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Alex Rivera
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I am trying to create a shared memory which will be used by multiple processes. these processes communicate with each other using MPI calls ( MPI_Send , MPI_Recv ). I need a mechanism to control the access of this shared memory I added a question yesterday to see if MPI provides any facility to do that. Shared memory access control mechanism for processes created by MPI , but it seems that there is no such provision by MPI. So I have to choose between named semaphore or flock . For named semaphore if any of the process dies abruptly without calling sem_cloe() , than that semaphore always remains and can be seen by ll /dev/shm/ . This results in deadlock sometimes(if I run the same code again!), for this reason I am currently thinking of using flock. Just wanted to confirm if flock is best suited for this type of operation ? Are there any disadvantages of using flock ? Is there anything else apart from named semaphore and flock that can be used here ? I am working on C under linux.
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