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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by John Birrell.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $DragonFly: src/lib/libthread_xu/thread/thr_resume_np.c,v 1.5 2006/04/06 13:03:09 davidxu Exp $
  33  */
  34
  35 #include "namespace.h"
  36 #include <machine/tls.h>
  37
  38 #include <errno.h>
  39 #include <pthread.h>
  40 #include <pthread_np.h>
  41 #include "un-namespace.h"
  42 #include "thr_private.h"
  43
  44 static void resume_common(struct pthread *thread);
  45
  46 /* Resume a thread: */
  47 int
  48 _pthread_resume_np(pthread_t thread)
  49 {
  50         struct pthread *curthread = tls_get_curthread();
  51         int ret;
  52
  53         /* Add a reference to the thread: */
  54         if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) == 0) {
  55                 /* Lock the threads scheduling queue: */
  56                 THR_THREAD_LOCK(curthread, thread);
  57                 resume_common(thread);
  58                 THR_THREAD_UNLOCK(curthread, thread);
  59                 _thr_ref_delete(curthread, thread);
  60         }
  61         return (ret);
  62 }
  63
  64 void
  65 _pthread_resume_all_np(void)
  66 {
  67         struct pthread *curthread = tls_get_curthread();
  68         struct pthread *thread;
  69
  70         /* Take the thread list lock: */
  71         THREAD_LIST_LOCK(curthread);
  72
  73         TAILQ_FOREACH(thread, &_thread_list, tle) {
  74                 if (thread != curthread) {
  75                         THR_THREAD_LOCK(curthread, thread);
  76                         resume_common(thread);
  77                         THR_THREAD_UNLOCK(curthread, thread);
  78                 }
  79         }
  80
  81         /* Release the thread list lock: */
  82         THREAD_LIST_UNLOCK(curthread);
  83 }
  84
  85 static void
  86 resume_common(struct pthread *thread)
  87 {
  88         /* Clear the suspend flag: */
  89         thread->flags &= ~THR_FLAGS_NEED_SUSPEND;
  90         thread->cycle++;
  91         _thr_umtx_wake(&thread->cycle, 1);
  92 }
  93
  94 __strong_reference(_pthread_resume_np, pthread_resume_np);
  95 __strong_reference(_pthread_resume_all_np, pthread_resume_all_np);
  96