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Editorial Team
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Asked: 2026-05-26T21:56:05+00:00

I’m building a multithreaded application with pthreads and need a thread to periodically check

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I’m building a multithreaded application with pthreads and need a thread to periodically check some stuff. During the time in between this thread shouldn’t use any CPU. Is this possible with usleep()? Is usleep() not busy waiting? Or is there a better solution?

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1 Answer

  1. Editorial Team

    The function usleep has been removed from SUSv4. You should probably use nanosleep instead or timers (setitimer, etc).

    As R.. notes in the comments, should the sleep be implemented as a busy wait:

    • The thread would continue to use the CPU
    • Other (lower-priority) threads wouldn’t get a chance to run

    Thus:

    • Some might use signals (I think SUSv3 mentioned SIGALARM?)
    • Some might use fancy timers
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