Question

Is it possible in C/C++, to “abandon” thread’s CPU time?
For example:

void wait(int s) //Low cpu usage
{
 int tmp = time();
 while(tmp + CLOCKS_PER_SEC * s > time())
  __AbandonCPUTime();
  //Tell cpu to do sth else.
}

I’ve tried Sleep(0), but it doesn’t work.

Answer 1

Look at C++11’s:

#include <thread>
std::this_thread::yield();

Your CPU may support the _mm_pause() intrinsic (__asm__("pause") for gcc) which may or may not help you.

Otherwise you’ll be looking at OS specific functions:
sched_yield() for pthreads on Linux, or SwitchToThread() on Windows