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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