Struct otter_api_tests::crates::otter_support::crates::nix::sys::timerfd::TimerFd
[−]pub struct TimerFd { /* private fields */ }
Expand description
A timerfd instance. This is also a file descriptor, you can feed it to other interfaces consuming file descriptors, epoll for example.
Implementations
impl TimerFd
impl TimerFd
pub fn new(clockid: ClockId, flags: TimerFlags) -> Result<TimerFd, Errno>
pub fn new(clockid: ClockId, flags: TimerFlags) -> Result<TimerFd, Errno>
Creates a new timer based on the clock defined by clockid
. The
underlying fd can be assigned specific flags with flags
(CLOEXEC,
NONBLOCK). The underlying fd will be closed on drop.
pub fn set(
&self,
expiration: Expiration,
flags: TimerSetTimeFlags
) -> Result<(), Errno>
pub fn set(
&self,
expiration: Expiration,
flags: TimerSetTimeFlags
) -> Result<(), Errno>
Sets a new alarm on the timer.
Types of alarm
There are 3 types of alarms you can set:
-
one shot: the alarm will trigger once after the specified amount of time. Example: I want an alarm to go off in 60s and then disable itself.
-
interval: the alarm will trigger every specified interval of time. Example: I want an alarm to go off every 60s. The alarm will first go off 60s after I set it and every 60s after that. The alarm will not disable itself.
-
interval delayed: the alarm will trigger after a certain amount of time and then trigger at a specified interval. Example: I want an alarm to go off every 60s but only start in 1h. The alarm will first trigger 1h after I set it and then every 60s after that. The alarm will not disable itself.
Relative vs absolute alarm
If you do not set any TimerSetTimeFlags
, then the TimeSpec
you pass
to the Expiration
you want is relative. If however you want an alarm
to go off at a certain point in time, you can set TFD_TIMER_ABSTIME
.
Then the one shot TimeSpec and the delay TimeSpec of the delayed
interval are going to be interpreted as absolute.
Disabling alarms
Note: Only one alarm can be set for any given timer. Setting a new alarm actually removes the previous one.
Note: Setting a one shot alarm with a 0s TimeSpec disables the alarm altogether.
pub fn get(&self) -> Result<Option<Expiration>, Errno>
pub fn get(&self) -> Result<Option<Expiration>, Errno>
Get the parameters for the alarm currently set, if any.
Trait Implementations
Auto Trait Implementations
impl RefUnwindSafe for TimerFd
impl Send for TimerFd
impl Sync for TimerFd
impl Unpin for TimerFd
impl UnwindSafe for TimerFd
Blanket Implementations
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