1/* 2 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org> 3 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the author nor the names of any co-contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * $FreeBSD$ 31 */ 32 33#include "namespace.h" 34#include <errno.h> 35#include <pthread.h> 36#include "un-namespace.h" 37#include "thr_private.h" 38 39/* 40 * Find a thread in the linked list of active threads and add a reference 41 * to it. Threads with positive reference counts will not be deallocated 42 * until all references are released. 43 */ 44int 45_thr_ref_add(struct pthread *curthread, struct pthread *thread, 46 int include_dead) 47{ 48 kse_critical_t crit; 49 struct pthread *pthread; 50 struct kse *curkse; 51 52 if (thread == NULL) 53 /* Invalid thread: */ 54 return (EINVAL); 55 56 crit = _kse_critical_enter(); 57 curkse = _get_curkse(); 58 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock); 59 pthread = _thr_hash_find(thread); 60 if (pthread) { 61 if ((include_dead == 0) && 62 ((pthread->state == PS_DEAD) || 63 ((pthread->state == PS_DEADLOCK) || 64 ((pthread->flags & THR_FLAGS_EXITING) != 0)))) 65 pthread = NULL; 66 else { 67 pthread->refcount++; 68 if (curthread != NULL) 69 curthread->critical_count++; 70 } 71 } 72 KSE_LOCK_RELEASE(curkse, &_thread_list_lock); 73 _kse_critical_leave(crit); 74 75 /* Return zero if the thread exists: */ 76 return ((pthread != NULL) ? 0 : ESRCH); 77} 78 79void 80_thr_ref_delete(struct pthread *curthread, struct pthread *thread) 81{ 82 kse_critical_t crit; 83 struct kse *curkse; 84 85 if (thread != NULL) { 86 crit = _kse_critical_enter(); 87 curkse = _get_curkse(); 88 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock); 89 thread->refcount--; 90 if (curthread != NULL) 91 curthread->critical_count--; 92 if ((thread->refcount == 0) && 93 (thread->tlflags & TLFLAGS_GC_SAFE) != 0) 94 THR_GCLIST_ADD(thread); 95 KSE_LOCK_RELEASE(curkse, &_thread_list_lock); 96 _kse_critical_leave(crit); 97 } 98} 99