diff options
Diffstat (limited to 'lib/libthr/thread/thr_resume_np.c')
-rw-r--r-- | lib/libthr/thread/thr_resume_np.c | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_resume_np.c b/lib/libthr/thread/thr_resume_np.c new file mode 100644 index 000000000000..c5669fd4f0ff --- /dev/null +++ b/lib/libthr/thread/thr_resume_np.c @@ -0,0 +1,97 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. 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. + */ + +#include "namespace.h" +#include <errno.h> +#include <pthread.h> +#include <pthread_np.h> +#include "un-namespace.h" + +#include "thr_private.h" + +__weak_reference(_pthread_resume_np, pthread_resume_np); +__weak_reference(_thr_resume_all_np, pthread_resume_all_np); +__weak_reference(_thr_resume_all_np, _pthread_resume_all_np); + +static void resume_common(struct pthread *thread); + +/* Resume a thread: */ +int +_pthread_resume_np(pthread_t thread) +{ + struct pthread *curthread = _get_curthread(); + int ret; + + /* Add a reference to the thread: */ + if ((ret = _thr_find_thread(curthread, thread, /*include dead*/0)) == 0) { + /* Lock the threads scheduling queue: */ + resume_common(thread); + THR_THREAD_UNLOCK(curthread, thread); + } + return (ret); +} + +void +_thr_resume_all_np(void) +{ + struct pthread *curthread = _get_curthread(); + struct pthread *thread; + int old_nocancel; + + old_nocancel = curthread->no_cancel; + curthread->no_cancel = 1; + _thr_suspend_all_lock(curthread); + /* Take the thread list lock: */ + THREAD_LIST_RDLOCK(curthread); + + TAILQ_FOREACH(thread, &_thread_list, tle) { + if (thread != curthread) { + THR_THREAD_LOCK(curthread, thread); + resume_common(thread); + THR_THREAD_UNLOCK(curthread, thread); + } + } + + /* Release the thread list lock: */ + THREAD_LIST_UNLOCK(curthread); + _thr_suspend_all_unlock(curthread); + curthread->no_cancel = old_nocancel; + _thr_testcancel(curthread); +} + +static void +resume_common(struct pthread *thread) +{ + /* Clear the suspend flag: */ + thread->flags &= ~(THR_FLAGS_NEED_SUSPEND | THR_FLAGS_SUSPENDED); + thread->cycle++; + _thr_umtx_wake(&thread->cycle, 1, 0); +} |