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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 <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   ScopedPthreadMutexLocker locker(&g_thread_list_lock);
     85 
     86   for (pthread_internal_t* t = g_thread_list; t != NULL; t = t->next) {
     87     if (t == thread) {
     88       return thread;
     89     }
     90   }
     91   return NULL;
     92 }
     93