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authorcheloha <cheloha@openbsd.org>2020-08-09 19:15:47 +0000
committercheloha <cheloha@openbsd.org>2020-08-09 19:15:47 +0000
commit3c86a58ec71566e00b1985a59e38d0e8890ad3b4 (patch)
tree67abc7483e75b30c22fb0b3a770c962375a20fd9 /gnu/llvm/compiler-rt/lib/sanitizer_common/scripts/cpplint.py
parentFix some wrapping/indent. (diff)
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hardclock(9): fix race with setitimer(2) for ITIMER_VIRTUAL, ITIMER_PROF
The ITIMER_VIRTUAL and ITIMER_PROF per-process interval timers are updated from hardclock(9). If a timer for the parent process is enabled the hardclock(9) thread calls itimerdecr() to update and reload it as needed. However, in itimerdecr(), after entering itimer_mtx, the thread needs to double-check that the timer in question is still enabled. While the hardclock(9) thread is entering itimer_mtx a thread in setitimer(2) can take the mutex and disable the timer. If the timer is disabled, itimerdecr() should return 1 to indicate that the timer has not expired and that no action needs to be taken. ok kettenis@
Diffstat (limited to 'gnu/llvm/compiler-rt/lib/sanitizer_common/scripts/cpplint.py')
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