!18 !optimize cpu used

* !optimize 时间追平漂移量时，损耗一点时间(微妙级别)降低CPU占用

PHP/src/snowflake/snowflake.c

@@ -4,6 +4,7 @@
 #else
 #include <unistd.h>
 #include <sys/time.h>
+#include <time.h>
 #endif
 #include <stdlib.h>
 #include <stdio.h>
@@ -221,7 +222,6 @@ static inline uint64_t GetSysCurrentTime()
 	gettimeofday(&t, NULL);
 	return (uint64_t)(t.tv_sec * 1000 + t.tv_usec / 1000);
 #endif
-
 }
 
 static inline uint64_t GetCurrentTimeTick(snowflake *flake)
@@ -232,9 +232,21 @@ static inline uint64_t GetCurrentTimeTick(snowflake* flake)
 static inline uint64_t GetNextTimeTick(snowflake *flake)
 {
 	uint64_t tempTimeTicker = GetCurrentTimeTick(flake);
-	while (tempTimeTicker <= flake->_LastTimeTick)
+	struct timespec delay;
+	delay.tv_sec = 0;
+	delay.tv_nsec = 500000;
+	while (1)
 	{
 		tempTimeTicker = GetCurrentTimeTick(flake);
+		if (tempTimeTicker > flake->_LastTimeTick)
+		{
+			break;
+		}
+#ifdef WIN32
+		SwitchToThread();
+#else
+		nanosleep(&delay, NULL);
+#endif
 	}
 	return tempTimeTicker;
 }