diff options
Diffstat (limited to 'lib/libpthread/thread/thr_resume_np.c')
| -rw-r--r-- | lib/libpthread/thread/thr_resume_np.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libpthread/thread/thr_resume_np.c b/lib/libpthread/thread/thr_resume_np.c new file mode 100644 index 0000000..70c5f17 --- /dev/null +++ b/lib/libpthread/thread/thr_resume_np.c @@ -0,0 +1,112 @@ +/* + * Copyright (c) 1995 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 struct kse_mailbox *resume_common(struct pthread *); + +LT10_COMPAT_PRIVATE(_pthread_resume_np); +LT10_COMPAT_DEFAULT(pthread_resume_np); +LT10_COMPAT_PRIVATE(_pthread_resume_all_np); +LT10_COMPAT_DEFAULT(pthread_resume_all_np); + +__weak_reference(_pthread_resume_np, pthread_resume_np); +__weak_reference(_pthread_resume_all_np, pthread_resume_all_np); + + +/* Resume a thread: */ +int +_pthread_resume_np(pthread_t thread) +{ + struct pthread *curthread = _get_curthread(); + struct kse_mailbox *kmbx; + int ret; + + /* Add a reference to the thread: */ + if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) { + /* Lock the threads scheduling queue: */ + THR_SCHED_LOCK(curthread, thread); + kmbx = resume_common(thread); + THR_SCHED_UNLOCK(curthread, thread); + _thr_ref_delete(curthread, thread); + if (kmbx != NULL) + kse_wakeup(kmbx); + } + return (ret); +} + +void +_pthread_resume_all_np(void) +{ + struct pthread *curthread = _get_curthread(); + struct pthread *thread; + struct kse_mailbox *kmbx; + 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); + kmbx = resume_common(thread); + THR_SCHED_UNLOCK(curthread, thread); + if (kmbx != NULL) + kse_wakeup(kmbx); + } + } + + /* Release the thread list lock: */ + KSE_LOCK_RELEASE(curthread->kse, &_thread_list_lock); + _kse_critical_leave(crit); +} + +static struct kse_mailbox * +resume_common(struct pthread *thread) +{ + /* Clear the suspend flag: */ + thread->flags &= ~THR_FLAGS_SUSPENDED; + + /* + * If the thread's state is suspended, that means it is + * now runnable but not in any scheduling queue. Set the + * state to running and insert it into the run queue. + */ + if (thread->state == PS_SUSPENDED) + return (_thr_setrunnable_unlocked(thread)); + else + return (NULL); +} |
