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      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 "bionic_tls.h"
     32 #include "ScopedPthreadMutexLocker.h"
     33 
     34 __LIBC_HIDDEN__ pthread_internal_t* gThreadList = NULL;
     35 __LIBC_HIDDEN__ pthread_mutex_t gThreadListLock = PTHREAD_MUTEX_INITIALIZER;
     36 
     37 void _pthread_internal_remove_locked(pthread_internal_t* thread) {
     38   if (thread->next != NULL) {
     39     thread->next->prev = thread->prev;
     40   }
     41   if (thread->prev != NULL) {
     42     thread->prev->next = thread->next;
     43   } else {
     44     gThreadList = thread->next;
     45   }
     46 
     47   // The main thread is not heap-allocated. See __libc_init_tls for the declaration,
     48   // and __libc_init_common for the point where it's added to the thread list.
     49   if (thread->allocated_on_heap) {
     50     free(thread);
     51   }
     52 }
     53 
     54 __LIBC_ABI_PRIVATE__ void _pthread_internal_add(pthread_internal_t* thread) {
     55   ScopedPthreadMutexLocker locker(&gThreadListLock);
     56 
     57   // We insert at the head.
     58   thread->next = gThreadList;
     59   thread->prev = NULL;
     60   if (thread->next != NULL) {
     61     thread->next->prev = thread;
     62   }
     63   gThreadList = thread;
     64 }
     65 
     66 __LIBC_ABI_PRIVATE__ pthread_internal_t* __get_thread(void) {
     67   void** tls = reinterpret_cast<void**>(const_cast<void*>(__get_tls()));
     68   return reinterpret_cast<pthread_internal_t*>(tls[TLS_SLOT_THREAD_ID]);
     69 }
     70