Added watchdog module. #232
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dpino
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Feb 9, 2016
Flush JIT when reloading binding table.
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This adds the module
lib.watchdog.watchdogwhose purpose is to provide a simple process supervision service. The idea is to set up a "watchdog" with a specified timeout. Unless the timeout is reset in time, the watchdog will kill the process because it is assumed that the offending process is hanging.The implementation works as follows (roughly speaking): The process periodically resets an
alarm(3), resetting the previous alarm each time. If it fails to reset the alarm, it will receive aSIGALRMwhich it does not handle, and thus it is killed.For a detailed usage description see the file
src/watchdog/README.md.NOTE: This pull request also introduces a new way to write tests. It adjusts
src/Makefileto look for executables namedselftest.shin thesrc/directory and run them as tests.