Question

Assume you have a system that does not provide a usleep(unsigned long usec) call to suspend the execution of the thread for a given amount of time, say in ?secs. how would you implement this function using condition variables?

Answer 1

#include <iostream>

#include <time.h>

using namespace std;

//usleep function declaration

void usleep(int microseconds);

//usleep function definition

void usleep(int microseconds) // Cross-platform sleep function

{

clock_t time_end;

time_end = clock() + microseconds * CLOCKS_PER_SEC / 1000000; //as 1 microsecond is 1/1000000 of a second.

while (clock() < time_end);

}

int main()

{

cout << "Before calling User defined usleep" << endl;

usleep(4000000);

cout << "After calling User defined usleep" << endl;

}