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Service Calls from a Handler That Caused an Interrupt during Handler Execution

Let u

s think of a situation in which an interrupt occurs during handler execution (this handler is hereinafter referred to as

handler A for explanation purposes). When task switching is called for as a handler (hereinafter referred to as handler B)

that caused an interrupt during handler A execution issued a service call, task switching does not take place during the exe-

cution of the service call (ret_int service call) returned from handler B, but is effected by the ret_int service call from han-

dler A (See Figure 3.13).

ret_int

iset_flg

nterrupt

Interrupt

TaskA

Interrupt handler A

Save Registers

Service call processing

Restore Register

SP <= User

Restore Registers

Task selection

TaskB

Save Registers

SP <= System

Interrupt handler A

Restore Register

Figure 3.13 Processing Procedure for a service call from a Multiplex interrupt Handler

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 303 304

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