Function try_write_lock

kernels/subdiv/subdivpatch1base.h:71–71

    __forceinline void write_lock()     { mtx.lock();   }
    __forceinline void write_unlock()   { mtx.unlock(); }
    __forceinline bool try_write_lock() { return mtx.try_lock(); }
    //__forceinline bool try_read_lock()  { return mtx.try_read_lock(); }

    __forceinline void resetRootRef() {