Copyright | (c) 2019 Composewell Technologies (c) 2009-2012 Cetin Sert (c) 2010 Eugene Kirpichov |
---|---|
License | BSD3 |
Maintainer | streamly@composewell.com |
Stability | experimental |
Portability | GHC |
Safe Haskell | None |
Language | Haskell2010 |
get time from the system clock
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 CLOCK_REALTIME. (The only suspend-aware monotonic is CLOCK_BOOTTIME on Linux.)
Monotonic | The identifier for the system-wide monotonic clock, which is defined as
a clock measuring real time, whose value cannot be set via
|
Realtime | The identifier of the system-wide clock measuring real time. For this
clock, the value returned by |
ProcessCPUTime | The identifier of the CPU-time clock associated with the calling
process. For this clock, the value returned by |
ThreadCPUTime | The identifier of the CPU-time clock associated with the calling OS
thread. For this clock, the value returned by |
MonotonicRaw | (since Linux 2.6.28; Linux and Mac OSX) Similar to CLOCK_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). |
MonotonicCoarse | (since Linux 2.6.32; Linux and Mac OSX) A faster but less precise version of CLOCK_MONOTONIC. Use when you need very fast, but not fine-grained timestamps. |
Uptime | (since Linux 2.6.39; Linux and Mac OSX) Identical to CLOCK_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 CLOCK_REALTIME, which may have discontinuities if the time is changed using settimeofday(2). |
RealtimeCoarse | (since Linux 2.6.32; Linux-specific) A faster but less precise version of CLOCK_REALTIME. Use when you need very fast, but not fine-grained timestamps. |
Instances
Enum Clock Source # | |
Defined in Streamly.Internal.Data.Time.Clock.Type | |
Eq Clock Source # | |
Read Clock Source # | |
Show Clock Source # | |
Generic Clock Source # | |
type Rep Clock Source # | |
Defined in Streamly.Internal.Data.Time.Clock.Type type Rep Clock = D1 ('MetaData "Clock" "Streamly.Internal.Data.Time.Clock.Type" "streamly-core-0.1.0-inplace" '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 "MonotonicCoarse" 'PrefixI 'False) (U1 :: Type -> Type)) :+: (C1 ('MetaCons "Uptime" 'PrefixI 'False) (U1 :: Type -> Type) :+: C1 ('MetaCons "RealtimeCoarse" 'PrefixI 'False) (U1 :: Type -> Type)))) |