mailing list of musl libc

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 #include "pthread_impl.h"

static inline void __lock_fast(volatile int *l)
{
	extern void __lock_slow(volatile int*, int);
	if (!libc.threads_minus_1) return;
	/* fast path: INT_MIN for the lock, +1 for the congestion */
	int current = a_cas(l, 0, INT_MIN + 1);
	if (!current) return;
	__lock_slow(l, current);
}

static inline void __unlock_fast(volatile int *l)
{
	/* Check l[0] to see if we are multi-threaded. */
	if (l[0] < 0) {
		if (a_fetch_add(l, -(INT_MIN + 1)) != (INT_MIN + 1)) {
			__wake(l, 1, 1);
		}
	}
}