pthread_internal.h revision ae8eb74675722b57ab66a51f1d6f4f250137bb23 
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    pthread_cond_t              join_cond;
43    int                         join_count;
44    void*                       return_value;
45    int                         internal_flags;
46    __pthread_cleanup_t*        cleanup_stack;
47    void**                      tls;         /* thread-local storage area */
48
49    /*
50     * The dynamic linker implements dlerror(3), which makes it hard for us to implement this
51     * per-thread buffer by simply using malloc(3) and free(3).
52     */
53#define __BIONIC_DLERROR_BUFFER_SIZE 512
54    char dlerror_buffer[__BIONIC_DLERROR_BUFFER_SIZE];
55} pthread_internal_t;
56
57int _init_thread(pthread_internal_t* thread, pid_t kernel_id, const pthread_attr_t* attr,
58                 void* stack_base, bool add_to_thread_list);
59void _pthread_internal_add( pthread_internal_t*  thread );
60pthread_internal_t* __get_thread(void);
61
62/* needed by posix-timers.c */
63
64static __inline__ void timespec_add( struct timespec*  a, const struct timespec*  b )
65{
66    a->tv_sec  += b->tv_sec;
67    a->tv_nsec += b->tv_nsec;
68    if (a->tv_nsec >= 1000000000) {
69        a->tv_nsec -= 1000000000;
70        a->tv_sec  += 1;
71    }
72}
73
74static  __inline__ void timespec_sub( 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 < 0) {
79        a->tv_nsec += 1000000000;
80        a->tv_sec  -= 1;
81    }
82}
83
84static  __inline__ void timespec_zero( struct timespec*  a )
85{
86    a->tv_sec = a->tv_nsec = 0;
87}
88
89static  __inline__ int timespec_is_zero( const struct timespec*  a )
90{
91    return (a->tv_sec == 0 && a->tv_nsec == 0);
92}
93
94static  __inline__ int timespec_cmp( const struct timespec*  a, const struct timespec*  b )
95{
96    if (a->tv_sec  < b->tv_sec)  return -1;
97    if (a->tv_sec  > b->tv_sec)  return +1;
98    if (a->tv_nsec < b->tv_nsec) return -1;
99    if (a->tv_nsec > b->tv_nsec) return +1;
100    return 0;
101}
102
103static  __inline__ int timespec_cmp0( const struct timespec*  a )
104{
105    if (a->tv_sec < 0) return -1;
106    if (a->tv_sec > 0) return +1;
107    if (a->tv_nsec < 0) return -1;
108    if (a->tv_nsec > 0) return +1;
109    return 0;
110}
111
112extern int  __pthread_cond_timedwait(pthread_cond_t*,
113                                     pthread_mutex_t*,
114                                     const struct timespec*,
115                                     clockid_t);
116
117extern int  __pthread_cond_timedwait_relative(pthread_cond_t*,
118                                              pthread_mutex_t*,
119                                              const struct timespec*);
120
121/* needed by fork.c */
122extern void __timer_table_start_stop(int  stop);
123extern void __bionic_atfork_run_prepare();
124extern void __bionic_atfork_run_child();
125extern void __bionic_atfork_run_parent();
126
127__END_DECLS
128
129#endif /* _PTHREAD_INTERNAL_H_ */
130