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 */
29 #include "pthread_internal.h"
31 #include "private/bionic_futex.h"
32 #include "private/bionic_pthread.h"
33 #include "private/bionic_tls.h"
34 #include "private/ScopedPthreadMutexLocker.h"
36 pthread_internal_t* g_thread_list = NULL;
37 pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER;
39 void _pthread_internal_remove_locked(pthread_internal_t* thread) {
40 if (thread->next != NULL) {
41 thread->next->prev = thread->prev;
42 }
43 if (thread->prev != NULL) {
44 thread->prev->next = thread->next;
45 } else {
46 g_thread_list = thread->next;
47 }
49 // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
50 // and __libc_init_common for the point where it's added to the thread list.
51 if ((thread->attr.flags & PTHREAD_ATTR_FLAG_MAIN_THREAD) == 0) {
52 free(thread);
53 }
54 }
56 void _pthread_internal_add(pthread_internal_t* thread) {
57 ScopedPthreadMutexLocker locker(&g_thread_list_lock);
59 // We insert at the head.
60 thread->next = g_thread_list;
61 thread->prev = NULL;
62 if (thread->next != NULL) {
63 thread->next->prev = thread;
64 }
65 g_thread_list = thread;
66 }
68 pthread_internal_t* __get_thread(void) {
69 return reinterpret_cast<pthread_internal_t*>(__get_tls()[TLS_SLOT_THREAD_ID]);
70 }
72 pid_t __pthread_gettid(pthread_t t) {
73 return reinterpret_cast<pthread_internal_t*>(t)->tid;
74 }
76 // Initialize 'ts' with the difference between 'abstime' and the current time
77 // according to 'clock'. Returns -1 if abstime already expired, or 0 otherwise.
78 int __timespec_from_absolute(timespec* ts, const timespec* abstime, clockid_t clock) {
79 clock_gettime(clock, ts);
80 ts->tv_sec = abstime->tv_sec - ts->tv_sec;
81 ts->tv_nsec = abstime->tv_nsec - ts->tv_nsec;
82 if (ts->tv_nsec < 0) {
83 ts->tv_sec--;
84 ts->tv_nsec += 1000000000;
85 }
86 if ((ts->tv_nsec < 0) || (ts->tv_sec < 0)) {
87 return -1;
88 }
89 return 0;
90 }