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 
97