System.Posix.Timer

POSIX clocks and timers.

Clocks

newtype Clock

Mirrors clockid_t.

Constructors

Clock Int32

Instances

Eq Clock

Ord Clock

Show Clock

Storable Clock

monotonicClock :: Clock

realtimeClock :: Clock

processTimeClock :: Clock

threadTimeClock :: Clock

getProcClock :: ProcessID -> IO Clock

Get the CPU-time clock of the given process. See clock_getcpuclockid(3).

getClockResolution :: Clock -> IO TimeSpec

Get the clock resolution. See clock_getres(3).

getClockTime :: Clock -> IO TimeSpec

Get the clock time. See clock_gettime(3).

setClockTime :: Clock -> TimeSpec -> IO ()

Set the clock time. See clock_settime(3).

clockSleep :: Clock -> TimeSpec -> IO TimeSpec

Sleep for the specified duration. When interrupted by a signal, returns the amount of time left to sleep. See clock_nanosleep(3).

clockSleepAbs :: Clock -> TimeSpec -> IO ()

Sleep until the clock time reaches the specified value. See clock_nanosleep(3).

Timers

data TimeSpec

Mirrors struct timespec.

Instances

Bounded TimeSpec

Eq TimeSpec

Num TimeSpec

Ord TimeSpec

Show TimeSpec

Storable TimeSpec

timeSpecSeconds :: TimeSpec -> CTime

timeSpecNanoseconds :: TimeSpec -> CULong

mkTimeSpec :: CTime -> CULong -> TimeSpec

Create a TimeSpec from amounts of seconds and nanoseconds.

timeSpecV :: TimeSpec -> (CTime, CULong)

Convert a TimeSpec to a pair of its components. Useful as a view pattern.

data ITimerSpec

Mirrors struct itimerspec.

Constructors

ITimerSpec

Fields

iTimerSpecInterval :: !TimeSpec

iTimerSpecValue :: !TimeSpec

Instances

Eq ITimerSpec

Show ITimerSpec

Storable ITimerSpec

data Timer

Mirrors timer_t.

Instances

Eq Timer

Ord Timer

Show Timer

Storable Timer

createTimer

Arguments

:: Clock

-> Maybe (Signal, WordPtr)

Optional signal to raise on timer expirations and value of siginfo.si_value.

-> IO Timer

Create a timer. See timer_create(3).

configureTimer

Arguments

:: Timer

-> Bool

Whether the expiration time is absolute.

-> TimeSpec

Expiration time. Zero value disarms the timer.

-> TimeSpec

Interval between subsequent expirations.

-> IO (TimeSpec, TimeSpec)

Setup the timer. See timer_settime(3).

timerTimeLeft :: Timer -> IO (TimeSpec, TimeSpec)

Get the amount of time left until the next expiration and the interval between the subsequent expirations. See timer_gettime(3).

timerOverrunCnt :: Timer -> IO CInt

Get the timer overrun count. See timer_getoverrun(3).

destroyTimer :: Timer -> IO ()

Destroy the timer. See timer_delete(3).