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
22 class thread_local_dtor {
23 public:
24 void (*func) (void *);
25 void *arg;
26 void *dso_handle; // unused...
27 thread_local_dtor* next;
28 };
29
30 extern "C" int __cxa_thread_atexit_impl(void (*func) (void *), void *arg, void *dso_handle);
31 extern "C" void __loader_add_thread_local_dtor(void* dso_handle) __attribute__((weak));
32 extern "C" void __loader_remove_thread_local_dtor(void* dso_handle) __attribute__((weak));
33
34 __BIONIC_WEAK_FOR_NATIVE_BRIDGE
__cxa_thread_atexit_impl(void (* func)(void *),void * arg,void * dso_handle)35 int __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
__cxa_thread_finalize()51 extern "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