How to Implement Sleep Functionality in C ?

Sleep Functionality in C

In C , developers often encounter the need to pause program execution for a specific duration, similar to the Sleep() function in other programming languages. This article aims to address that requirement and provide comprehensive solutions.

std::this_thread::sleep_for

C 11 introduced the and headers, providing a cross-platform standard for thread manipulation. To pause the program for a specified number of milliseconds, the std::this_thread::sleep_for function can be employed.

<code class="cpp">#include <chrono>
#include <thread>

std::chrono::milliseconds timespan(111605); // or whatever

std::this_thread::sleep_for(timespan);</thread></chrono></code>

std::this_thread::sleep_until

An alternative to std::this_thread::sleep_for is std::this_thread::sleep_until, which allows pausing until a specific point in time is reached.

Pre-C 11 Solutions

Before C 11, C lacked thread capabilities and sleep functionality. As such, platform-dependent solutions were necessary. Here's an example that works for both Windows and Unix:

<code class="cpp">#ifdef _WIN32
    #include <windows.h>

    void sleep(unsigned milliseconds)
    {
        Sleep(milliseconds);
    }
#else
    #include <unistd.h>
    
    void sleep(unsigned milliseconds)
    {
        usleep(milliseconds * 1000); // takes microseconds
    }
#endif</unistd.h></windows.h></code>

Alternatively, boost::this_thread::sleep can be used as a simpler pre-C 11 approach.

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