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 <errno.h> 32 #include <stdlib.h> 33 #include <string.h> 34 #include <sys/mman.h> 35 36 #include "private/bionic_futex.h" 37 #include "private/bionic_tls.h" 38 #include "private/libc_logging.h" 39 #include "private/ScopedPthreadMutexLocker.h" 40 41 static pthread_internal_t* g_thread_list = NULL; 42 static pthread_mutex_t g_thread_list_lock = PTHREAD_MUTEX_INITIALIZER; 43 44 pthread_t __pthread_internal_add(pthread_internal_t* thread) { 45 ScopedPthreadMutexLocker locker(&g_thread_list_lock); 46 47 // We insert at the head. 48 thread->next = g_thread_list; 49 thread->prev = NULL; 50 if (thread->next != NULL) { 51 thread->next->prev = thread; 52 } 53 g_thread_list = thread; 54 return reinterpret_cast<pthread_t>(thread); 55 } 56 57 void __pthread_internal_remove(pthread_internal_t* thread) { 58 ScopedPthreadMutexLocker locker(&g_thread_list_lock); 59 60 if (thread->next != NULL) { 61 thread->next->prev = thread->prev; 62 } 63 if (thread->prev != NULL) { 64 thread->prev->next = thread->next; 65 } else { 66 g_thread_list = thread->next; 67 } 68 } 69 70 static void __pthread_internal_free(pthread_internal_t* thread) { 71 if (thread->mmap_size != 0) { 72 // Free mapped space, including thread stack and pthread_internal_t. 73 munmap(thread->attr.stack_base, thread->mmap_size); 74 } 75 } 76 77 void __pthread_internal_remove_and_free(pthread_internal_t* thread) { 78 __pthread_internal_remove(thread); 79 __pthread_internal_free(thread); 80 } 81 82 pthread_internal_t* __pthread_internal_find(pthread_t thread_id) { 83 pthread_internal_t* thread = reinterpret_cast<pthread_internal_t*>(thread_id); 84 85 // check if thread is pthread_self() before acquiring the lock 86 if (thread == __get_thread()) { 87 return thread; 88 } 89 90 ScopedPthreadMutexLocker locker(&g_thread_list_lock); 91 92 for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) { 93 if (t == thread) { 94 return thread; 95 } 96 } 97 return NULL; 98 } 99