1 files changed, 30 insertions, 0 deletions
diff --git a/src/basic/ratelimit.h b/src/basic/ratelimit.h
new file mode 100644
index 0000000..492ea3b
--- /dev/null
+++ b/src/basic/ratelimit.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <stdbool.h>
+
+#include "time-util.h"
+
+typedef struct RateLimit {
+        usec_t interval; /* Keep those two fields first so they can be initialized easily: */
+        unsigned burst;  /*   RateLimit rl = { INTERVAL, BURST }; */
+        unsigned num;
+        usec_t begin;
+} RateLimit;
+
+#define RATELIMIT_OFF (const RateLimit) { .interval = USEC_INFINITY, .burst = UINT_MAX }
+
+static inline void ratelimit_reset(RateLimit *rl) {
+        rl->num = rl->begin = 0;
+}
+
+static inline bool ratelimit_configured(RateLimit *rl) {
+        return rl->interval > 0 && rl->burst > 0;
+}
+
+bool ratelimit_below(RateLimit *r);
+
+unsigned ratelimit_num_dropped(RateLimit *r);
+
+usec_t ratelimit_end(const RateLimit *rl);
+usec_t ratelimit_left(const RateLimit *rl);