Messages in this thread | | | Date | Thu, 17 Jan 2008 11:19:07 +0100 (CET) | Subject | SCHED_FIFO & system() | From | linux@sundmang ... |
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Hello, I have some strange behavior in one of my systems.
I have a real-time kernel thread under SCHED_FIFO which is running every 10ms. It is blocking on a semaphore and released by a timer interrupt every 10ms. Generally this works really well.
However, there is a module in the system that makes a / system() / call from c-code in user-space;
system("run_my_script");
By calling and running a bash script. Independent of how the actual script looks like the real time kernel thread does not get scheduled under the time of 80ms -- the time it takes for the system() call to finish.
I can see when running a LTT session that the wake_up event occurs for the real time thread 10ms into the system call but nevertheless the real time kernel thread does not get scheduled.
The thread that calls system("run_my_script") is configured as SCHED_OTHER.
The Kernel is 2.6.21.
Anybody who recognize this or similar situations?
Cheers // Matias
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