1 //===-------------------- condition_variable.cpp --------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "condition_variable" 11 #include "thread" 12 #include "system_error" 13 #include "cassert" 14 15 _LIBCPP_BEGIN_NAMESPACE_STD 16 17 condition_variable::~condition_variable() 18 { 19 pthread_cond_destroy(&__cv_); 20 } 21 22 void 23 condition_variable::notify_one() _NOEXCEPT 24 { 25 pthread_cond_signal(&__cv_); 26 } 27 28 void 29 condition_variable::notify_all() _NOEXCEPT 30 { 31 pthread_cond_broadcast(&__cv_); 32 } 33 34 void 35 condition_variable::wait(unique_lock<mutex>& lk) 36 { 37 if (!lk.owns_lock()) 38 __throw_system_error(EPERM, 39 "condition_variable::wait: mutex not locked"); 40 int ec = pthread_cond_wait(&__cv_, lk.mutex()->native_handle()); 41 if (ec) 42 __throw_system_error(ec, "condition_variable wait failed"); 43 } 44 45 void 46 condition_variable::__do_timed_wait(unique_lock<mutex>& lk, 47 chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) 48 { 49 using namespace chrono; 50 if (!lk.owns_lock()) 51 __throw_system_error(EPERM, 52 "condition_variable::timed wait: mutex not locked"); 53 nanoseconds d = tp.time_since_epoch(); 54 if (d > nanoseconds(0x59682F000000E941)) 55 d = nanoseconds(0x59682F000000E941); 56 timespec ts; 57 seconds s = duration_cast<seconds>(d); 58 typedef decltype(ts.tv_sec) ts_sec; 59 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max(); 60 if (s.count() < ts_sec_max) 61 { 62 ts.tv_sec = static_cast<ts_sec>(s.count()); 63 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count()); 64 } 65 else 66 { 67 ts.tv_sec = ts_sec_max; 68 ts.tv_nsec = giga::num - 1; 69 } 70 int ec = pthread_cond_timedwait(&__cv_, lk.mutex()->native_handle(), &ts); 71 if (ec != 0 && ec != ETIMEDOUT) 72 __throw_system_error(ec, "condition_variable timed_wait failed"); 73 } 74 75 void 76 notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk) 77 { 78 __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release()); 79 } 80 81 _LIBCPP_END_NAMESPACE_STD 82
