#2369: [PowerPC Book E] Invalid mftb instruction in _CPU_Counter_read()
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Reporter: nick.withers | Owner: Nick Withers <nick.withers@…>
Type: defect | Status: closed
Priority: normal | Milestone: 4.11.1
Component: General | Version: 4.11
Severity: normal | Resolution: fixed
Keywords: |
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Comment (by sebastian.huber):
Replying to [comment:16 nick.withers]:
> Replying to [comment:15 sebastian.huber]:
> > Replying to [comment:14 nick.withers]:
> > > Replying to [comment:12 sebastian.huber]:
[...]
> > The use case for the _CPU_Counter_read() is to measure short time
intervals for the SMP lock profiling and short delay loops for device
drivers. Do you really want to busy wait for 123 seconds?
>
> Do you really want to busy wait 123 seconds instead of the intended
short time interval because you lost the race and the lower 32 bits of the
counter wrapped?
The rtems_counter_delay_ticks() doesn't have this problem. I just may not
account for the interrupted time if this time is in the range of one time
base period.
--
Ticket URL: <http://devel.rtems.org/ticket/2369#comment:17>
RTEMS Project <http://www.rtems.org/>
RTEMS Project
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