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
~condition_variable()17 condition_variable::~condition_variable()
18 {
19 pthread_cond_destroy(&__cv_);
20 }
21
22 void
notify_one()23 condition_variable::notify_one() _NOEXCEPT
24 {
25 pthread_cond_signal(&__cv_);
26 }
27
28 void
notify_all()29 condition_variable::notify_all() _NOEXCEPT
30 {
31 pthread_cond_broadcast(&__cv_);
32 }
33
34 void
wait(unique_lock<mutex> & lk)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
__do_timed_wait(unique_lock<mutex> & lk,chrono::time_point<chrono::system_clock,chrono::nanoseconds> tp)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
notify_all_at_thread_exit(condition_variable & cond,unique_lock<mutex> lk)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