thr_find_thread.c revision 48046
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 * $Id$ 33 */ 34#include <errno.h> 35#ifdef _THREAD_SAFE 36#include <pthread.h> 37#include "pthread_private.h" 38 39/* Find a thread in the linked list of active threads: */ 40int 41_find_thread(pthread_t pthread) 42{ 43 pthread_t pthread1; 44 45 /* Check if the caller has specified an invalid thread: */ 46 if (pthread == NULL || pthread->magic != PTHREAD_MAGIC) 47 /* Invalid thread: */ 48 return(EINVAL); 49 50 /* 51 * Defer signals to protect the thread list from access 52 * by the signal handler: 53 */ 54 _thread_kern_sig_defer(); 55 56 /* Search for the specified thread: */ 57 TAILQ_FOREACH(pthread1, &_thread_list, tle) { 58 if (pthread == pthread1) 59 break; 60 } 61 62 /* Undefer and handle pending signals, yielding if necessary: */ 63 _thread_kern_sig_undefer(); 64 65 /* Return zero if the thread exists: */ 66 return ((pthread1 != NULL) ? 0:ESRCH); 67} 68 69/* Find a thread in the linked list of dead threads: */ 70int 71_find_dead_thread(pthread_t pthread) 72{ 73 pthread_t pthread1; 74 75 /* Check if the caller has specified an invalid thread: */ 76 if (pthread == NULL || pthread->magic != PTHREAD_MAGIC) 77 /* Invalid thread: */ 78 return(EINVAL); 79 80 /* 81 * Lock the garbage collector mutex to ensure that the garbage 82 * collector is not using the dead thread list. 83 */ 84 if (pthread_mutex_lock(&_gc_mutex) != 0) 85 PANIC("Cannot lock gc mutex"); 86 87 /* Search for the specified thread: */ 88 TAILQ_FOREACH(pthread1, &_dead_list, dle) { 89 if (pthread1 == pthread) 90 break; 91 } 92 93 /* Unlock the garbage collector mutex: */ 94 if (pthread_mutex_unlock(&_gc_mutex) != 0) 95 PANIC("Cannot lock gc mutex"); 96 97 /* Return zero if the thread exists: */ 98 return ((pthread1 != NULL) ? 0:ESRCH); 99} 100#endif 101