diff options
Diffstat (limited to 'lib/libpthread/thread/thr_resume_np.c')
| -rw-r--r-- | lib/libpthread/thread/thr_resume_np.c | 92 |
1 files changed, 92 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..32b3d05 --- /dev/null +++ b/lib/libpthread/thread/thr_resume_np.c @@ -0,0 +1,92 @@ +/* + * 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> +#ifdef _THREAD_SAFE +#include <pthread.h> +#include "pthread_private.h" + +/* Resume a thread: */ +int +pthread_resume_np(pthread_t thread) +{ + int ret; + enum pthread_susp old_suspended; + + /* Find the thread in the list of active threads: */ + if ((ret = _find_thread(thread)) == 0) { + /* Cancel any pending suspensions: */ + old_suspended = thread->suspended; + thread->suspended = SUSP_NO; + + /* Is it currently suspended? */ + if (thread->state == PS_SUSPENDED) { + /* + * Defer signals to protect the scheduling queues + * from access by the signal handler: + */ + _thread_kern_sig_defer(); + + switch (old_suspended) { + case SUSP_MUTEX_WAIT: + /* Set the thread's state back. */ + PTHREAD_SET_STATE(thread,PS_MUTEX_WAIT); + break; + case SUSP_COND_WAIT: + /* Set the thread's state back. */ + PTHREAD_SET_STATE(thread,PS_COND_WAIT); + break; + case SUSP_NOWAIT: + /* Allow the thread to run. */ + PTHREAD_SET_STATE(thread,PS_RUNNING); + PTHREAD_WAITQ_REMOVE(thread); + PTHREAD_PRIOQ_INSERT_TAIL(thread); + break; + case SUSP_NO: + case SUSP_YES: + /* Allow the thread to run. */ + PTHREAD_SET_STATE(thread,PS_RUNNING); + PTHREAD_PRIOQ_INSERT_TAIL(thread); + break; + } + + /* + * Undefer and handle pending signals, yielding if + * necessary: + */ + _thread_kern_sig_undefer(); + } + } + return(ret); +} +#endif |
