Monty 7fc25cfbca Fix for MDEV-12730 ...

Assertion `count > 0' failed in rpl_parallel_thread_pool::
get_thread, rpl.rpl_parallel failed in buildbot

The reason for this is that one thread can call
rpl_parallel_resize_pool_if_no_slaves() while
another thread calls at the same time
rpl_parallel_activate_pool(). If rpl_parallel_active_pool() is
called before rpl_parallel_resize_pool_if_no_slaves() has
finished, pool->count will be set to 0 even if there exists
active slave threads.

Added a mutex lock in rpl_parallel_activate_pool() to protect against this scenario, which seams to fix this issue.

2018-01-24 23:33:21 +02:00

88 KiB

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