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--Copyright: Matra Datavision 1992,1993
-- File: OSD_Chronometer.cdl
-- Created: Tue 18 1992
-- Author: Stephan GARNAUD (ARM)
-- <sga@sparc4>
-- Updated: J.P. TIRAULT August 1993
-- All methods are static methods.
-- the "Show" method returns the consumed CPU time in a Real
-- variable.
-- J.P. TIRAULT October 15 1994
-- We measure both user and system cpu time.
--
class Chronometer from OSD
---Purpose: This class measures CPU time (both user and system) consumed
-- by current process or thread. The chronometer can be started
-- and stopped multiple times, and measures cumulative time.
--
-- If only the thread is measured, calls to Stop() and Show()
-- must occur from the same thread where Start() was called
-- (unless chronometer is stopped); otherwise measurement will
-- yield false values.
is
Create (ThisThreadOnly: Boolean = Standard_False) returns Chronometer from OSD;
---Purpose: Initializes a stopped Chronometer.
--
-- If ThisThreadOnly is True, measured CPU time will account
-- time of the current thread only; otherwise CPU of the
-- process (all threads, and completed children) is measured.
--
---Level: Public
Destroy ( me : out ) is virtual;
---C++: alias ~
Reset (me : in out) is virtual;
---Purpose: Stops and Reinitializes the Chronometer.
---Level: Public
Stop (me : in out) is virtual;
---Purpose: Stops the Chronometer.
---Level: Public
Start (me : in out) is virtual;
---Purpose: Starts (after Create or Reset) or restarts (after Stop)
-- the chronometer.
---Level: Public
Show (me : in out) is virtual;
---Purpose: Shows the current CPU user and system time on the
-- standard output stream <cout>.
-- The chronometer can be running (laps Time) or stopped.
---Level: Public
Show (me : in out; os : in out OStream from Standard) is virtual;
---Purpose: Shows the current CPU user and system time on the output
-- stream <os>.
-- The chronometer can be running (laps Time) or stopped.
---Level: Public
Show (me : in out; UserSeconds : in out Real from Standard) ;
---Purpose: Returns the current CPU user time in a variable.
-- The chronometer can be running (laps Time) or stopped.
---Level: Public
Show (me : in out; UserSeconds : in out Real from Standard;
SystemSeconds : in out Real from Standard) ;
---Purpose: Returns the current CPU user and system time in variables.
-- The chronometer can be running (laps Time) or stopped.
---Level: Public
GetProcessCPU (myclass; UserSeconds : out Real from Standard;
SystemSeconds : out Real from Standard);
---Purpose: Returns CPU time (user and system) consumed by the current
-- process since its start, in seconds. The actual precision of
-- the measurement depends on granularity provided by the system,
-- and is platform-specific.
---Level: Public
GetThreadCPU (myclass; UserSeconds : out Real from Standard;
SystemSeconds : out Real from Standard);
---Purpose: Returns CPU time (user and system) consumed by the current
-- thread since its start. Note that this measurement is
-- platform-specific, as threads are implemented and managed
-- differently on different platforms and CPUs.
---Level: Advanced
fields
Stopped : Boolean is protected;
ThreadOnly : Boolean;
Start_user : Real;
Start_sys : Real;
Cumul_user : Real;
Cumul_sys : Real;
end;
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