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libsst-concurrency/timespecadd.h

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+/*
+	timespecadd.h
+	Author: Patrick Baggett <ptbaggett@762studios.com>
+	Created: 4/11/2012
+
+	Purpose: 
+
+	Inline code for adding struct timespec, common in UNIX APIs.
+
+	License:
+
+	This program is free software. It comes without any warranty, to
+	the extent permitted by applicable law. You can redistribute it
+	and/or modify it under the terms of the Do What The Fuck You Want
+	To Public License, Version 2, as published by Sam Hocevar. See
+	http://sam.zoy.org/wtfpl/COPYING for more details.
+
+*/
+
+#pragma once
+
+#ifndef _SST_CONCURRENCY_TIMESPECADD_H
+#define _SST_CONCURRENCY_TIMESPECADD_H
+#include <SST/SST_Build.h> /* INLINE definition */
+
+/*
+	Compute t1 += t2 in a way that UNIX doesn't bitch. Adding the
+	tv_nsec fields is bad when they exceed 1B nsec (i.e. 1 sec), so
+	one must add and then check for overflow. Assumed that t1, t2
+	have tv_nsec fields that are each < 1e9
+*/
+static INLINE void _sst_add_timespec(struct timespec* t1, const struct timespec* t2)
+{
+	t1->tv_sec += t2->tv_sec;
+	t1->tv_nsec += t2->tv_nsec;
+
+	if(t1->tv_nsec > 1000000000)
+	{
+		t1->tv_nsec -= 1000000000;
+		t1->tv_sec += 1;
+	}
+}
+
+
+#endif