The thread which create by SDL_CreateThread work strange

[newcreat]

I create a thread: the thread may use a lot of CPU time

globle var progressbar=0;
main()
{
create The thread;
while(progressbar!=100)
draw the progressbar
}
the thread like this:
Thread()
{
computing..
update progressbar value;//has process 10%
.......
computing..
update progressbar value;//has process 100%

}
I find it work fine on Windows,but it is dosen't work on PSP.
On PSP the main is freezing until the thread return .
I dont know why?
thx for your help.

[jimparis]

The PSP does not do preemptive multithreading. The kernel will only switch threads when you call certain functions -- an easy way to ensure it can switch to a new thread is to call SDL_Delay(0) periodically.

[newcreat]

The PSP does not do preemptive multithreading. The kernel will only switch threads when you call certain functions -- an easy way to ensure it can switch to a new thread is to call SDL_Delay(0) periodically.

thank you very much,I'll try it!