sched: add support for scheduling functions to be executed later

include/socks/util.h

@@ -9,6 +9,10 @@
 extern "C" {
 #endif
 
+#define MIN(x, y) ((x) < (y) ? (x) : (y))
+#define MAX(x, y) ((x) > (y) ? (x) : (y))
+#define CLAMP(x, lo, hi) (MIN(MAX(x, lo), hi))
+
 extern uint64_t hash_string(const char *s);
 extern void data_size_to_string(size_t value, char *out, size_t outsz);
 static inline bool power_of_2(size_t x) { return (x > 0 && (x & (x - 1)) == 0); }