diff options
Diffstat (limited to 'lib/libpthread/thread/thr_suspend_np.c')
| -rw-r--r-- | lib/libpthread/thread/thr_suspend_np.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_suspend_np.c b/lib/libpthread/thread/thr_suspend_np.c new file mode 100644 index 0000000..16c129c --- /dev/null +++ b/lib/libpthread/thread/thr_suspend_np.c @@ -0,0 +1,114 @@ +/* + * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include <errno.h> +#include <pthread.h> +#include "thr_private.h" + +static void suspend_common(struct pthread *thread); + +LT10_COMPAT_PRIVATE(_pthread_suspend_np); +LT10_COMPAT_DEFAULT(pthread_suspend_np); +LT10_COMPAT_PRIVATE(_pthread_suspend_all_np); +LT10_COMPAT_DEFAULT(pthread_suspend_all_np); + +__weak_reference(_pthread_suspend_np, pthread_suspend_np); +__weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np); + +/* Suspend a thread: */ +int +_pthread_suspend_np(pthread_t thread) +{ + struct pthread *curthread = _get_curthread(); + int ret; + + /* Suspending the current thread doesn't make sense. */ + if (thread == _get_curthread()) + ret = EDEADLK; + + /* Add a reference to the thread: */ + else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) + == 0) { + /* Lock the threads scheduling queue: */ + THR_SCHED_LOCK(curthread, thread); + suspend_common(thread); + /* Unlock the threads scheduling queue: */ + THR_SCHED_UNLOCK(curthread, thread); + + /* Don't forget to remove the reference: */ + _thr_ref_delete(curthread, thread); + } + return (ret); +} + +void +_pthread_suspend_all_np(void) +{ + struct pthread *curthread = _get_curthread(); + struct pthread *thread; + kse_critical_t crit; + + /* Take the thread list lock: */ + crit = _kse_critical_enter(); + KSE_LOCK_ACQUIRE(curthread->kse, &_thread_list_lock); + + TAILQ_FOREACH(thread, &_thread_list, tle) { + if (thread != curthread) { + THR_SCHED_LOCK(curthread, thread); + suspend_common(thread); + THR_SCHED_UNLOCK(curthread, thread); + } + } + + /* Release the thread list lock: */ + KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock); + _kse_critical_leave(crit); +} + +void +suspend_common(struct pthread *thread) +{ + if ((thread->state != PS_DEAD) && + (thread->state != PS_DEADLOCK) && + ((thread->flags & THR_FLAGS_EXITING) == 0)) { + thread->flags |= THR_FLAGS_SUSPENDED; + if ((thread->flags & THR_FLAGS_IN_RUNQ) != 0) { + THR_RUNQ_REMOVE(thread); + THR_SET_STATE(thread, PS_SUSPENDED); + } +#ifdef NOT_YET + if ((thread->attr.flags & PTHREAD_SCOPE_SYSTEM) != 0) + /* ??? */ +#endif + } +} |
