pthread_internal.cpp revision 220b99bdc1c5f51825ac2a87062bc05fe3e0d722 
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
41static pthread_internal_t* g_thread_list = NULL;
42static pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER;
43
44pthread_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
57void __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
70static 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
77void __pthread_internal_remove_and_free(pthread_internal_t* thread) {
78  __pthread_internal_remove(thread);
79  __pthread_internal_free(thread);
80}
81
82pthread_internal_t* __pthread_internal_find(pthread_t thread_id) {
83  pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(thread_id);
84  ScopedPthreadMutexLocker locker(&g_thread_list_lock);
85
86  for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) {
87    if (t == thread) {
88      return thread;
89    }
90  }
91  return NULL;
92}
93