修复多平台编译问题

PHP/src/snowflake/spinlock.c

@@ -36,11 +36,7 @@ void spin_lock(atomic_t* lock, uint32_t pid)
 
 				for (i = 0; i < n; i++)
 				{
-#ifdef WIN32
-					MemoryBarrier();
-#else 
-					__asm("pause");
-#endif 
+					atomic_cpu_pause();
 				}
 
 				if (*lock == 0 &&

PHP/src/snowflake/spinlock.h

@@ -8,4 +8,14 @@ extern void spin_lock(atomic_t *lock, uint32_t pid);
 
 extern void spin_unlock(atomic_t *lock, uint32_t pid);
 
+#if defined(WIN32)
+#define atomic_cpu_pause() MemoryBarrier();
+#elif defined(__x86_64__)
+#define atomic_cpu_pause() __asm__ __volatile__("pause")
+#elif defined(__aarch64__)
+#define atomic_cpu_pause() __asm__ __volatile__("yield")
+#else
+#define atomic_cpu_pause()
+#endif
+
 #endif