33cddd74e771683f587a9398275b234e60ee0449
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 */
29 #include "pthread_internal.h"
31 #include <errno.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <sys/mman.h>
36 #include "private/bionic_futex.h"
37 #include "private/bionic_tls.h"
38 #include "private/libc_logging.h"
39 #include "private/ScopedPthreadMutexLocker.h"
41 pthread_internal_t* g_thread_list = NULL;
42 pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER;
44 pthread_internal_t* __create_thread_struct() {
45 void* result = mmap(NULL, sizeof(pthread_internal_t), PROT_READ | PROT_WRITE,
46 MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0);
47 if (result == MAP_FAILED) {
48 __libc_format_log(ANDROID_LOG_WARN, "libc",
49 "__create_thread_struct() failed: %s", strerror(errno));
50 return NULL;
51 }
52 return reinterpret_cast<pthread_internal_t*>(result);
53 }
55 void __free_thread_struct(pthread_internal_t* thread) {
56 int result = munmap(thread, sizeof(pthread_internal_t));
57 if (result != 0) {
58 __libc_format_log(ANDROID_LOG_WARN, "libc",
59 "__free_thread_struct() failed: %s", strerror(errno));
60 }
61 }
63 void _pthread_internal_remove_locked(pthread_internal_t* thread) {
64 if (thread->next != NULL) {
65 thread->next->prev = thread->prev;
66 }
67 if (thread->prev != NULL) {
68 thread->prev->next = thread->next;
69 } else {
70 g_thread_list = thread->next;
71 }
73 // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
74 // and __libc_init_common for the point where it's added to the thread list.
75 if ((thread->attr.flags & PTHREAD_ATTR_FLAG_MAIN_THREAD) == 0) {
76 __free_thread_struct(thread);
77 }
78 }
80 void _pthread_internal_add(pthread_internal_t* thread) {
81 ScopedPthreadMutexLocker locker(&g_thread_list_lock);
83 // We insert at the head.
84 thread->next = g_thread_list;
85 thread->prev = NULL;
86 if (thread->next != NULL) {
87 thread->next->prev = thread;
88 }
89 g_thread_list = thread;
90 }
92 pthread_internal_t* __get_thread(void) {
93 return reinterpret_cast<pthread_internal_t*>(__get_tls()[TLS_SLOT_THREAD_ID]);
94 }