# Module System

Inheritance graph

Description

  This module embodies common operating system calls, making them available to the Pike programmer.

Constant CPU_TIME_IMPLEMENTATION

  ``constant` `string` System.`CPU_TIME_IMPLEMENTATION``

Description

  This string constant identifies the internal interface used to get the CPU time. It is an implementation detail - see rusage.c for possible values and their meanings.

See also

  gethrvtime, `gauge`

Constant CPU_TIME_IS_THREAD_LOCAL

  ``constant` `string` System.`CPU_TIME_IS_THREAD_LOCAL``

Description

  This string constant tells whether or not the CPU time, returned by e.g. gethrvtime, is thread local or not. The value is "yes" if it is and "no" if it isn't. The value is also "no" if there is no thread support.

See also

  gethrvtime, `gauge`

Constant CPU_TIME_RESOLUTION

  ``constant` `int` System.`CPU_TIME_RESOLUTION``

Description

  The resolution of the CPU time, returned by e.g. gethrvtime, in nanoseconds. It is `-1` if the resolution isn't known.

See also

  gethrvtime, `gauge`

Constant ITIMER_PROF

  ``constant` System.`ITIMER_PROF``

Description

  Identifier for a timer that decrements both when the process is executing and when the system is executing on behalf of the process.

See also

  setitimer, getitimer

Constant ITIMER_REAL

  ``constant` System.`ITIMER_REAL``

Description

  Identifier for a timer that decrements in real time.

See also

  setitimer, getitimer

Constant ITIMER_VIRTUAL

  ``constant` System.`ITIMER_VIRTUAL``

Description

  Identifier for a timer that decrements only when the process is executing.

See also

  setitimer, getitimer

Constant REAL_TIME_IMPLEMENTATION

  ``constant` `string` System.`REAL_TIME_IMPLEMENTATION``

Description

  This string constant identifies the internal interface used to get the high resolution real time. It is an implementation detail - see rusage.c for possible values and their meanings.

See also

  gethrtime

Constant REAL_TIME_IS_MONOTONIC

  ``constant` `string` System.`REAL_TIME_IS_MONOTONIC``

Description

  This string constant tells whether or not the high resolution real time returned by gethrtime, is monotonic or not. The value is "yes" if it is and "no" if it isn't.

  Monotonic time is not affected by clock adjustments that might happen to keep the calendaric clock in synch. It's therefore more suited to measure time intervals in programs.

See also

  gethrtime

Constant REAL_TIME_RESOLUTION

  ``constant` `int` System.`REAL_TIME_RESOLUTION``

Description

  The resolution of the real time returned by gethrtime, in nanoseconds. It is `-1` if the resolution isn't known.

See also

  gethrtime

Inherit _system

  `inherit `_system` : _system`