Safe Haskell	Safe-Inferred
Language	Haskell2010

System.Clock.Seconds

Synopsis

data Clock
- = Monotonic
- | Realtime
- | ProcessCPUTime
- | ThreadCPUTime
- | MonotonicRaw
- | Boottime
- | MonotonicCoarse
- | RealtimeCoarse
newtype Seconds = Seconds {
- toTimeSpec :: TimeSpec
}
getTime :: Clock -> IO Seconds
getRes :: Clock -> IO Seconds
fromNanoSecs :: Integer -> Seconds
toNanoSecs :: Seconds -> Integer
diffTimeSpec :: Seconds -> Seconds -> Seconds

Documentation

data Clock Source #

Clock types. A clock may be system-wide (that is, visible to all processes) or per-process (measuring time that is meaningful only within a process). All implementations shall support Realtime.

Constructors

Monotonic	The identifier for the system-wide monotonic clock, which is defined as a clock measuring real time, whose value cannot be set via `clock_settime` and which cannot have negative clock jumps. The maximum possible clock jump shall be implementation defined. For this clock, the value returned by `getTime` represents the amount of time (in seconds and nanoseconds) since an unspecified point in the past (for example, system start-up time, or the Epoch). This point does not change after system start-up time. Note that the absolute value of the monotonic clock is meaningless (because its origin is arbitrary), and thus there is no need to set it. Furthermore, realtime applications can rely on the fact that the value of this clock is never set. (Identical to `Boottime` since Linux 4.17, see https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=d6ed449afdb38f89a7b38ec50e367559e1b8f71f) `CLOCK_MONOTONIC` (macOS - `SYSTEM_CLOCK`)
Realtime	The identifier of the system-wide clock measuring real time. For this clock, the value returned by `getTime` represents the amount of time (in seconds and nanoseconds) since the Epoch. `CLOCK_REALTIME` (macOS - `CALENDAR_CLOCK`, Windows - `GetSystemTimeAsFileTime`)
ProcessCPUTime	The identifier of the CPU-time clock associated with the calling process. For this clock, the value returned by `getTime` represents the amount of execution time of the current process.
ThreadCPUTime	The identifier of the CPU-time clock associated with the calling OS thread. For this clock, the value returned by `getTime` represents the amount of execution time of the current OS thread.
MonotonicRaw	(since Linux 2.6.28, macOS 10.12) Similar to `Monotonic`, but provides access to a raw hardware-based time that is not subject to NTP adjustments or the incremental adjustments performed by adjtime(3). `CLOCK_MONOTONIC_RAW` (Windows - `QueryPerformanceCounter`, `QueryPerformanceFrequency`)
Boottime	(since Linux 2.6.39; Linux-specific) Identical to `Monotonic`, except it also includes any time that the system is suspended. This allows applications to get a suspend-aware monotonic clock without having to deal with the complications of `Realtime`, which may have discontinuities if the time is changed using settimeofday(2). (since Linux 4.17; identical to `Monotonic`) `CLOCK_BOOTTIME`
MonotonicCoarse	(since Linux 2.6.32; Linux-specific) A faster but less precise version of `Monotonic`. Use when you need very fast, but not fine-grained timestamps. `CLOCK_MONOTONIC_COARSE`
RealtimeCoarse	(since Linux 2.6.32; Linux-specific) A faster but less precise version of `Realtime`. Use when you need very fast, but not fine-grained timestamps. `CLOCK_REALTIME_COARSE`

Instances

Instances details

Enum Clock Source #
Instance details Defined in System.Clock Methods succ :: Clock -> Clock # pred :: Clock -> Clock # toEnum :: Int -> Clock # fromEnum :: Clock -> Int # enumFrom :: Clock -> [Clock] # enumFromThen :: Clock -> Clock -> [Clock] # enumFromTo :: Clock -> Clock -> [Clock] # enumFromThenTo :: Clock -> Clock -> Clock -> [Clock] #
Generic Clock Source #
Instance details Defined in System.Clock Associated Types type Rep Clock :: Type -> Type # Methods from :: Clock -> Rep Clock x # to :: Rep Clock x -> Clock #
Read Clock Source #
Instance details Defined in System.Clock Methods readsPrec :: Int -> ReadS Clock # readList :: ReadS [Clock] # readPrec :: ReadPrec Clock # readListPrec :: ReadPrec [Clock] #
Show Clock Source #
Instance details Defined in System.Clock Methods showsPrec :: Int -> Clock -> ShowS # show :: Clock -> String # showList :: [Clock] -> ShowS #
Eq Clock Source #
Instance details Defined in System.Clock Methods (==) :: Clock -> Clock -> Bool # (/=) :: Clock -> Clock -> Bool #
type Rep Clock Source #
Instance details Defined in System.Clock type Rep Clock = D1 ('MetaData "Clock" "System.Clock" "clock-0.8.4-3296s51dIjRIlLWyVuI7gw" 'False) (((C1 ('MetaCons "Monotonic" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Realtime" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "ProcessCPUTime" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "ThreadCPUTime" 'PrefixI 'False) (U1 :: Type -> Type))) :+: ((C1 ('MetaCons "MonotonicRaw" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "Boottime" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "MonotonicCoarse" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RealtimeCoarse" 'PrefixI 'False) (U1 :: Type -> Type))))

