lib/libthread_xu/thread/thr_resume_np.c

   1 /*
   2  * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  */
  30
  31 #include "namespace.h"
  32 #include <machine/tls.h>
  33 #include <errno.h>
  34 #include <pthread.h>
  35 #include <pthread_np.h>
  36 #include "un-namespace.h"
  37
  38 #include "thr_private.h"
  39
  40 static void resume_common(pthread_t thread);
  41
  42 /* Resume a thread: */
  43 int
  44 _pthread_resume_np(pthread_t thread)
  45 {
  46         pthread_t curthread = tls_get_curthread();
  47         int ret;
  48
  49         /* Add a reference to the thread: */
  50         if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) {
  51                 /* Lock the threads scheduling queue: */
  52                 THR_THREAD_LOCK(curthread, thread);
  53                 resume_common(thread);
  54                 THR_THREAD_UNLOCK(curthread, thread);
  55                 _thr_ref_delete(curthread, thread);
  56         }
  57         return (ret);
  58 }
  59
  60 void
  61 _pthread_resume_all_np(void)
  62 {
  63         pthread_t curthread = tls_get_curthread();
  64         pthread_t thread;
  65
  66         /* Take the thread list lock: */
  67         THREAD_LIST_LOCK(curthread);
  68
  69         TAILQ_FOREACH(thread, &_thread_list, tle) {
  70                 if (thread != curthread) {
  71                         THR_THREAD_LOCK(curthread, thread);
  72                         resume_common(thread);
  73                         THR_THREAD_UNLOCK(curthread, thread);
  74                 }
  75         }
  76
  77         /* Release the thread list lock: */
  78         THREAD_LIST_UNLOCK(curthread);
  79 }
  80
  81 static void
  82 resume_common(pthread_t thread)
  83 {
  84         /* Clear the suspend flag: */
  85         thread->flags &= ~THR_FLAGS_NEED_SUSPEND;
  86         thread->cycle++;
  87         _thr_umtx_wake(&thread->cycle, 1);
  88 }
  89
  90 __strong_reference(_pthread_resume_np, pthread_resume_np);
  91 __strong_reference(_pthread_resume_all_np, pthread_resume_all_np);