contrib/libc++/src/condition_variable.cpp

   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
  17 condition_variable::~condition_variable()
  18 {
  19     int e = pthread_cond_destroy(&__cv_);
  20 //     assert(e == 0);
  21 }
  22
  23 void
  24 condition_variable::notify_one()
  25 {
  26     pthread_cond_signal(&__cv_);
  27 }
  28
  29 void
  30 condition_variable::notify_all()
  31 {
  32     pthread_cond_broadcast(&__cv_);
  33 }
  34
  35 void
  36 condition_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
  46 void
  47 condition_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
  64 void
  65 notify_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