On Sep 5, 2011, at 2:17 PM, Dave Abrahams wrote:
on Mon Sep 05 2011, Mathias Gaunard <mathias.gaunard-AT-ens-lyon.org> wrote:
The C++11 standard (the only one aware of multithreading) mandates that initialization of static variables at function scope is thread-safe.
Really? I didn't pay attention to ever twist or turn of the process of standardizing multithreading, but it greatly surprises me to hear that, because it would impose an overhead on those function-static variables that don't need synchronization. Can you cite the paragraphs that give this guarantee?
SC-22-N-411, 6.7/4 "Declaration statement" says, while discussing initialization of an object with static storage duration the first time control passes through its declaration: If control enters the declaration concurrently while the object is being initialized, the concurrent execution shall wait for completion of the initialization.