sleep.hpp

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#pragma once
 
/// @file userver/engine/sleep.hpp
/// @brief Time-based coroutine suspension helpers
 
#include <chrono>
 
#include <userver/engine/deadline.hpp>
 
USERVER_NAMESPACE_BEGIN
 
namespace engine {
 
/// @brief Suspends execution for a brief period of time, possibly allowing
/// other tasks to execute
void Yield();
 
/// @cond
/// Recursion stoppers/specializations
void InterruptibleSleepUntil(Deadline);
void SleepUntil(Deadline);
/// @endcond
 
/// Suspends execution for at least the specified amount of time or until the
/// current task is cancelled. If already cancelled, the call is equivalent to
/// Yield.
template <typename Rep, typename Period>
void InterruptibleSleepFor(const std::chrono::duration<Rep, Period>& duration) {
  InterruptibleSleepUntil(Deadline::FromDuration(duration));
}
 
/// Suspends execution until the specified time point is reached or until the
/// current task is cancelled. If already cancelled, the call is equivalent to
/// Yield.
template <typename Clock, typename Duration>
void InterruptibleSleepUntil(
    const std::chrono::time_point<Clock, Duration>& time_point) {
  InterruptibleSleepUntil(Deadline::FromTimePoint(time_point));
}
 
/// Suspends execution for at least a specified amount of time
template <typename Rep, typename Period>
void SleepFor(const std::chrono::duration<Rep, Period>& duration) {
  SleepUntil(Deadline::FromDuration(duration));
}
 
/// Suspends execution until the specified time point is reached
template <typename Clock, typename Duration>
void SleepUntil(const std::chrono::time_point<Clock, Duration>& time_point) {
  SleepUntil(Deadline::FromTimePoint(time_point));
}
 
}  // namespace engine
 
USERVER_NAMESPACE_END