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Chapter 7 Application Creation Guide 
   
- 137 - 
7.1.1 
System Calls from a Handler That Caused an Interrupt during Task Execution 
Scheduling (task switching) is initiated by the ret_int service call
 
Scheduler
Interrupt
ret_int
iset_flg
TaskA
Interrupt handler
Save Registers
system call processing
OS
Restore Registers
SP <= User
Restore Registers
Task selection
TaskB
 
Figure 7.1 Processing Procedure for a System Call a Handler that caused an interrupt during Task 
Execution 
                                                      
63
  The ret_int service call is issued automatically when OS-dependent handler is written in C language (when #pragma INTHANDLER 
specified)