Fork of glibc for development https://git.zx2c4.com/glibc/atom/benchtests/pthread_once-inputs?h=master 2014-04-10T19:22:28Z 2014-04-10T19:22:28Z Torvald Riegel triegel@redhat.com 2013-10-08T11:17:01Z urn:sha1:6a5d6ea128153f5a00d8c80f15f76004006767da We have a single thread that runs a no-op initialization once and then repeatedly runs checks of the initialization (i.e., an acquire load and conditional jump) in a tight loop. This gives us, on average, the best-case latency of pthread_once (the initialization is the exactly-once slow path, and we're not looking at initialization-related synchronization overheads in this case).