| 1 | //===-- Implementation of atexit ------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/stdlib/atexit.h" |
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| 10 | #include "hdr/types/atexithandler_t.h" |
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| 11 | #include "src/__support/common.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | #include "src/stdlib/exit_handler.h" |
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| 14 | |
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| 15 | namespace LIBC_NAMESPACE_DECL { |
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| 16 | |
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| 17 | constinit ExitCallbackList atexit_callbacks; |
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| 18 | Mutex handler_list_mtx(false, false, false, false); |
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| 19 | [[gnu::weak]] extern void teardown_main_tls(); |
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| 20 | |
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| 21 | extern "C" { |
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| 22 | |
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| 23 | int __cxa_atexit(AtExitCallback *callback, void *payload, void *) { |
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| 24 | return add_atexit_unit(atexit_callbacks, {callback, payload}); |
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| 25 | } |
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| 26 | |
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| 27 | void __cxa_finalize(void *dso) { |
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| 28 | if (!dso) { |
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| 29 | call_exit_callbacks(atexit_callbacks); |
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| 30 | if (teardown_main_tls) |
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| 31 | teardown_main_tls(); |
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| 32 | } |
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| 33 | } |
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| 34 | |
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| 35 | } // extern "C" |
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| 36 | |
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| 37 | LLVM_LIBC_FUNCTION(int, atexit, (__atexithandler_t callback)) { |
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| 38 | return add_atexit_unit( |
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| 39 | atexit_callbacks, |
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| 40 | {&stdc_at_exit_func, reinterpret_cast<void *>(callback)}); |
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| 41 | } |
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| 42 | |
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| 43 | } // namespace LIBC_NAMESPACE_DECL |
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| 44 | |
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