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 #if !_LIBCPP_SINGLE_THREADED
16
17 _LIBCPP_BEGIN_NAMESPACE_STD
18
~condition_variable()19 condition_variable::~condition_variable()
20 {
21 pthread_cond_destroy(&__cv_);
22 }
23
24 void
notify_one()25 condition_variable::notify_one() _NOEXCEPT
26 {
27 pthread_cond_signal(&__cv_);
28 }
29
30 void
notify_all()31 condition_variable::notify_all() _NOEXCEPT
32 {
33 pthread_cond_broadcast(&__cv_);
34 }
35
36 void
wait(unique_lock<mutex> & lk)37 condition_variable::wait(unique_lock<mutex>& lk) _NOEXCEPT
38 {
39 if (!lk.owns_lock())
40 __throw_system_error(EPERM,
41 "condition_variable::wait: mutex not locked");
42 int ec = pthread_cond_wait(&__cv_, lk.mutex()->native_handle());
43 if (ec)
44 __throw_system_error(ec, "condition_variable wait failed");
45 }
46
47 void
__do_timed_wait(unique_lock<mutex> & lk,chrono::time_point<chrono::system_clock,chrono::nanoseconds> tp)48 condition_variable::__do_timed_wait(unique_lock<mutex>& lk,
49 chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp) _NOEXCEPT
50 {
51 using namespace chrono;
52 if (!lk.owns_lock())
53 __throw_system_error(EPERM,
54 "condition_variable::timed wait: mutex not locked");
55 nanoseconds d = tp.time_since_epoch();
56 if (d > nanoseconds(0x59682F000000E941))
57 d = nanoseconds(0x59682F000000E941);
58 timespec ts;
59 seconds s = duration_cast<seconds>(d);
60 typedef decltype(ts.tv_sec) ts_sec;
61 _LIBCPP_CONSTEXPR ts_sec ts_sec_max = numeric_limits<ts_sec>::max();
62 if (s.count() < ts_sec_max)
63 {
64 ts.tv_sec = static_cast<ts_sec>(s.count());
65 ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
66 }
67 else
68 {
69 ts.tv_sec = ts_sec_max;
70 ts.tv_nsec = giga::num - 1;
71 }
72 int ec = pthread_cond_timedwait(&__cv_, lk.mutex()->native_handle(), &ts);
73 if (ec != 0 && ec != ETIMEDOUT)
74 __throw_system_error(ec, "condition_variable timed_wait failed");
75 }
76
77 void
notify_all_at_thread_exit(condition_variable & cond,unique_lock<mutex> lk)78 notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk)
79 {
80 __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release());
81 }
82
83 _LIBCPP_END_NAMESPACE_STD
84
85 #endif // !_LIBCPP_SINGLE_THREADED
86
87