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Hi, One of the RTEMS users was looking at fclose and is concerned about the possibility of multiple tasks attempting to close the same FILE simultaneously. In his scenario, task A blocks while doing the fflush() and task B begins to execute fclose() on the same FILE. If newlib's reentrancy features are in use (which they are in this case), will this be safe? If so, why? We see one of the tasks returning from fflush() first and freeing all the memory. The second task gets stale pointers and tries to free those buffers. We suppose that the worst case would be that the buffers get reallocated before the second task gets its shot at freeing them. Comments... --joel Joel Sherrill Director of Research & Development joel@OARcorp.com On-Line Applications Research Ask me about RTEMS: a free RTOS Huntsville AL 35805 Support Available (205) 722-9985