D.14.3 Execution Time of Interrupt Handlers
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This subclause describes a language-defined package to measure the execution
time of interrupt handlers.
Static Semantics
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The following language-defined library package exists:
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with Ada.Interrupts;
package Ada.Execution_Time.Interrupts
with Nonblocking, Global =>
in out synchronized is
function Clock (Interrupt : Ada.Interrupts.Interrupt_Id)
return CPU_Time;
function Supported (Interrupt : Ada.Interrupts.Interrupt_Id)
return Boolean;
end Ada.Execution_Time.Interrupts;
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The execution time or CPU time of a given interrupt Interrupt is defined
as the time spent by the system executing interrupt handlers identified
by Interrupt, including the time spent executing run-time or system services
on its behalf. The mechanism used to measure execution time is implementation
defined. Time spent executing interrupt handlers is distinct from time
spent executing any task.
Discussion: The implementation-defined
mechanism here is the same as that covered by the Documentation Requirements
of
D.14, so we don't repeat that requirement
here.
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For each interrupt, the execution time value is initially set to zero.
Dynamic Semantics
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The function Clock returns the current cumulative execution time of the
interrupt identified by Interrupt. If Separate_Interrupt_Clocks_Supported
is set to False the function raises Program_Error.
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The function Supported returns True if the implementation is monitoring
the execution time of the interrupt identified by Interrupt; otherwise,
it returns False. For any Interrupt_Id Interrupt for which Supported(Interrupt)
returns False, the function Clock(Interrupt) will return a value equal
to Ada.Execution_Time.Time_Of(0).
Extensions to Ada 2005
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The package Execution_Time.Interrupts is new.
Ada 2005 and 2012 Editions sponsored in part by Ada-Europe
