iphone - is it ok to use usleep on a secondary thread on Grand Central Dispatch?

问题

I am adding a block to a queue (not the main queue), using Grand Central Dispatch. This block has a loop and between every passage of the loop a small delay of 0,02 seconds is required. I am using

dispatch_async(myOwnQueue, ^{
  // begin loop
  // do stuff
  usleep(20000);
  // end loop
});

on this queue. As it is not the main queue, it will not block the main thread.

The problem is that Xcode complains: warning: implicit declaration of function 'usleep'

Is there other way to do that?

thanks.

回答1:

You just need to include the appropriate header before calling usleep():

#include <unistd.h>

来源：https://stackoverflow.com/questions/4668634/iphone-is-it-ok-to-use-usleep-on-a-secondary-thread-on-grand-central-dispatch