ios7 - NSThread High CPU usage -

im trying using continually running thread perform tasks @ high rate in app. in app have list of 1000 or time stamps. poll them until it's time , instruct ausampler play.

the problem have seem fundamentally not understand how nsthread works. in simple example below cpu shoots 100% despite no tasks being run.

in way using nsthread incorrectly? better way create a fast polling mechanism doesnt hog cpu?

mythread =[[nsthread alloc]initwithtarget:self selector:@selector(test) object:nil];             [audiothread setthreadpriority:0];             [audiothread start];   -(void)test  {     while(mycondition)  {     // work   // cpu == 100% }  } 

the solution find minimum interval between sampler fire times (based on bpm/ resolution) , make thread sleep amount.