TAILIEUCHUNG - Concurrent Programming

Concurrent Programming introducing some principles of reentrancy, mutual exclusion and thread synchronization: Problems with ‘’, One cure is communication, Kernel semaphores, Mutual-exclusion syntax, struct file_operations. | Concurrent Programming Introducing some principles of reentrancy, mutual exclusion and thread-synchronization Problems with ‘’ • We wrote a ‘public clipboard’ device-driver in order to illustrate ‘sleeping’ and ‘waking’ • But our initial version of that driver module exhibits some problems – for example, if we allow more one process to read from our ‘/dev/stash’ device-file concurrently: Reader in window #1: $ cat /dev/stash Reader in window #2: $ cat /dev/stash Writer in window #3: $ ls /usr/bin > /dev/stash What is a ‘race condition’ ? • Without any ‘synchronization’ mechanism, multiprogramming is vulnerable to ‘races’ in which programs produce unpredictable and erroneous results, due to the relative timing of instruction-execution in separate threads or processes • An example program demonstrates this phenomenon (see our ‘’) One cure is communication • What’s needed is some way for the tasks to be made aware of each other’s actions, or for a separate ‘supervisor’ program (the operating system -- or one of its installed kernel modules) with power to intervene, and thus to impose some synchronization • Various mechanisms exist in Linux which make it possible for tasks to communicate or for the kernel (and drivers) to mediate Kernel semaphores • The ‘race conditions’ that are exhibited by our ‘’ device-driver when we use it with two or more ‘reader’ processes -- or with two or more ‘writer’ processes -- can be eliminated by enabling our driver to enforce a ‘one-writer/one-reader’ policy • This is easy to do by using .

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