thr_find_thread.c revision 35509 
1/*
2 * Copyright (c) 1998 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 REGENTS 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 */
33#include <errno.h>
34#ifdef _THREAD_SAFE
35#include <pthread.h>
36#include "pthread_private.h"
37
38/* Find a thread in the linked list of active threads: */
39int
40_find_thread(pthread_t pthread)
41{
42	pthread_t pthread1;
43
44	/* Check if the caller has specified an invalid thread: */
45	if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
46		/* Invalid thread: */
47		return(EINVAL);
48
49	/* Lock the thread list: */
50	_lock_thread_list();
51
52	/* Point to the first thread in the list: */
53	pthread1 = _thread_link_list;
54
55	/* Search for the thread to join to: */
56	while (pthread1 != NULL && pthread1 != pthread) {
57		/* Point to the next thread: */
58		pthread1 = pthread1->nxt;
59	}
60
61	/* Unlock the thread list: */
62	_unlock_thread_list();
63
64	/* Return zero if the thread exists: */
65	return ((pthread1 != NULL) ? 0:ESRCH);
66}
67
68/* Find a thread in the linked list of dead threads: */
69int
70_find_dead_thread(pthread_t pthread)
71{
72	pthread_t pthread1;
73
74	/* Check if the caller has specified an invalid thread: */
75	if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
76		/* Invalid thread: */
77		return(EINVAL);
78
79	/* Lock the dead thread list: */
80	_lock_dead_thread_list();
81
82	/* Point to the first thread in the list: */
83	pthread1 = _thread_dead;
84
85	/* Search for the thread to join to: */
86	while (pthread1 != NULL && pthread1 != pthread) {
87		/* Point to the next thread: */
88		pthread1 = pthread1->nxt;
89	}
90
91	/* Unlock the dead thread list: */
92	_unlock_dead_thread_list();
93
94	/* Return zero if the thread exists: */
95	return ((pthread1 != NULL) ? 0:ESRCH);
96}
97#endif
98