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 <__config> 10 11 #ifndef _LIBCPP_HAS_NO_THREADS 12 13 #include <condition_variable> 14 #include <thread> 15 #include <system_error> 16 17 #if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB) 18 # pragma comment(lib, "pthread") 19 #endif 20 21 _LIBCPP_PUSH_MACROS 22 #include <__undef_macros> 23 24 _LIBCPP_BEGIN_NAMESPACE_STD 25 26 // ~condition_variable is defined elsewhere. 27 28 void 29 condition_variable::notify_one() noexcept 30 { 31 __libcpp_condvar_signal(&__cv_); 32 } 33 34 void 35 condition_variable::notify_all() noexcept 36 { 37 __libcpp_condvar_broadcast(&__cv_); 38 } 39 40 void 41 condition_variable::wait(unique_lock<mutex>& lk) noexcept 42 { 43 if (!lk.owns_lock()) 44 __throw_system_error(EPERM, 45 "condition_variable::wait: mutex not locked"); 46 int ec = __libcpp_condvar_wait(&__cv_, lk.mutex()->native_handle()); 47 if (ec) 48 __throw_system_error(ec, "condition_variable wait failed"); 49 } 50 51 void 52 condition_variable::__do_timed_wait(unique_lock<mutex>& lk, 53 chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) noexcept 54 { 55 using namespace chrono; 56 if (!lk.owns_lock()) 57 __throw_system_error(EPERM, 58 "condition_variable::timed wait: mutex not locked"); 59 nanoseconds d = tp.time_since_epoch(); 60 if (d > nanoseconds(0x59682F000000E941)) 61 d = nanoseconds(0x59682F000000E941); 62 __libcpp_timespec_t ts; 63 seconds s = duration_cast<seconds>(d); 64 typedef decltype(ts.tv_sec) ts_sec; 65 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max(); 66 if (s.count() < ts_sec_max) 67 { 68 ts.tv_sec = static_cast<ts_sec>(s.count()); 69 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count()); 70 } 71 else 72 { 73 ts.tv_sec = ts_sec_max; 74 ts.tv_nsec = giga::num - 1; 75 } 76 int ec = __libcpp_condvar_timedwait(&__cv_, lk.mutex()->native_handle(), &ts); 77 if (ec != 0 && ec != ETIMEDOUT) 78 __throw_system_error(ec, "condition_variable timed_wait failed"); 79 } 80 81 void 82 notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk) 83 { 84 auto& tl_ptr = __thread_local_data(); 85 // If this thread was not created using std::thread then it will not have 86 // previously allocated. 87 if (tl_ptr.get() == nullptr) { 88 tl_ptr.set_pointer(new __thread_struct); 89 } 90 __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release()); 91 } 92 93 _LIBCPP_END_NAMESPACE_STD 94 95 _LIBCPP_POP_MACROS 96 97 #endif // !_LIBCPP_HAS_NO_THREADS 98