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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 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. 
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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).

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