| 1 | //===----------------------------------------------------------------------===// |
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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 | // UNSUPPORTED: no-threads |
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| 10 | |
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| 11 | // <thread> |
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| 12 | |
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| 13 | // class thread |
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| 14 | |
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| 15 | // void detach(); |
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| 16 | |
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| 17 | #include <thread> |
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| 18 | #include <atomic> |
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| 19 | #include <system_error> |
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| 20 | #include <cassert> |
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| 21 | |
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| 22 | #include "make_test_thread.h" |
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| 23 | #include "test_macros.h" |
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| 24 | |
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| 25 | std::atomic_bool done(false); |
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| 26 | |
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| 27 | class G |
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| 28 | { |
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| 29 | int alive_; |
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| 30 | bool done_; |
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| 31 | public: |
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| 32 | static int n_alive; |
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| 33 | static bool op_run; |
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| 34 | |
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| 35 | G() : alive_(1), done_(false) |
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| 36 | { |
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| 37 | ++n_alive; |
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| 38 | } |
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| 39 | |
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| 40 | G(const G& g) : alive_(g.alive_), done_(false) |
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| 41 | { |
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| 42 | ++n_alive; |
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| 43 | } |
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| 44 | ~G() |
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| 45 | { |
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| 46 | alive_ = 0; |
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| 47 | --n_alive; |
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| 48 | if (done_) done = true; |
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| 49 | } |
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| 50 | |
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| 51 | void operator()() |
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| 52 | { |
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| 53 | assert(alive_ == 1); |
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| 54 | assert(n_alive >= 1); |
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| 55 | op_run = true; |
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| 56 | done_ = true; |
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| 57 | } |
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| 58 | }; |
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| 59 | |
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| 60 | int G::n_alive = 0; |
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| 61 | bool G::op_run = false; |
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| 62 | |
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| 63 | void foo() { done = true; } |
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| 64 | |
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| 65 | int main(int, char**) |
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| 66 | { |
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| 67 | { |
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| 68 | G g; |
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| 69 | std::thread t0 = support::make_test_thread(g); |
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| 70 | assert(t0.joinable()); |
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| 71 | t0.detach(); |
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| 72 | assert(!t0.joinable()); |
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| 73 | while (!done) {} |
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| 74 | assert(G::op_run); |
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| 75 | assert(G::n_alive == 1); |
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| 76 | } |
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| 77 | assert(G::n_alive == 0); |
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| 78 | done = false; |
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| 79 | #ifndef TEST_HAS_NO_EXCEPTIONS |
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| 80 | { |
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| 81 | std::thread t0 = support::make_test_thread(foo); |
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| 82 | assert(t0.joinable()); |
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| 83 | t0.detach(); |
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| 84 | assert(!t0.joinable()); |
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| 85 | try { |
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| 86 | t0.detach(); |
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| 87 | } catch (std::system_error const&) { |
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| 88 | } |
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| 89 | // Wait to make sure that the detached thread has started up. |
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| 90 | // Without this, we could exit main and start destructing global |
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| 91 | // resources that are needed when the thread starts up, while the |
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| 92 | // detached thread would start up only later. |
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| 93 | while (!done) {} |
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| 94 | } |
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| 95 | #endif |
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| 96 | |
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| 97 | return 0; |
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| 98 | } |
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| 99 | |
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