innobase/include/srv0srv.h:
Define SRV_CONCURRENCY_THRESHOLD
innobase/srv/srv0srv.c:
Remove srv_thread_concurrency check from srv_conc_enter_innodb()
and srv_conc_exit_innodb(), as the check is in the (only) caller
of these functions, in ha_innodb.cc.
srv_conc_force_enter_innodb(), srv_conc_force_exit_innodb():
Check for srv_thread_concurrency >= SRV_CONCURRENCY_THRESHOLD
sql/ha_innodb.cc:
Make use of SRV_CONCURRENCY_THRESHOLD
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