running 2 cross dependancy tests:

hello, i'd like to make an inout file interface between 2 dut's that feeding each other with data (to imitate the operation of socket). therefore, each dut test process reads data from one file and writes data to another, whereas the other dut, does the same only with opposite files. my question is whether specman can deal reading and writing to/from the same file on the same time without causing deadlock. should i use some sort of mutex to avoid the situation when one dut test process open a file for reading, but there's nothing to read, while the other process cannot write data to this file since it's already opened for reading by another process. perhaps you have a better solution without using files ? thanks, Zohar