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3.2.2 Processing Procedures for Service Calls from Handlers

When a service call is issued from a handler, task switching does not occur unlike in the case of a service call from a task.

However, task switching occurs when a return from a handler

is made.

The processing procedures for service calls from handlers are roughly classified into the following three types.

1. A service call from a handler that caused an interrupt during task execution

2. A service call from a handler that caused an interrupt during service call processing

3. A service call from a handler that caused an interrupt (multiplex interrupt) during handler exe-

cution

The service call can't be issued from non-kernel handler. Therefore, The handler described here does not include the non-kernel interrupt

handler.

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