In a port of a driver from another operating system, I am looking for a
message queueing function that I can use when system interrupts are
disabled (as logMsg function in Vxworks allows). Is this the essence of
the Trace function or seek I another?
Thanks
Doug
“Douglas Reed” <dreed@guise.com> wrote in message
news:3C5AFF78.E45DCFCE@guise.com…
In a port of a driver from another operating system, I am looking for a
message queueing function that I can use when system interrupts are
disabled (as logMsg function in Vxworks allows). Is this the essence of
the Trace function or seek I another?
Yes Trace will always works.
However I wonder if they reenable interrupt like all kernal calls do?
Thanks
Doug
Mario Charest <goto@nothingness.com> wrote:
“Douglas Reed” <> dreed@guise.com> > wrote in message
news:> 3C5AFF78.E45DCFCE@guise.com> …
In a port of a driver from another operating system, I am looking for a
message queueing function that I can use when system interrupts are
disabled (as logMsg function in Vxworks allows). Is this the essence of
the Trace function or seek I another?Yes Trace will always works.
However I wonder if they reenable interrupt like all kernal calls do?
No, they don’t.
I did a little test program:
(Headers removed, done as two seperate C files.)
pid_t far handler( void )
{
counter++;
return 0;
}
int counter;
main()
{
int intid;
int val1, val2;
int i;
intid = qnx_hint_attach( 0, handler, my_ds() );
printf(“about to disable interrupts\n”);
sleep(1);
/* disable interrupts /
_disable();
val1 = counter; / snap counter value */
Trace1( _TRACE_TEMPORARY|1, _TRACE_TRANSIENT,val1 );
for ( i = 0; i < 1000000000; i++ );
val2 = counter;
_enable();
printf(“interrupts enabled\n”);
printf(“val1:%d, val2:%d\n”, val1, val2 );
qnx_hint_detach( intid );
}
The output was:
about to disable interrupts
interrupts enabled
val1:101, val2:101
The trace buffer had:
Feb 06 10:24:22 2 fffff001 00000065
(6*16+5 = 101)
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