Brandon> I'm trying to find out if there is a pollable semaphore
Brandon> equivalent on Linux. The main idea of a "pollable
Brandon> semaphore", is a semaphore with a related file
Brandon> descriptor. The file descriptor can be used to select()
Brandon> when the semaphore is acquirable. This provides a
Brandon> convenient way for users to implement code
Brandon> synchronization between threads, where multiple file
Brandon> descriptors are already being selected against.
Yes, I believe futexes and specifically FUTEX_FD can be used to
implement this. See http://people.redhat.com/~drepper/futex.pdf for
full details.
- Roland
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