[SOLVED] Function does not return

[angus.wood]

I have a long-running application. Because of a bug in the sleep() function https://developer.unigine.com/forum/topic/2638-accuracy-of-sleep-function/ I have replaced it with the function below.

 

The problem is that on some occaisions, sometimes after an 20 hours, sometimes after just a minute the function does not appear to return and the Unigine process locks up and must be killed.

 

Can anyone see anything wrong with this?

 

Edit: the code is called by a thread that is started from init(). The update() function is empty and all work is done in the thread.

void mysleep(float howlong) {


  float now = clock();
  float then = now + howlong;
  log.message("Sleep enter for [%f]\n",howlong);

  while(clock() <= then) {
    usleep(1);
    wait;
  }
  log.message("Sleep done\n");

}

[ulf.schroeter]

As always for such kind of errors: test code for error reproduction would be helpful

[steve.learmonth]

Do you have a single script thread or multiple (where more than one could be executing mysleep) ? 

 

Is this on Windows? Does the problem still occur if you remove the usleep? 

 

Out of interest, why call usleep? By using "wait", the time between each iteration of your loop will be the inverse frame rate anyway..

[angus.wood]

> Do you have a single script thread or multiple (where more than one could be executing mysleep) ? 

 

No, just one thread executing.

 

>  Is this on Windows? Does the problem still occur if you remove the usleep? 

 

Yes, windows only and the problem still occurs without the usleep. In fact I tried it first without and added that in to mitigate the lockups.

 

> Out of interest, why call usleep? By using "wait", the time between each iteration of your loop will be the inverse frame rate anyway..

 

The real issue I'm trying to get to is that the sleep() function becomes wildly inaccurate after the engine has been running for more than about 10 hours. For example a sleep(0.1) call may take up to 3 minutes to execute. I am trying everything I can think of to work around the issue.

[silent]

Hi,

 

I belive we can close this topic. Here the solution that working correctly:
 

void mysleep(float howlong) {
    float current[];
    current[get_thread()] = howlong;
   
    while(current[get_thread()] > 0.0f) {
        current[get_thread()] -= engine.game.getFTime();
        wait;

    }
}