1 /* Copyright (c) 2006-2019. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_S4U_COND_VARIABLE_HPP
7 #define SIMGRID_S4U_COND_VARIABLE_HPP
9 #include <simgrid/chrono.hpp>
10 #include <simgrid/s4u/Mutex.hpp>
17 /** @brief A condition variable
20 * This is a drop-in replacement of `std::condition_variable` and should respect the same
21 * semantic. But we currently use (only) double for both durations and
24 class XBT_PUBLIC ConditionVariable {
26 friend kernel::activity::ConditionVariableImpl;
27 kernel::activity::ConditionVariableImpl* const cond_;
29 explicit ConditionVariable(kernel::activity::ConditionVariableImpl* cond) : cond_(cond) {}
32 ConditionVariable(ConditionVariable const&) = delete;
33 ConditionVariable& operator=(ConditionVariable const&) = delete;
35 friend XBT_PUBLIC void intrusive_ptr_add_ref(ConditionVariable * cond);
36 friend XBT_PUBLIC void intrusive_ptr_release(ConditionVariable * cond);
38 static ConditionVariablePtr create();
40 // Wait functions without time:
42 void wait(MutexPtr lock);
43 void wait(std::unique_lock<Mutex> & lock);
44 template <class P> void wait(std::unique_lock<Mutex> & lock, P pred)
50 // Wait function taking a plain double as time:
52 std::cv_status wait_until(std::unique_lock<Mutex> & lock, double timeout_time);
53 std::cv_status wait_for(std::unique_lock<Mutex> & lock, double duration);
54 template <class P> bool wait_until(std::unique_lock<Mutex> & lock, double timeout_time, P pred)
57 if (this->wait_until(lock, timeout_time) == std::cv_status::timeout)
61 template <class P> bool wait_for(std::unique_lock<Mutex> & lock, double duration, P pred)
63 return this->wait_until(lock, SIMIX_get_clock() + duration, std::move(pred));
66 // Wait function taking a C++ style time:
68 template <class Rep, class Period, class P>
69 bool wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration, P pred)
71 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
72 return this->wait_for(lock, seconds.count(), pred);
74 template <class Rep, class Period>
75 std::cv_status wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration)
77 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
78 return this->wait_for(lock, seconds.count());
80 template <class Duration>
81 std::cv_status wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time)
83 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
84 return this->wait_until(lock, timeout_native.time_since_epoch().count());
86 template <class Duration, class P>
87 bool wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time, P pred)
89 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
90 return this->wait_until(lock, timeout_native.time_since_epoch().count(), std::move(pred));
100 } // namespace simgrid