Difference between revisions of "cpp/thread/sleep for"
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(if you're going to measure the real sleep, at least show with enough precision...) |
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{{cpp/title|n=this_thread::|sleep_for}} | {{cpp/title|n=this_thread::|sleep_for}} | ||
{{cpp/thread/navbar}} | {{cpp/thread/navbar}} | ||
| − | {{ddcl | header=thread | since=c++11 | 1= | + | {{ddcl|header=thread|since=c++11|1= |
template< class Rep, class Period > | template< class Rep, class Period > | ||
void sleep_for( const std::chrono::duration<Rep, Period>& sleep_duration ); | void sleep_for( const std::chrono::duration<Rep, Period>& sleep_duration ); | ||
}} | }} | ||
| − | Blocks the execution of the current thread for ''at least'' the specified {{ | + | Blocks the execution of the current thread for ''at least'' the specified {{c|sleep_duration}}. |
| − | + | This function may block for longer than {{c|sleep_duration}} due to scheduling or resource contention delays. | |
| + | |||
| + | The standard recommends that a steady clock is used to measure the duration. If an implementation uses a system clock instead, the wait time may also be sensitive to clock adjustments. | ||
===Parameters=== | ===Parameters=== | ||
{{par begin}} | {{par begin}} | ||
| − | {{par | sleep_duration | time duration to sleep}} | + | {{par|sleep_duration|time duration to sleep}} |
{{par end}} | {{par end}} | ||
| Line 19: | Line 21: | ||
===Exceptions=== | ===Exceptions=== | ||
| − | Any exception thrown by clock, time_point, or duration during the execution (clocks, time points, and durations provided by the standard library never throw) | + | Any exception thrown by {{tt|clock}}, {{tt|time_point}}, or {{tt|duration}} during the execution (clocks, time points, and durations provided by the standard library never throw). |
===Example=== | ===Example=== | ||
| − | {{example | + | {{example |
| − | + | |code= | |
| − | + | ||
#include <chrono> | #include <chrono> | ||
| + | #include <iostream> | ||
#include <thread> | #include <thread> | ||
int main() | int main() | ||
{ | { | ||
| − | std::cout << "Hello waiter" << std:: | + | using namespace std::chrono_literals; |
| − | + | ||
| − | auto start = std::chrono::high_resolution_clock::now(); | + | std::cout << "Hello waiter\n" << std::flush; |
| − | std::this_thread::sleep_for( | + | |
| − | auto end = std::chrono::high_resolution_clock::now(); | + | const auto start = std::chrono::high_resolution_clock::now(); |
| − | std::chrono::duration<double, std::milli> elapsed = end-start; | + | std::this_thread::sleep_for(2000ms); |
| − | std::cout << "Waited " << elapsed | + | const auto end = std::chrono::high_resolution_clock::now(); |
| + | const std::chrono::duration<double, std::milli> elapsed = end - start; | ||
| + | |||
| + | std::cout << "Waited " << elapsed << '\n'; | ||
} | } | ||
| − | + | |p=true | |
| + | |output= | ||
Hello waiter | Hello waiter | ||
| − | Waited 2000. | + | Waited 2000.13 ms |
}} | }} | ||
===See also=== | ===See also=== | ||
{{dsc begin}} | {{dsc begin}} | ||
| − | {{dsc inc | cpp/thread/dsc sleep_until}} | + | {{dsc inc|cpp/thread/dsc sleep_until}} |
{{dsc end}} | {{dsc end}} | ||
| − | + | {{langlinks|de|es|fr|it|ja|pt|ru|zh}} | |
| − | + | ||
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Latest revision as of 10:26, 23 October 2023
| Defined in header <thread>
|
||
| template< class Rep, class Period > void sleep_for( const std::chrono::duration<Rep, Period>& sleep_duration ); |
(since C++11) | |
Blocks the execution of the current thread for at least the specified sleep_duration.
This function may block for longer than sleep_duration due to scheduling or resource contention delays.
The standard recommends that a steady clock is used to measure the duration. If an implementation uses a system clock instead, the wait time may also be sensitive to clock adjustments.
Contents |
[edit] Parameters
| sleep_duration | - | time duration to sleep |
[edit] Return value
(none)
[edit] Exceptions
Any exception thrown by clock, time_point, or duration during the execution (clocks, time points, and durations provided by the standard library never throw).
[edit] Example
Run this code
#include <chrono> #include <iostream> #include <thread> int main() { using namespace std::chrono_literals; std::cout << "Hello waiter\n" << std::flush; const auto start = std::chrono::high_resolution_clock::now(); std::this_thread::sleep_for(2000ms); const auto end = std::chrono::high_resolution_clock::now(); const std::chrono::duration<double, std::milli> elapsed = end - start; std::cout << "Waited " << elapsed << '\n'; }
Possible output:
Hello waiter Waited 2000.13 ms
[edit] See also
| (C++11) |
stops the execution of the current thread until a specified time point (function) |
