添加获取时间戳函数用于测试性能

src/include/utils.h

@@ -3,12 +3,14 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
+#include <sys/time.h>
 
 #define LENGTH(X) (sizeof(X) / sizeof(X)[0])
 
 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
 
+double get_time();
 void die(const char *format, ...);
 void *ecalloc(size_t number_of_member, size_t member_size);