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
17condition_variable::~condition_variable()
18{
19    pthread_cond_destroy(&__cv_);
20}
21
22void
23condition_variable::notify_one() _NOEXCEPT
24{
25    pthread_cond_signal(&__cv_);
26}
27
28void
29condition_variable::notify_all() _NOEXCEPT
30{
31    pthread_cond_broadcast(&__cv_);
32}
33
34void
35condition_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
45void
46condition_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
75void
76notify_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