xref: /aosp_15_r20/external/llvm-libc/src/stdlib/atexit.cpp (revision 71db0c75aadcf003ffe3238005f61d7618a3fead)
1*71db0c75SAndroid Build Coastguard Worker //===-- Implementation of atexit ------------------------------------------===//
2*71db0c75SAndroid Build Coastguard Worker //
3*71db0c75SAndroid Build Coastguard Worker // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*71db0c75SAndroid Build Coastguard Worker // See https://llvm.org/LICENSE.txt for license information.
5*71db0c75SAndroid Build Coastguard Worker // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*71db0c75SAndroid Build Coastguard Worker //
7*71db0c75SAndroid Build Coastguard Worker //===----------------------------------------------------------------------===//
8*71db0c75SAndroid Build Coastguard Worker 
9*71db0c75SAndroid Build Coastguard Worker #include "src/stdlib/atexit.h"
10*71db0c75SAndroid Build Coastguard Worker #include "hdr/types/atexithandler_t.h"
11*71db0c75SAndroid Build Coastguard Worker #include "src/__support/common.h"
12*71db0c75SAndroid Build Coastguard Worker #include "src/__support/macros/config.h"
13*71db0c75SAndroid Build Coastguard Worker #include "src/stdlib/exit_handler.h"
14*71db0c75SAndroid Build Coastguard Worker 
15*71db0c75SAndroid Build Coastguard Worker namespace LIBC_NAMESPACE_DECL {
16*71db0c75SAndroid Build Coastguard Worker 
17*71db0c75SAndroid Build Coastguard Worker constinit ExitCallbackList atexit_callbacks;
18*71db0c75SAndroid Build Coastguard Worker Mutex handler_list_mtx(false, false, false, false);
19*71db0c75SAndroid Build Coastguard Worker [[gnu::weak]] extern void teardown_main_tls();
20*71db0c75SAndroid Build Coastguard Worker 
21*71db0c75SAndroid Build Coastguard Worker extern "C" {
22*71db0c75SAndroid Build Coastguard Worker 
__cxa_atexit(AtExitCallback * callback,void * payload,void *)23*71db0c75SAndroid Build Coastguard Worker int __cxa_atexit(AtExitCallback *callback, void *payload, void *) {
24*71db0c75SAndroid Build Coastguard Worker   return add_atexit_unit(atexit_callbacks, {callback, payload});
25*71db0c75SAndroid Build Coastguard Worker }
26*71db0c75SAndroid Build Coastguard Worker 
__cxa_finalize(void * dso)27*71db0c75SAndroid Build Coastguard Worker void __cxa_finalize(void *dso) {
28*71db0c75SAndroid Build Coastguard Worker   if (!dso) {
29*71db0c75SAndroid Build Coastguard Worker     call_exit_callbacks(atexit_callbacks);
30*71db0c75SAndroid Build Coastguard Worker     if (teardown_main_tls)
31*71db0c75SAndroid Build Coastguard Worker       teardown_main_tls();
32*71db0c75SAndroid Build Coastguard Worker   }
33*71db0c75SAndroid Build Coastguard Worker }
34*71db0c75SAndroid Build Coastguard Worker 
35*71db0c75SAndroid Build Coastguard Worker } // extern "C"
36*71db0c75SAndroid Build Coastguard Worker 
37*71db0c75SAndroid Build Coastguard Worker LLVM_LIBC_FUNCTION(int, atexit, (__atexithandler_t callback)) {
38*71db0c75SAndroid Build Coastguard Worker   return add_atexit_unit(
39*71db0c75SAndroid Build Coastguard Worker       atexit_callbacks,
40*71db0c75SAndroid Build Coastguard Worker       {&stdc_at_exit_func, reinterpret_cast<void *>(callback)});
41*71db0c75SAndroid Build Coastguard Worker }
42*71db0c75SAndroid Build Coastguard Worker 
43*71db0c75SAndroid Build Coastguard Worker } // namespace LIBC_NAMESPACE_DECL
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