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_
31 #include <pthread.h>
33 /* Has the thread been detached by a pthread_join or pthread_detach call? */
34 #define PTHREAD_ATTR_FLAG_DETACHED 0x00000001
36 /* Was the thread's stack allocated by the user rather than by us? */
37 #define PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK 0x00000002
39 /* Has the thread been joined by another thread? */
40 #define PTHREAD_ATTR_FLAG_JOINED 0x00000004
42 /* Is this the main thread? */
43 #define PTHREAD_ATTR_FLAG_MAIN_THREAD 0x80000000
45 struct pthread_internal_t {
46 struct pthread_internal_t* next;
47 struct pthread_internal_t* prev;
49 pid_t tid;
51 private:
52 pid_t cached_pid_;
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 }
62 void set_cached_pid(pid_t value) {
63 cached_pid_ = value;
64 }
66 bool get_cached_pid(pid_t* cached_pid) {
67 *cached_pid = cached_pid_;
68 return (*cached_pid != 0);
69 }
71 bool user_allocated_stack() {
72 return (attr.flags & PTHREAD_ATTR_FLAG_USER_ALLOCATED_STACK) != 0;
73 }
75 void** tls;
77 pthread_attr_t attr;
79 __pthread_cleanup_t* cleanup_stack;
81 void* (*start_routine)(void*);
82 void* start_routine_arg;
83 void* return_value;
85 void* alternate_signal_stack;
87 pthread_mutex_t startup_handshake_mutex;
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 };
97 __LIBC_HIDDEN__ pthread_internal_t* __create_thread_struct();
98 __LIBC_HIDDEN__ void __free_thread_struct(pthread_internal_t*);
99 __LIBC_HIDDEN__ int __init_thread(pthread_internal_t* thread, bool add_to_thread_list);
100 __LIBC_HIDDEN__ void __init_tls(pthread_internal_t* thread);
101 __LIBC_HIDDEN__ void __init_alternate_signal_stack(pthread_internal_t*);
102 __LIBC_HIDDEN__ void _pthread_internal_add(pthread_internal_t* thread);
104 /* Various third-party apps contain a backport of our pthread_rwlock implementation that uses this. */
105 extern "C" __LIBC64_HIDDEN__ pthread_internal_t* __get_thread(void);
107 __LIBC_HIDDEN__ void pthread_key_clean_all(void);
108 __LIBC_HIDDEN__ void _pthread_internal_remove_locked(pthread_internal_t* thread);
110 /*
111 * Traditionally we gave threads a 1MiB stack. When we started
112 * allocating per-thread alternate signal stacks to ease debugging of
113 * stack overflows, we subtracted the same amount we were using there
114 * from the default thread stack size. This should keep memory usage
115 * roughly constant.
116 */
117 #define PTHREAD_STACK_SIZE_DEFAULT ((1 * 1024 * 1024) - SIGSTKSZ)
119 __LIBC_HIDDEN__ extern pthread_internal_t* g_thread_list;
120 __LIBC_HIDDEN__ extern pthread_mutex_t g_thread_list_lock;
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();
127 #endif /* _PTHREAD_INTERNAL_H_ */