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 <errno.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <sys/mman.h>
35
36 #include "private/bionic_futex.h"
37 #include "private/bionic_tls.h"
38 #include "private/libc_logging.h"
39 #include "private/ScopedPthreadMutexLocker.h"
40
41 static pthread_internal_t* g_thread_list = NULL;
42 static pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER;
43
__pthread_internal_add(pthread_internal_t * thread)44 pthread_t __pthread_internal_add(pthread_internal_t* thread) {
45 ScopedPthreadMutexLocker locker(&g_thread_list_lock);
46
47 // We insert at the head.
48 thread->next = g_thread_list;
49 thread->prev = NULL;
50 if (thread->next != NULL) {
51 thread->next->prev = thread;
52 }
53 g_thread_list = thread;
54 return reinterpret_cast<pthread_t>(thread);
55 }
56
__pthread_internal_remove(pthread_internal_t * thread)57 void __pthread_internal_remove(pthread_internal_t* thread) {
58 ScopedPthreadMutexLocker locker(&g_thread_list_lock);
59
60 if (thread->next != NULL) {
61 thread->next->prev = thread->prev;
62 }
63 if (thread->prev != NULL) {
64 thread->prev->next = thread->next;
65 } else {
66 g_thread_list = thread->next;
67 }
68 }
69
__pthread_internal_free(pthread_internal_t * thread)70 static void __pthread_internal_free(pthread_internal_t* thread) {
71 if (thread->mmap_size != 0) {
72 // Free mapped space, including thread stack and pthread_internal_t.
73 munmap(thread->attr.stack_base, thread->mmap_size);
74 }
75 }
76
__pthread_internal_remove_and_free(pthread_internal_t * thread)77 void __pthread_internal_remove_and_free(pthread_internal_t* thread) {
78 __pthread_internal_remove(thread);
79 __pthread_internal_free(thread);
80 }
81
__pthread_internal_find(pthread_t thread_id)82 pthread_internal_t* __pthread_internal_find(pthread_t thread_id) {
83 pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(thread_id);
84
85 // check if thread is pthread_self() before acquiring the lock
86 if (thread == __get_thread()) {
87 return thread;
88 }
89
90 ScopedPthreadMutexLocker locker(&g_thread_list_lock);
91
92 for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) {
93 if (t == thread) {
94 return thread;
95 }
96 }
97 return NULL;
98 }
99