1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16#include <sys/cdefs.h>
17
18#include <private/bionic_defs.h>
19
20#include "pthread_internal.h"
21
22class thread_local_dtor {
23 public:
24  void (*func) (void *);
25  void *arg;
26  void *dso_handle; // unused...
27  thread_local_dtor* next;
28};
29
30extern "C" int __cxa_thread_atexit_impl(void (*func) (void *), void *arg, void *dso_handle);
31extern "C" void __loader_add_thread_local_dtor(void* dso_handle) __attribute__((weak));
32extern "C" void __loader_remove_thread_local_dtor(void* dso_handle) __attribute__((weak));
33
34__BIONIC_WEAK_FOR_NATIVE_BRIDGE
35int __cxa_thread_atexit_impl(void (*func) (void *), void *arg, void *dso_handle) {
36  thread_local_dtor* dtor = new thread_local_dtor();
37
38  dtor->func = func;
39  dtor->arg = arg;
40  dtor->dso_handle = dso_handle;
41
42  pthread_internal_t* thread = __get_thread();
43  dtor->next = thread->thread_local_dtors;
44  thread->thread_local_dtors = dtor;
45  if (__loader_add_thread_local_dtor != nullptr) {
46    __loader_add_thread_local_dtor(dso_handle);
47  }
48  return 0;
49}
50
51extern "C" __LIBC_HIDDEN__ void __cxa_thread_finalize() {
52  pthread_internal_t* thread = __get_thread();
53  while (thread->thread_local_dtors != nullptr) {
54    thread_local_dtor* current = thread->thread_local_dtors;
55    thread->thread_local_dtors = current->next;
56
57    current->func(current->arg);
58    if (__loader_remove_thread_local_dtor != nullptr) {
59      __loader_remove_thread_local_dtor(current->dso_handle);
60    }
61    delete current;
62  }
63}
64