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/forward.h>
11 #include <simgrid/chrono.hpp>
12 #include <simgrid/s4u/Mutex.hpp>
19 /** @brief A condition variable
22 * This is a drop-in replacement of `std::condition_variable` and should respect the same
23 * semantic. But we currently use (only) double for both durations and
26 class XBT_PUBLIC ConditionVariable {
28 friend kernel::activity::ConditionVariableImpl;
29 kernel::activity::ConditionVariableImpl* const cond_;
32 explicit ConditionVariable(kernel::activity::ConditionVariableImpl* cond) : cond_(cond) {}
33 ConditionVariable(ConditionVariable const&) = delete;
34 ConditionVariable& operator=(ConditionVariable const&) = delete;
36 friend XBT_PUBLIC void intrusive_ptr_add_ref(ConditionVariable * cond);
37 friend XBT_PUBLIC void intrusive_ptr_release(ConditionVariable * cond);
39 static ConditionVariablePtr create();
41 // Wait functions without time:
43 void wait(MutexPtr lock);
44 void wait(std::unique_lock<Mutex> & lock);
45 template <class P> void wait(std::unique_lock<Mutex> & lock, P pred)
51 // Wait function taking a plain double as time:
53 std::cv_status wait_until(std::unique_lock<Mutex> & lock, double timeout_time);
54 std::cv_status wait_for(std::unique_lock<Mutex> & lock, double duration);
55 template <class P> bool wait_until(std::unique_lock<Mutex> & lock, double timeout_time, P pred)
58 if (this->wait_until(lock, timeout_time) == std::cv_status::timeout)
62 template <class P> bool wait_for(std::unique_lock<Mutex> & lock, double duration, P pred)
64 return this->wait_until(lock, SIMIX_get_clock() + duration, std::move(pred));
67 // Wait function taking a C++ style time:
69 template <class Rep, class Period, class P>
70 bool wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration, P pred)
72 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
73 return this->wait_for(lock, seconds.count(), pred);
75 template <class Rep, class Period>
76 std::cv_status wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration)
78 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
79 return this->wait_for(lock, seconds.count());
81 template <class Duration>
82 std::cv_status wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time)
84 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
85 return this->wait_until(lock, timeout_native.time_since_epoch().count());
87 template <class Duration, class P>
88 bool wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time, P pred)
90 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
91 return this->wait_until(lock, timeout_native.time_since_epoch().count(), std::move(pred));
101 } // namespace simgrid