Help me please

[oceans]

Dear Friend,

 

I wish to insert “usleep()” in a while loop.

 

“

While(not right)

{

Usleep(100);

}

 

Ok it is right, do something, bla bla bla …

 

“

I was advised usleep() will soak up server resource. How can I improve or use an alternative.

 

I admit I have done such operation in VB, I had such problem, and I later developed my own sleep function call which used almost no resource.

 

But I am not sure if usleep() is efficient, have you experienced this? Any comment.

[trq]

The question is why? Why would you need this in a web environment?

[hvle]

Interesting!

 

I have just test it out on my system. 

 

usleep(50000000); // sleep for 50 seconds

 

and watch the system resource and performance.

 

I found no resource being used.  CPU idle is 100%.  Memory used does not change.

 

I guest it is safe-to-use function.

 

os: xp pro

php version: 5

 

[trq]

Same with sleep, still doesn't answer my question. I just can't see a need for it.

[hvle]

I remembered one time when I tried to test the server time out value, I think it was file upload time out.  Instead of dumping out a big upload file, I set the script to wait 15.1 minutes (upload time out is set at 15). 

 

But you right, I never encounter a situation where I must delay the script execution.

[oceans]

OK Friends,

I will use this to prevent multi threaded operations.

In a very unlikely event (1/infinity) probability, if one global function gets called by B before A has done with the function, use usleep for B to wait till A is done.