pthread_internal.h revision 7086ad6919feb2415c6027163f5c63323bcca27c 
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 private:
40  pid_t cached_pid_;
41
42 public:
43  pid_t invalidate_cached_pid() {
44    pid_t old_value;
45    get_cached_pid(&old_value);
46    set_cached_pid(0);
47    return old_value;
48  }
49
50  void set_cached_pid(pid_t value) {
51    cached_pid_ = value;
52  }
53
54  bool get_cached_pid(pid_t* cached_pid) {
55    *cached_pid = cached_pid_;
56    return (*cached_pid != 0);
57  }
58
59  void** tls;
60
61  pthread_attr_t attr;
62
63  __pthread_cleanup_t* cleanup_stack;
64
65  void* (*start_routine)(void*);
66  void* start_routine_arg;
67  void* return_value;
68
69  void* alternate_signal_stack;
70
71  pthread_mutex_t startup_handshake_mutex;
72
73  /*
74   * The dynamic linker implements dlerror(3), which makes it hard for us to implement this
75   * per-thread buffer by simply using malloc(3) and free(3).
76   */
77#define __BIONIC_DLERROR_BUFFER_SIZE 512
78  char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
79};
80
81__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list);
82__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
83__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
84__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
85__LIBC_HIDDEN__ pthread_internal_t* __get_thread(void);
86
87__LIBC_HIDDEN__ void pthread_key_clean_all(void);
88__LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
89
90/* Has the thread been detached by a pthread_join or pthread_detach call? */
91#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
92
93/* Was the thread's stack allocated by the user rather than by us? */
94#define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002
95
96/* Has the thread been joined by another thread? */
97#define PTHREAD_ATTR_FLAG_JOINED 0x00000004
98
99/* Is this the main thread? */
100#define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000
101
102/*
103 * Traditionally we give threads a 1MiB stack. When we started
104 * allocating per-thread alternate signal stacks to ease debugging of
105 * stack overflows, we subtracted the same amount we were using there
106 * from the default thread stack size. This should keep memory usage
107 * roughly constant.
108 */
109#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ)
110
111__LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list;
112__LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock;
113
114__LIBC_HIDDEN__ int __timespec_from_absolute(timespec*, const timespec*, clockid_t);
115
116/* Needed by fork. */
117__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
118__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
119__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
120
121#endif /* _PTHREAD_INTERNAL_H_ */
122