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The sources of the Free Pascal compiler, RTL, packages and utilities.
See https://www.freepascal.org/ for more info.
e9c5458dd2
* Fix for InterLockedCompareExchange on ARMEL InterLockedCompareExchange would not return the current data on failure. Getting this to work correctly is a bit tricky. As kuser_cmpxchg does not return the set value, we have to load it. There is a tiny chance that we get rescheduled between calling kuser_cmpxchg and loading the value. If the value changed in between there is the possibility that we would return the Comperand without having done an actual swap. Which might cause havoc and destruction. So, if the exchange failed, compare the value and loop again in case of CurrentValue == Comperand. * Improve testing of InterLockedCompareExchange Added a test to check for the case when Comperand is different from the current value. git-svn-id: trunk@20514 - |
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