Is Overlapped I/O Supported? For Example, Can Multiple Threads Access the Serial Port?
Windows CE does not support the Win32® Overlapped I/O functions but our Serial driver is written to allow multiple threads to access the serial port at once (that is, a thread can be blocked on a ReadFile() call while another thread calls WriteFile()). The sample serial port also supports multiple opens (either from the same process or multiple processes), only one open can be Read/Write, the others must be Read Only. An OEM has the choice of restricting multiple threads or open calls.
