commit 49eddd2337228f3008449ea7d8b2078e17b5ac3a
author Maxim Dounin <mdounin@mdounin.ru> Tue Apr 19 17:18:28 2016 +0300
committer Maxim Dounin <mdounin@mdounin.ru> Tue Apr 19 17:18:28 2016 +0300
tree de1673636b459bd5f057c4c90a25ff1ebaceb24b
parent b34b04dd09a9ce7acc88999961eeaee992431470

Thread pools: memory barriers in task completion notifications.

The ngx_thread_pool_done object isn't volatile, and at least some
compilers assume that it is permitted to reorder modifications of
volatile and non-volatile objects.  Added appropriate ngx_memory_barrier()
calls to make sure all modifications will happen before the lock is released.

Reported by Mindaugas Rasiukevicius,
http://mailman.nginx.org/pipermail/nginx-devel/2016-April/008160.html.