1 /* Copyright (c) 2006-2018. 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
10 #include <condition_variable>
13 #include <utility> // std::swap
15 #include <boost/intrusive_ptr.hpp>
19 #include <simgrid/chrono.hpp>
20 #include <simgrid/s4u/Mutex.hpp>
21 #include <simgrid/simix.h>
26 /** @brief A condition variable
29 * This is a drop-in replacement of `std::condition_variable` and should respect the same
30 * semantic. But we currently use (only) double for both durations and
33 class XBT_PUBLIC ConditionVariable {
37 explicit ConditionVariable(smx_cond_t cond) : cond_(cond) {}
39 ConditionVariable(ConditionVariable const&) = delete;
40 ConditionVariable& operator=(ConditionVariable const&) = delete;
42 friend XBT_PUBLIC void intrusive_ptr_add_ref(ConditionVariable * cond);
43 friend XBT_PUBLIC void intrusive_ptr_release(ConditionVariable * cond);
44 using Ptr = boost::intrusive_ptr<ConditionVariable>;
46 static Ptr createConditionVariable();
48 // Wait functions without time:
50 void wait(MutexPtr lock);
51 void wait(std::unique_lock<Mutex> & lock);
52 template <class P> void wait(std::unique_lock<Mutex> & lock, P pred)
58 // Wait function taking a plain double as time:
60 std::cv_status wait_until(std::unique_lock<Mutex> & lock, double timeout_time);
61 std::cv_status wait_for(std::unique_lock<Mutex> & lock, double duration);
62 template <class P> bool wait_until(std::unique_lock<Mutex> & lock, double timeout_time, P pred)
65 if (this->wait_until(lock, timeout_time) == std::cv_status::timeout)
69 template <class P> bool wait_for(std::unique_lock<Mutex> & lock, double duration, P pred)
71 return this->wait_until(lock, SIMIX_get_clock() + duration, std::move(pred));
74 // Wait function taking a C++ style time:
76 template <class Rep, class Period, class P>
77 bool wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration, P pred)
79 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
80 return this->wait_for(lock, seconds.count(), pred);
82 template <class Rep, class Period>
83 std::cv_status wait_for(std::unique_lock<Mutex> & lock, std::chrono::duration<Rep, Period> duration)
85 auto seconds = std::chrono::duration_cast<SimulationClockDuration>(duration);
86 return this->wait_for(lock, seconds.count());
88 template <class Duration>
89 std::cv_status wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time)
91 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
92 return this->wait_until(lock, timeout_native.time_since_epoch().count());
94 template <class Duration, class P>
95 bool wait_until(std::unique_lock<Mutex> & lock, const SimulationTimePoint<Duration>& timeout_time, P pred)
97 auto timeout_native = std::chrono::time_point_cast<SimulationClockDuration>(timeout_time);
98 return this->wait_until(lock, timeout_native.time_since_epoch().count(), std::move(pred));
107 using ConditionVariablePtr = ConditionVariable::Ptr;
109 } // namespace simgrid::s4u