| 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 | #include <condition_variable> |
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| 10 | #include <limits> |
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| 11 | #include <ratio> |
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| 12 | #include <thread> |
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| 13 | #include <__chrono/duration.h> |
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| 14 | #include <__chrono/system_clock.h> |
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| 15 | #include <__chrono/time_point.h> |
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| 16 | #include <__system_error/throw_system_error.h> |
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| 17 | |
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| 18 | #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB) |
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| 19 | # pragma comment(lib, "pthread") |
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| 20 | #endif |
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| 21 | |
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| 22 | _LIBCPP_PUSH_MACROS |
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| 23 | #include <__undef_macros> |
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| 24 | |
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| 25 | _LIBCPP_BEGIN_NAMESPACE_STD |
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| 26 | |
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| 27 | // ~condition_variable is defined elsewhere. |
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| 28 | |
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| 29 | void condition_variable::notify_one() noexcept { __libcpp_condvar_signal(&__cv_); } |
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| 30 | |
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| 31 | void condition_variable::notify_all() noexcept { __libcpp_condvar_broadcast(&__cv_); } |
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| 32 | |
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| 33 | void condition_variable::wait(unique_lock<mutex>& lk) noexcept { |
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| 34 | if (!lk.owns_lock()) |
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| 35 | std::__throw_system_error(EPERM, "condition_variable::wait: mutex not locked" ); |
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| 36 | int ec = __libcpp_condvar_wait(&__cv_, lk.mutex()->native_handle()); |
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| 37 | if (ec) |
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| 38 | std::__throw_system_error(ec, "condition_variable wait failed" ); |
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| 39 | } |
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| 40 | |
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| 41 | void condition_variable::__do_timed_wait(unique_lock<mutex>& lk, |
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| 42 | chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) noexcept { |
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| 43 | using namespace chrono; |
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| 44 | if (!lk.owns_lock()) |
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| 45 | std::__throw_system_error(EPERM, "condition_variable::timed wait: mutex not locked" ); |
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| 46 | nanoseconds d = tp.time_since_epoch(); |
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| 47 | if (d > nanoseconds(0x59682F000000E941)) |
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| 48 | d = nanoseconds(0x59682F000000E941); |
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| 49 | __libcpp_timespec_t ts; |
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| 50 | seconds s = duration_cast<seconds>(d); |
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| 51 | typedef decltype(ts.tv_sec) ts_sec; |
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| 52 | constexpr ts_sec ts_sec_max = numeric_limits<ts_sec>::max(); |
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| 53 | if (s.count() < ts_sec_max) { |
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| 54 | ts.tv_sec = static_cast<ts_sec>(s.count()); |
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| 55 | ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count()); |
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| 56 | } else { |
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| 57 | ts.tv_sec = ts_sec_max; |
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| 58 | ts.tv_nsec = giga::num - 1; |
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| 59 | } |
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| 60 | int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts); |
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| 61 | if (ec != 0 && ec != ETIMEDOUT) |
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| 62 | std::__throw_system_error(ec, "condition_variable timed_wait failed" ); |
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| 63 | } |
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| 64 | |
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| 65 | void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk) { |
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| 66 | auto& tl_ptr = __thread_local_data(); |
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| 67 | // If this thread was not created using std::thread then it will not have |
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| 68 | // previously allocated. |
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| 69 | if (tl_ptr.get() == nullptr) { |
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| 70 | tl_ptr.set_pointer(new __thread_struct); |
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| 71 | } |
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| 72 | __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release()); |
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| 73 | } |
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| 74 | |
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| 75 | _LIBCPP_END_NAMESPACE_STD |
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| 76 | |
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| 77 | _LIBCPP_POP_MACROS |
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| 78 | |
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