# Free RTOS Pon Windows problem

**URL:** <https://forums.freertos.org/t/free-rtos-pon-windows-problem/5842>\
**Category:** Kernel\
**Created:** [March 9, 2016, 1:06pm UTC](https://forums.freertos.org/t/free-rtos-pon-windows-problem/5842 "2016-03-09T13:06:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://d2v6vdsk2p900z.cloudfront.net/original/1X/7fc8fdb729c645aab5b20282bbe34e57cb407be6.jpeg) [@system](https://forums.freertos.org/u/system)\
**Post date:** [March 9, 2016, 1:06pm UTC](https://forums.freertos.org/t/free-rtos-pon-windows-problem/5842/1 "2016-03-09T13:06:50Z")

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**[joe\_her](https://sourceforge.net/u/joe_her/)** wrote on [Wednesday, March 09, 2016](https://sourceforge.net/p/freertos/discussion/382005/thread/f248d09a/#bc7c):

I am running a FREERTOS simulation on windows, and sometimes the system stop responding. I can see that the infinit loop in prvSimulatedPeripheralTimer(), is executing, but nothing else (except a non FreeRTOS windows thread which deals with UDP packtes and continues to run).  
Where can I look for the problem?  
Thanks.  
Johanan

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**Author:** ![rtel](https://d3iykfbgfh8zhg.cloudfront.net/user_avatar/forums.freertos.org/rtel/32/31_2.png) [@rtel](https://forums.freertos.org/u/rtel)\
**Post date:** [March 9, 2016, 2:16pm UTC](https://forums.freertos.org/t/free-rtos-pon-windows-problem/5842/2 "2016-03-09T14:16:23Z")

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**[rtel](https://sourceforge.net/u/rtel/)** wrote on [Wednesday, March 09, 2016](https://sourceforge.net/p/freertos/discussion/382005/thread/f248d09a/#95e8):

Are you making any Windows system calls from RTOS tasks? Search for the phrase “system call” in the following archived thread for more info: [http://www.freertos.org/FreeRTOS\_Support\_Forum\_Archive/December\_2015/freertos\_Windows\_port\_and\_prvProcessSimulatedInterrupts\_33c73d4aj.html](http://www.freertos.org/FreeRTOS_Support_Forum_Archive/December_2015/freertos_Windows_port_and_prvProcessSimulatedInterrupts_33c73d4aj.html)