pthread_internal.h revision 2a1bb4e64677b9abbc17173c79768ed494565047 
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#include <stdbool.h>
33
34__BEGIN_DECLS
35
36typedef struct pthread_internal_t
37{
38    struct pthread_internal_t*  next;
39    struct pthread_internal_t*  prev;
40    pthread_attr_t              attr;
41    pid_t                       kernel_id;
42    bool                        allocated_on_heap;
43    pthread_cond_t              join_cond;
44    int                         join_count;
45    void*                       return_value;
46    int                         internal_flags;
47    __pthread_cleanup_t*        cleanup_stack;
48    void**                      tls;         /* thread-local storage area */
49
50    /*
51     * The dynamic linker implements dlerror(3), which makes it hard for us to implement this
52     * per-thread buffer by simply using malloc(3) and free(3).
53     */
54#define __BIONIC_DLERROR_BUFFER_SIZE 512
55    char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
56} pthread_internal_t;
57
58int _init_thread(pthread_internal_t* thread, pid_t kernel_id, const pthread_attr_t* attr,
59                 void* stack_base, bool add_to_thread_list);
60void _pthread_internal_add( pthread_internal_t*  thread );
61pthread_internal_t* __get_thread(void);
62
63__LIBC_HIDDEN__ void pthread_key_clean_all(void);
64
65#define PTHREAD_ATTR_FLAG_DETACHED      0x00000001
66#define PTHREAD_ATTR_FLAG_USER_STACK    0x00000002
67
68extern __LIBC_HIDDEN__ const pthread_attr_t gDefaultPthreadAttr;
69extern pthread_internal_t* gThreadList;
70extern pthread_mutex_t gThreadListLock;
71
72/* needed by posix-timers.c */
73
74static __inline__ void timespec_add( struct timespec*  a, const struct timespec*  b )
75{
76    a->tv_sec  += b->tv_sec;
77    a->tv_nsec += b->tv_nsec;
78    if (a->tv_nsec >= 1000000000) {
79        a->tv_nsec -= 1000000000;
80        a->tv_sec  += 1;
81    }
82}
83
84static  __inline__ void timespec_sub( struct timespec*  a, const struct timespec*  b )
85{
86    a->tv_sec  -= b->tv_sec;
87    a->tv_nsec -= b->tv_nsec;
88    if (a->tv_nsec < 0) {
89        a->tv_nsec += 1000000000;
90        a->tv_sec  -= 1;
91    }
92}
93
94static  __inline__ void timespec_zero( struct timespec*  a )
95{
96    a->tv_sec = a->tv_nsec = 0;
97}
98
99static  __inline__ int timespec_is_zero( const struct timespec*  a )
100{
101    return (a->tv_sec == 0 && a->tv_nsec == 0);
102}
103
104static  __inline__ int timespec_cmp( const struct timespec*  a, const struct timespec*  b )
105{
106    if (a->tv_sec  < b->tv_sec)  return -1;
107    if (a->tv_sec  > b->tv_sec)  return +1;
108    if (a->tv_nsec < b->tv_nsec) return -1;
109    if (a->tv_nsec > b->tv_nsec) return +1;
110    return 0;
111}
112
113static  __inline__ int timespec_cmp0( const struct timespec*  a )
114{
115    if (a->tv_sec < 0) return -1;
116    if (a->tv_sec > 0) return +1;
117    if (a->tv_nsec < 0) return -1;
118    if (a->tv_nsec > 0) return +1;
119    return 0;
120}
121
122extern int  __pthread_cond_timedwait(pthread_cond_t*,
123                                     pthread_mutex_t*,
124                                     const struct timespec*,
125                                     clockid_t);
126
127extern int  __pthread_cond_timedwait_relative(pthread_cond_t*,
128                                              pthread_mutex_t*,
129                                              const struct timespec*);
130
131/* needed by fork.c */
132extern void __timer_table_start_stop(int  stop);
133extern void __bionic_atfork_run_prepare();
134extern void __bionic_atfork_run_child();
135extern void __bionic_atfork_run_parent();
136
137__END_DECLS
138
139#endif /* _PTHREAD_INTERNAL_H_ */
140