GateMP too slow

Is there any alternative way to protect shared memory except GateMP

Following code

	unsigned ts1 = Timestamp_get32();
	IArg key = GateMP_enter(gate);
	GateMP_leave(gate, key);
	unsigned ts2 = Timestamp_get32();
	printf("Gate enter/leave in %d ns\n", ts2 - ts1);

runs 6500 cycles which is too slow. 

What is a common way of fast memory protection in SYS/BIOS, may be spinlocks. Or maybe there are SoC registers in C6678 for this purposes which are read in 1 cycle.