pthread_internal.h revision 27efc48814b8153c55cbcd0af5d9add824816e69 
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
33/* Has the thread been detached by a pthread_join or pthread_detach call? */
34#define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
35
36/* Was the thread's stack allocated by the user rather than by us? */
37#define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002
38
39/* Has the thread been joined by another thread? */
40#define PTHREAD_ATTR_FLAG_JOINED 0x00000004
41
42/* Is this the main thread? */
43#define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000
44
45struct pthread_internal_t {
46  struct pthread_internal_t* next;
47  struct pthread_internal_t* prev;
48
49  pid_t tid;
50
51 private:
52  pid_t cached_pid_;
53
54 public:
55  pid_t invalidate_cached_pid() {
56    pid_t old_value;
57    get_cached_pid(&old_value);
58    set_cached_pid(0);
59    return old_value;
60  }
61
62  void set_cached_pid(pid_t value) {
63    cached_pid_ = value;
64  }
65
66  bool get_cached_pid(pid_t* cached_pid) {
67    *cached_pid = cached_pid_;
68    return (*cached_pid != 0);
69  }
70
71  bool user_allocated_stack() {
72    return (attr.flags & PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK) != 0;
73  }
74
75  void** tls;
76
77  pthread_attr_t attr;
78
79  __pthread_cleanup_t* cleanup_stack;
80
81  void* (*start_routine)(void*);
82  void* start_routine_arg;
83  void* return_value;
84
85  void* alternate_signal_stack;
86
87  pthread_mutex_t startup_handshake_mutex;
88
89  /*
90   * The dynamic linker implements dlerror(3), which makes it hard for us to implement this
91   * per-thread buffer by simply using malloc(3) and free(3).
92   */
93#define __BIONIC_DLERROR_BUFFER_SIZE 512
94  char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
95};
96
97__LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list);
98__LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
99__LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
100__LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
101
102/* Various third-party apps contain a backport of our pthread_rwlock implementation that uses this. */
103extern "C" __LIBC64_HIDDEN__ pthread_internal_t* __get_thread(void);
104
105__LIBC_HIDDEN__ void pthread_key_clean_all(void);
106__LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
107
108/*
109 * Traditionally we gave threads a 1MiB stack. When we started
110 * allocating per-thread alternate signal stacks to ease debugging of
111 * stack overflows, we subtracted the same amount we were using there
112 * from the default thread stack size. This should keep memory usage
113 * roughly constant.
114 */
115#define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ)
116
117__LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list;
118__LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock;
119
120__LIBC_HIDDEN__ int __timespec_from_absolute(timespec*, const timespec*, clockid_t);
121
122/* Needed by fork. */
123__LIBC_HIDDEN__ extern void __bionic_atfork_run_prepare();
124__LIBC_HIDDEN__ extern void __bionic_atfork_run_child();
125__LIBC_HIDDEN__ extern void __bionic_atfork_run_parent();
126
127#endif /* _PTHREAD_INTERNAL_H_ */
128