1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include <condition_variable> 10 #include <limits> 11 #include <ratio> 12 #include <thread> 13 #include <__chrono/duration.h> 14 #include <__chrono/system_clock.h> 15 #include <__chrono/time_point.h> 16 #include <__system_error/throw_system_error.h> 17 18 #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB) 19 # pragma comment(lib, "pthread") 20 #endif 21 22 _LIBCPP_PUSH_MACROS 23 #include <__undef_macros> 24 25 _LIBCPP_BEGIN_NAMESPACE_STD 26 27 // ~condition_variable is defined elsewhere. 28 29 void condition_variable::notify_one() noexcept { __libcpp_condvar_signal(&__cv_); } 30 31 void condition_variable::notify_all() noexcept { __libcpp_condvar_broadcast(&__cv_); } 32 33 void condition_variable::wait(unique_lock<mutex>& lk) noexcept { 34 if (!lk.owns_lock()) 35 std::__throw_system_error(EPERM, "condition_variable::wait: mutex not locked"); 36 int ec = __libcpp_condvar_wait(&__cv_, lk.mutex()->native_handle()); 37 if (ec) 38 std::__throw_system_error(ec, "condition_variable wait failed"); 39 } 40 41 void condition_variable::__do_timed_wait(unique_lock<mutex>& lk, 42 chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) noexcept { 43 using namespace chrono; 44 if (!lk.owns_lock()) 45 std::__throw_system_error(EPERM, "condition_variable::timed wait: mutex not locked"); 46 nanoseconds d = tp.time_since_epoch(); 47 if (d > nanoseconds(0x59682F000000E941)) 48 d = nanoseconds(0x59682F000000E941); 49 __libcpp_timespec_t ts; 50 seconds s = duration_cast<seconds>(d); 51 typedef decltype(ts.tv_sec) ts_sec; 52 constexpr ts_sec ts_sec_max = numeric_limits<ts_sec>::max(); 53 if (s.count() < ts_sec_max) { 54 ts.tv_sec = static_cast<ts_sec>(s.count()); 55 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count()); 56 } else { 57 ts.tv_sec = ts_sec_max; 58 ts.tv_nsec = giga::num - 1; 59 } 60 int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts); 61 if (ec != 0 && ec != ETIMEDOUT) 62 std::__throw_system_error(ec, "condition_variable timed_wait failed"); 63 } 64 65 void notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk) { 66 auto& tl_ptr = __thread_local_data(); 67 // If this thread was not created using std::thread then it will not have 68 // previously allocated. 69 if (tl_ptr.get() == nullptr) { 70 tl_ptr.set_pointer(new __thread_struct); 71 } 72 __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release()); 73 } 74 75 _LIBCPP_END_NAMESPACE_STD 76 77 _LIBCPP_POP_MACROS 78