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
notify_one()29 condition_variable::notify_one() noexcept
30 {
31 __libcpp_condvar_signal(&__cv_);
32 }
33
34 void
notify_all()35 condition_variable::notify_all() noexcept
36 {
37 __libcpp_condvar_broadcast(&__cv_);
38 }
39
40 void
wait(unique_lock<mutex> & lk)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
__do_timed_wait(unique_lock<mutex> & lk,chrono::time_point<chrono::system_clock,chrono::nanoseconds> tp)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
notify_all_at_thread_exit(condition_variable & cond,unique_lock<mutex> lk)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