, new_thread);
		new_thread->state = PS_DEAD;
		new_thread->terminated = 1;
		if (new_thread->flags & THR_FLAGS_NEED_SUSPEND) {
			new_thread->cycle++;
			_thr_umtx_wake(&new_thread->cycle, INT_MAX);
		}
		THR_THREAD_UNLOCK(curthread, new_thread);
		THREAD_LIST_LOCK(curthread);
		_thread_active_threads--;
		new_thread->tlflags |= TLFLAGS_DETACHED;
		_thr_ref_delete_unlocked(curthread, new_thread);
		THREAD_LIST_UNLOCK(curthread);
		(*thread) = NULL;
		ret = EAGAIN;
	} else if (locked) {
		_thr_report_creation(curthread, new_thread);
		THR_THREAD_UNLOCK(curthread, new_thread);
	}
	return (ret);
}
Beispiel #5
0
void
_pthread_exit(void *status)
{
	struct pthread *curthread = _get_curthread();

	/* Check if this thread is already in the process of exiting: */
	if (curthread->cancelling) {
		char msg[128];
		snprintf(msg, sizeof(msg), "Thread %p has called "
		    "pthread_exit() from a destructor. POSIX 1003.1 "
		    "1996 s16.2.5.2 does not allow this!", curthread);
		PANIC(msg);
	}

	/* Flag this thread as exiting. */
	curthread->cancelling = 1;
	
	_thr_exit_cleanup();

	/* Save the return value: */
	curthread->ret = status;
	while (curthread->cleanup != NULL) {
		_pthread_cleanup_pop(1);
	}

	/* Check if there is thread specific data: */
	if (curthread->specific != NULL) {
		/* Run the thread-specific data destructors: */
		_thread_cleanupspecific();
	}

	if (!_thr_isthreaded())
		exit(0);

	THREAD_LIST_LOCK(curthread);
	_thread_active_threads--;
	if (_thread_active_threads == 0) {
		THREAD_LIST_UNLOCK(curthread);
		exit(0);
		/* Never reach! */
	}
	THREAD_LIST_UNLOCK(curthread);

	/* Tell malloc that the thread is exiting. */
	_malloc_thread_cleanup();

	THREAD_LIST_LOCK(curthread);
	THR_LOCK(curthread);
	curthread->state = PS_DEAD;
	if (curthread->flags & THR_FLAGS_NEED_SUSPEND) {
		curthread->cycle++;
		_thr_umtx_wake(&curthread->cycle, INT_MAX, 0);
	}
	THR_UNLOCK(curthread);
	/*
	 * Thread was created with initial refcount 1, we drop the
	 * reference count to allow it to be garbage collected.
	 */
	curthread->refcount--;
	if (curthread->tlflags & TLFLAGS_DETACHED)
		THR_GCLIST_ADD(curthread);
	THREAD_LIST_UNLOCK(curthread);
	if (!curthread->force_exit && SHOULD_REPORT_EVENT(curthread, TD_DEATH))
		_thr_report_death(curthread);

	/*
	 * Kernel will do wakeup at the address, so joiner thread
	 * will be resumed if it is sleeping at the address.
	 */
	thr_exit(&curthread->tid);
#ifndef __AVM2__ // might exit if we're impersonating another thread!
	PANIC("thr_exit() returned");
#endif
	/* Never reach! */
}