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
29#include "pthread_internal.h"
30
31#include "private/bionic_futex.h"
32#include "private/bionic_tls.h"
33#include "private/ScopedPthreadMutexLocker.h"
34
35pthread_internal_t* g_thread_list = NULL;
36pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER;
37
38void _pthread_internal_remove_locked(pthread_internal_t* thread) {
39  if (thread->next != NULL) {
40    thread->next->prev = thread->prev;
41  }
42  if (thread->prev != NULL) {
43    thread->prev->next = thread->next;
44  } else {
45    g_thread_list = thread->next;
46  }
47
48  // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
49  // and __libc_init_common for the point where it's added to the thread list.
50  if ((thread->attr.flags & PTHREAD_ATTR_FLAG_MAIN_THREAD) == 0) {
51    free(thread);
52  }
53}
54
55void _pthread_internal_add(pthread_internal_t* thread) {
56  ScopedPthreadMutexLocker locker(&g_thread_list_lock);
57
58  // We insert at the head.
59  thread->next = g_thread_list;
60  thread->prev = NULL;
61  if (thread->next != NULL) {
62    thread->next->prev = thread;
63  }
64  g_thread_list = thread;
65}
66
67pthread_internal_t* __get_thread(void) {
68  return reinterpret_cast<pthread_internal_t*>(__get_tls()[TLS_SLOT_THREAD_ID]);
69}
70
71// Initialize 'ts' with the difference between 'abstime' and the current time
72// according to 'clock'. Returns -1 if abstime already expired, or 0 otherwise.
73int __timespec_from_absolute(timespec* ts, const timespec* abstime, clockid_t clock) {
74  clock_gettime(clock, ts);
75  ts->tv_sec  = abstime->tv_sec - ts->tv_sec;
76  ts->tv_nsec = abstime->tv_nsec - ts->tv_nsec;
77  if (ts->tv_nsec < 0) {
78    ts->tv_sec--;
79    ts->tv_nsec += 1000000000;
80  }
81  if ((ts->tv_nsec < 0) || (ts->tv_sec < 0)) {
82    return -1;
83  }
84  return 0;
85}
86