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Service Calls from a Handler That Caused an Interrupt during Task Execution 
Scheduling (task switching) is initiated by the ret_int service call

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(See Figure 3.11). 

 

 

Scheduler 

Interrupt 

ret_int 

iset_flg 

TaskA 

Interrupt handler 

Save Registers 

Service call processing 

OS 

Restore Registers

SP <= User 

Restore Registers 

Task selection 

TaskB 

 

                                                      

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  The ret_int service call is issued automatically when kernel interrupt handler is written in C language (when #pragma INTHANDLER speci-

fied)