Daan De Meyer
cf4c65afa8
Add a family of sd_fiber_*() I/O wrappers that, when called from a
fiber, behave like blocking I/O from the caller's perspective but
yield to the event loop instead of blocking the thread:
sd_fiber_read / sd_fiber_write
sd_fiber_readv / sd_fiber_writev
sd_fiber_recv / sd_fiber_send
sd_fiber_connect
sd_fiber_recvmsg / sd_fiber_sendmsg
sd_fiber_recvfrom / sd_fiber_sendto
sd_fiber_accept
sd_fiber_ppoll
Most of them share a single helper, fiber_io_operation(), which when
invoked outside a fiber falls through to the underlying syscall
directly, preserving the regular blocking behaviour. Inside a fiber
the helper flips the fd to non-blocking (restoring its original mode
on return), tries the syscall once on the fast path, and on EAGAIN/
EWOULDBLOCK creates an sd-event-backed IO future via future_new_io(),
suspends the fiber, and retries the syscall once the event source
fires.
future_new_io() itself is added to sd-event/event-future.{c,h} as a
new IoFuture kind. It wraps sd_event_add_io() into an sd_future:
oneshot enable, EPOLLERR translated via SO_ERROR (suppressed for
non-sockets), and the fd duplicated with F_DUPFD_CLOEXEC to avoid
EEXIST when multiple sources watch the same descriptor.
Together these let fiber-using code write straight-line socket and
pipe I/O without bundling state into callbacks.
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