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. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by John Birrell.
17 * 4. Neither the name of the author nor the names of any co-contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include "thr_private.h"
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.
45 _thr_ref_add(struct pthread *curthread, struct pthread *thread,
49 struct pthread *pthread;
56 crit = _kse_critical_enter();
57 curkse = _get_curkse();
58 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
59 pthread = _thr_hash_find(thread);
61 if ((include_dead == 0) &&
62 ((pthread->state == PS_DEAD) ||
63 ((pthread->state == PS_DEADLOCK) ||
64 ((pthread->flags & THR_FLAGS_EXITING) != 0))))
68 if (curthread != NULL)
69 curthread->critical_count++;
72 KSE_LOCK_RELEASE(curkse, &_thread_list_lock);
73 _kse_critical_leave(crit);
75 /* Return zero if the thread exists: */
76 return ((pthread != NULL) ? 0 : ESRCH);
80 _thr_ref_delete(struct pthread *curthread, struct pthread *thread)
86 crit = _kse_critical_enter();
87 curkse = _get_curkse();
88 KSE_LOCK_ACQUIRE(curkse, &_thread_list_lock);
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);