Feature #16597 » 0012-Update-extension.rdoc-for-rb_fd_select.patch
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Returns true if a given FD is set in the rb_fdset_t, false if not.
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Analogous to FD_ISSET(3).
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int rb_thread_fd_select(int nfds, rb_fdset_t *readfds, rb_fdset_t *writefds, rb_fdset_t *exceptfds, struct timeval *timeout) ::
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int rb_thread_fd_select(int nfds, rb_fdset_t *readfds, rb_fdset_t *writefds, rb_fdset_t *exceptfds, rb_fdset_t *errorfds, struct timeval *timeout, _Bool select_iface) ::
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Analogous to the select(2) system call, but allows other Ruby
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threads to be scheduled while waiting.
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When USE_POLL is non-zero errorfds can be used to pass in set of file
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descriptors to poll for errors, and select_iface can be set to false to
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return descriptor error as bit in the array rather than an exception.
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When only waiting on a single FD, favor rb_io_wait_readable,
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rb_io_wait_writable, or rb_wait_for_single_fd functions since
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they can be optimized for specific platforms (currently, only Linux).
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