- 174 -
unl_cpu
Unlock the CPU
iunl_cpu
Unlock the CPU (handler only)
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ER ercd = unl_cpu();
ER ercd = iunl_cpu();
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ER ercd Terminated
normally (E_OK)
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.include mr100.inc
unl_cpu
iunl_cpu
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Register name
Content after service call is issued
R0 Error
code
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This service call frees the system from a CPU locked state that was set by the loc_cpu or iloc_cpu service call. If the
unl_cpu service call is issued from a dispatching enabled state, task scheduling is performed. If the system was put into a
CPU locked state by invoking iloc_cpu within an interrupt handler, the system must always be placed out of a CPU locked
state by invoking iunl_cpu before it returns from the interrupt handler.
The CPU locked state and the dispatching disabled state are managed independently of each other. Therefore, the system
cannot be freed from a dispatching disabled state by the unl_cpu or iunl_cpu service call unless the ena_dsp service call is
used.
If this service call is to be issued from task context, use unl_cpu; if issued from non-task context, use iunl_cpu.
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<<Example statement in C language>>
#include <itron.h>
#include <kernel.h>
#include “kernel_id.h”
void task()
{
:
unl_cpu();
:
}
<<Example statement in assembly language>>
.include
mr100.inc
.GLB
task
task:
:
unl_cpu
:
