1 /*
2 * Copyright (C) 2008 The Android Open Source Project
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 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
13 * distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include "pthread_internal.h"
30
31 #include "bionic_tls.h"
32 #include "ScopedPthreadMutexLocker.h"
33
34 __LIBC_HIDDEN__ pthread_internal_t* gThreadList = NULL;
35 __LIBC_HIDDEN__ pthread_mutex_t gThreadListLock = PTHREAD_MUTEX_INITIALIZER;
36
_pthread_internal_remove_locked(pthread_internal_t * thread)37 void _pthread_internal_remove_locked(pthread_internal_t* thread) {
38 if (thread->next != NULL) {
39 thread->next->prev = thread->prev;
40 }
41 if (thread->prev != NULL) {
42 thread->prev->next = thread->next;
43 } else {
44 gThreadList = thread->next;
45 }
46
47 // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
48 // and __libc_init_common for the point where it's added to the thread list.
49 if (thread->allocated_on_heap) {
50 free(thread);
51 }
52 }
53
_pthread_internal_add(pthread_internal_t * thread)54 __LIBC_ABI_PRIVATE__ void _pthread_internal_add(pthread_internal_t* thread) {
55 ScopedPthreadMutexLocker locker(&gThreadListLock);
56
57 // We insert at the head.
58 thread->next = gThreadList;
59 thread->prev = NULL;
60 if (thread->next != NULL) {
61 thread->next->prev = thread;
62 }
63 gThreadList = thread;
64 }
65
__get_thread(void)66 __LIBC_ABI_PRIVATE__ pthread_internal_t* __get_thread(void) {
67 void** tls = reinterpret_cast<void**>(const_cast<void*>(__get_tls()));
68 return reinterpret_cast<pthread_internal_t*>(tls[TLS_SLOT_THREAD_ID]);
69 }
70