pub fn eventfd(initval: u64, flags: EventFlags) -> Result<i32>Expand description
Wait for some event on a file descriptor.
eventfd creates an linux-like “eventfd object” that can be used
as an event wait/notify mechanism by user-space applications, and by
the kernel to notify user-space applications of events. The
object contains an unsigned 64-bit integer counter
that is maintained by the kernel. This counter is initialized
with the value specified in the argument initval.
As its return value, eventfd returns a new file descriptor that
can be used to refer to the eventfd object.
The following values may be bitwise set in flags to change the
behavior of eventfd:
EFD_NONBLOCK: Set the file descriptor in non-blocking mode
EFD_SEMAPHORE: Provide semaphore-like semantics for reads
from the new file descriptor.