File System Considerations (Windows CE 5.0)
Making file system calls from real-time threads can worsen real-time performance. The file system drivers that are released with Windows CE are not real time. Like GWES, the File System Manager and the supplied file system drivers use critical sections to protect critical data. The use of a single critical section per file system means that a lower-priority thread can block a higher-priority thread from running if the lower-priority thread has acquired the critical section before the higher-priority thread is ready to run.
See Also
Real-Time Performance Considerations
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