2 * Copyright (c) 2003 Daniel Eischen <deischen@freebsd.org>
3 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
34 #include "thr_private.h"
37 * Find a thread in the linked list of active threads and add a reference
38 * to it. Threads with positive reference counts will not be deallocated
39 * until all references are released.
42 _thr_ref_add(struct pthread *curthread, struct pthread *thread,
46 struct pthread *pthread;
53 crit = _kse_critical_enter();
54 curkse = _get_curkse();
55 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
56 pthread = _thr_hash_find(thread);
58 if ((include_dead == 0) &&
59 ((pthread->state == PS_DEAD) ||
60 ((pthread->state == PS_DEADLOCK) ||
61 ((pthread->flags & THR_FLAGS_EXITING) != 0))))
65 if (curthread != NULL)
66 curthread->critical_count++;
69 KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
70 _kse_critical_leave(crit);
72 /* Return zero if the thread exists: */
73 return ((pthread != NULL) ? 0 : ESRCH);
77 _thr_ref_delete(struct pthread *curthread, struct pthread *thread)
83 crit = _kse_critical_enter();
84 curkse = _get_curkse();
85 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
87 if (curthread != NULL)
88 curthread->critical_count--;
89 if ((thread->refcount == 0) &&
90 (thread->tlflags & TLFLAGS_GC_SAFE) != 0)
91 THR_GCLIST_ADD(thread);
92 KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
93 _kse_critical_leave(crit);