pthread_internal.h revision b30aff405a220495941f1673b0a5e66c4fa8b84c 
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#ifndef _PTHREAD_INTERNAL_H_
29#define _PTHREAD_INTERNAL_H_
30
31#include <pthread.h>
32
33struct pthread_internal_t {
34  struct pthread_internal_t* next;
35  struct pthread_internal_t* prev;
36
37  pid_t tid;
38
39  void** tls;
40
41  pthread_attr_t attr;
42
43  __pthread_cleanup_t* cleanup_stack;
44
45  void* (*start_routine)(void*);
46  void* start_routine_arg;
47  void* return_value;
48
49  void* alternate_signal_stack;
50
51  pthread_mutex_t startup_handshake_mutex;
52
53  /*
54   * The dynamic linker implements dlerror(3), which makes it hard for us to implement this
55   * per-thread buffer by simply using malloc(3) and free(3).
56   */
57#define __BIONIC_DLERROR_BUFFER_SIZE 512
58  char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
59};
60
61__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list);
62__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
63__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
64__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
65__LIBC_HIDDEN__ pthread_internal_t* __get_thread(void);
66
67__LIBC_HIDDEN__ void pthread_key_clean_all(void);
68__LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
69
70/* Has the thread been detached by a pthread_join or pthread_detach call? */
71#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
72
73/* Was the thread's stack allocated by the user rather than by us? */
74#define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002
75
76/* Has the thread been joined by another thread? */
77#define PTHREAD_ATTR_FLAG_JOINED 0x00000004
78
79/* Is this the main thread? */
80#define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000
81
82/*
83 * Traditionally we give threads a 1MiB stack. When we started
84 * allocating per-thread alternate signal stacks to ease debugging of
85 * stack overflows, we subtracted the same amount we were using there
86 * from the default thread stack size. This should keep memory usage
87 * roughly constant.
88 */
89#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ)
90
91__LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list;
92__LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock;
93
94__LIBC_HIDDEN__ int __timespec_from_absolute(timespec*, const timespec*, clockid_t);
95
96/* Needed by fork. */
97__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
98__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
99__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
100
101#endif /* _PTHREAD_INTERNAL_H_ */
102