newtype Seconds Source #

Constructors

Seconds
Fields toTimeSpec :: TimeSpec

Instances

Instances details

Storable Seconds Source #
Instance details Defined in System.Clock.Seconds Methods sizeOf :: Seconds -> Int # alignment :: Seconds -> Int # peekElemOff :: Ptr Seconds -> Int -> IO Seconds # pokeElemOff :: Ptr Seconds -> Int -> Seconds -> IO () # peekByteOff :: Ptr b -> Int -> IO Seconds # pokeByteOff :: Ptr b -> Int -> Seconds -> IO () # peek :: Ptr Seconds -> IO Seconds # poke :: Ptr Seconds -> Seconds -> IO () #
Bounded Seconds Source #
Instance details Defined in System.Clock.Seconds Methods minBound :: Seconds # maxBound :: Seconds #
Enum Seconds Source #
Instance details Defined in System.Clock.Seconds Methods succ :: Seconds -> Seconds # pred :: Seconds -> Seconds # toEnum :: Int -> Seconds # fromEnum :: Seconds -> Int # enumFrom :: Seconds -> [Seconds] # enumFromThen :: Seconds -> Seconds -> [Seconds] # enumFromTo :: Seconds -> Seconds -> [Seconds] # enumFromThenTo :: Seconds -> Seconds -> Seconds -> [Seconds] #
Generic Seconds Source #
Instance details Defined in System.Clock.Seconds Associated Types type Rep Seconds :: Type -> Type # Methods from :: Seconds -> Rep Seconds x # to :: Rep Seconds x -> Seconds #
Num Seconds Source #
Instance details Defined in System.Clock.Seconds Methods (+) :: Seconds -> Seconds -> Seconds # (-) :: Seconds -> Seconds -> Seconds # (*) :: Seconds -> Seconds -> Seconds # negate :: Seconds -> Seconds # abs :: Seconds -> Seconds # signum :: Seconds -> Seconds # fromInteger :: Integer -> Seconds #
Read Seconds Source #
Instance details Defined in System.Clock.Seconds Methods readsPrec :: Int -> ReadS Seconds # readList :: ReadS [Seconds] # readPrec :: ReadPrec Seconds # readListPrec :: ReadPrec [Seconds] #
Fractional Seconds Source #
Instance details Defined in System.Clock.Seconds Methods (/) :: Seconds -> Seconds -> Seconds # recip :: Seconds -> Seconds # fromRational :: Rational -> Seconds #
Real Seconds Source #
Instance details Defined in System.Clock.Seconds Methods toRational :: Seconds -> Rational #
RealFrac Seconds Source #
Instance details Defined in System.Clock.Seconds Methods properFraction :: Integral b => Seconds -> (b, Seconds) # truncate :: Integral b => Seconds -> b # round :: Integral b => Seconds -> b # ceiling :: Integral b => Seconds -> b # floor :: Integral b => Seconds -> b #
Show Seconds Source #
Instance details Defined in System.Clock.Seconds Methods showsPrec :: Int -> Seconds -> ShowS # show :: Seconds -> String # showList :: [Seconds] -> ShowS #
Eq Seconds Source #
Instance details Defined in System.Clock.Seconds Methods (==) :: Seconds -> Seconds -> Bool # (/=) :: Seconds -> Seconds -> Bool #
Ord Seconds Source #
Instance details Defined in System.Clock.Seconds Methods compare :: Seconds -> Seconds -> Ordering # (<) :: Seconds -> Seconds -> Bool # (<=) :: Seconds -> Seconds -> Bool # (>) :: Seconds -> Seconds -> Bool # (>=) :: Seconds -> Seconds -> Bool # max :: Seconds -> Seconds -> Seconds # min :: Seconds -> Seconds -> Seconds #
type Rep Seconds Source #
Instance details Defined in System.Clock.Seconds type Rep Seconds = D1 ('MetaData "Seconds" "System.Clock.Seconds" "clock-0.8.4-3296s51dIjRIlLWyVuI7gw" 'True) (C1 ('MetaCons "Seconds" 'PrefixI 'True) (S1 ('MetaSel ('Just "toTimeSpec") 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 TimeSpec)))

getTime :: Clock -> IO Seconds Source #

The getTime function shall return the current value for the specified clock.

getRes :: Clock -> IO Seconds Source #

The getRes function shall return the resolution of any clock. Clock resolutions are implementation-defined and cannot be set by a process.

fromNanoSecs :: Integer -> Seconds Source #

Seconds from nano seconds.

toNanoSecs :: Seconds -> Integer Source #

Seconds to nano seconds.

diffTimeSpec :: Seconds -> Seconds -> Seconds Source #

Compute the absolute difference.