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authorVinson Lee <vlee@vmware.com>2010-04-26 00:25:30 -0700
committerVinson Lee <vlee@vmware.com>2010-04-26 00:31:20 -0700
commit31db310be489e1fc83fa3f72366e2e5fdd2a00e7 (patch)
tree341a6a27e0fe59f81397a2256abbea4f8af58fb8 /SConstruct
parent59fcbc0ac5458c14ae2ec783df8736f3e2fe0963 (diff)
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os: Check for spurious wakeups in pipe_barrier_wait.
The POSIX function pthread_cond_wait can have spurious wakeups when waiting on a condition variable. Add a 64-bit counter that is incremented whenever the barrier becomes full. A woken thread checks the counter. If the counter has not changed then it has been spuriously woken and goes back to sleep. If the counter has changed then it was properly signaled and exits the barrier. Tested on Mac OS X. This patch was based on ideas from Luca Barbieri.
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