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4  * congestion count (= threads inside the critical section, CS) in a
5  * single int that is accessed through atomic operations. The states
8  * x == 0: unlocked and no thread inside the critical section
10  * x < 0: locked with a congestion of x-INT_MIN, including the thread
15  * or in an equivalent formulation x is the congestion count or'ed
23 	/* fast path: INT_MIN for the lock, +1 for the congestion */  in __lock()
29 		if (current < 0) current -= INT_MIN + 1;  in __lock()
35 	// Spinning failed, so mark ourselves as being inside the CS.  in __lock()
38 	 * change to the value performed inside that loop is a successful  in __lock()
45 			current -= INT_MIN + 1;  in __lock()
56 	/* Check l[0] to see if we are multi-threaded. */  in __unlock()
58 		if (a_fetch_add(l, -(INT_MIN + 1)) != (INT_MIN + 1)) {  in __unlock()