condition_variable.cpp revision 227983 
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    int e = pthread_cond_destroy(&__cv_);
20//     assert(e == 0);
21}
22
23void
24condition_variable::notify_one()
25{
26    pthread_cond_signal(&__cv_);
27}
28
29void
30condition_variable::notify_all()
31{
32    pthread_cond_broadcast(&__cv_);
33}
34
35void
36condition_variable::wait(unique_lock<mutex>& lk)
37{
38    if (!lk.owns_lock())
39        __throw_system_error(EPERM,
40                                  "condition_variable::wait: mutex not locked");
41    int ec = pthread_cond_wait(&__cv_, lk.mutex()->native_handle());
42    if (ec)
43        __throw_system_error(ec, "condition_variable wait failed");
44}
45
46void
47condition_variable::__do_timed_wait(unique_lock<mutex>& lk,
48               chrono::time_point<chrono::system_clock, chrono::nanoseconds> tp)
49{
50    using namespace chrono;
51    if (!lk.owns_lock())
52        __throw_system_error(EPERM,
53                            "condition_variable::timed wait: mutex not locked");
54    nanoseconds d = tp.time_since_epoch();
55    timespec ts;
56    seconds s = duration_cast<seconds>(d);
57    ts.tv_sec = static_cast<decltype(ts.tv_sec)>(s.count());
58    ts.tv_nsec = static_cast<decltype(ts.tv_nsec)>((d - s).count());
59    int ec = pthread_cond_timedwait(&__cv_, lk.mutex()->native_handle(), &ts);
60    if (ec != 0 && ec != ETIMEDOUT)
61        __throw_system_error(ec, "condition_variable timed_wait failed");
62}
63
64void
65notify_all_at_thread_exit(condition_variable& cond, unique_lock<mutex> lk)
66{
67    __thread_local_data()->notify_all_at_thread_exit(&cond, lk.release());
68}
69
70_LIBCPP_END_NAMESPACE_STD
71