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由 Peter Krempa 提交于
Among all the monitor APIs some where checking if mon is NULL and some were not. Since it's possible to have mon equal to NULL in case a second call is attempted once entered the monitor. This requires that every single API checks for the monitor. This patch adds a macro that helps checking the state of the monitor and either refactors existing checking code to use the macro or adds it in case it was missing.
c4410852