From: Guus Sliepen <guus@sliepen.org>
Date: Sun, 29 Mar 2020 13:39:01 +0000 (+0200)
Subject: Add utcp_set_clock_granularity().
X-Git-Url: http://git.meshlink.io/?p=utcp;a=commitdiff_plain;h=bf55733700d946f678947a6caaa782b56669a3f1

Add utcp_set_clock_granularity().

This overrides the value gotten from clock_getres(), and is intended for
use by an application that knows it might not call utcp_timeout()
exactly on time.
---

diff --git a/utcp.c b/utcp.c
index cc17b0f..0b36de1 100644
--- a/utcp.c
+++ b/utcp.c
@@ -73,7 +73,7 @@ static bool timespec_isset(const struct timespec *a) {
 	return a->tv_sec;
 }
 
-static long CLOCK_GRANULARITY;
+static long CLOCK_GRANULARITY; // usec
 
 static inline size_t min(size_t a, size_t b) {
 	return a < b ? a : b;
@@ -2056,7 +2056,7 @@ struct utcp *utcp_init(utcp_accept_t accept, utcp_pre_accept_t pre_accept, utcp_
 	if(!CLOCK_GRANULARITY) {
 		struct timespec res;
 		clock_getres(UTCP_CLOCK, &res);
-		CLOCK_GRANULARITY = res.tv_sec * NSEC_PER_SEC + res.tv_nsec;
+		CLOCK_GRANULARITY = res.tv_sec * USEC_PER_SEC + res.tv_nsec / 1000;
 	}
 
 	utcp->accept = accept;
@@ -2331,3 +2331,7 @@ void utcp_offline(struct utcp *utcp, bool offline) {
 		utcp->rto = START_RTO;
 	}
 }
+
+void utcp_set_clock_granularity(long granularity) {
+	CLOCK_GRANULARITY = granularity;
+}
diff --git a/utcp.h b/utcp.h
index 40cfef6..aed177c 100644
--- a/utcp.h
+++ b/utcp.h
@@ -116,4 +116,8 @@ extern size_t utcp_get_outq(struct utcp_connection *connection);
 
 extern void utcp_expect_data(struct utcp_connection *connection, bool expect);
 
+// Completely global options
+
+extern void utcp_set_clock_granularity(long granularity);
+
 #endif