implement new main loop abstraction layer

git-svn-id: file:///home/lennart/svn/public/avahi/trunk@305 941a03a8-eaeb-0310-b9a0-b1bbd8fe43fe

1 files changed, 101 insertions, 0 deletions

diff --git a/avahi-common/timeval.c b/avahi-common/timeval.c
new file mode 100644
index 0000000..e5732cd
--- /dev/null
+++ b/avahi-common/timeval.c
@@ -0,0 +1,101 @@
+/* $Id$ */
+
+/***
+  This file is part of avahi.
+ 
+  avahi is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+ 
+  avahi is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+  or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
+  Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with avahi; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdlib.h>
+#include <assert.h>
+
+#include "timeval.h"
+
+int avahi_timeval_compare(const struct timeval *a, const struct timeval *b) {
+    assert(a);
+    assert(b);
+
+    if (a->tv_sec < b->tv_sec)
+        return -1;
+
+    if (a->tv_sec > b->tv_sec)
+        return 1;
+
+    if (a->tv_usec < b->tv_usec)
+        return -1;
+
+    if (a->tv_usec > b->tv_usec)
+        return 1;
+
+    return 0;
+}
+
+AvahiUsec avahi_timeval_diff(const struct timeval *a, const struct timeval *b) {
+    assert(a);
+    assert(b);
+
+    if (avahi_timeval_compare(a, b) < 0)
+        return - avahi_timeval_diff(b, a);
+
+    return ((AvahiUsec) a->tv_sec - b->tv_sec)*1000000 + a->tv_usec - b->tv_usec;
+}
+
+struct timeval* avahi_timeval_add(struct timeval *a, AvahiUsec usec) {
+    AvahiUsec u;
+    assert(a);
+
+    u = usec + a->tv_usec;
+
+    if (u < 0) {
+        a->tv_usec = (long) (1000000 + (u % 1000000));
+        a->tv_sec += (long) (-1 + (u / 1000000));
+    } else {
+        a->tv_usec = (long) (u % 1000000);
+        a->tv_sec += (long) (u / 1000000);
+    }
+
+    return a;
+}
+
+AvahiUsec avahi_age(const struct timeval *a) {
+    struct timeval now;
+    
+    assert(a);
+
+    gettimeofday(&now, NULL);
+
+    return avahi_timeval_diff(&now, a);
+}
+
+
+struct timeval *avahi_elapse_time(struct timeval *tv, unsigned msec, unsigned jitter) {
+    assert(tv);
+
+    gettimeofday(tv, NULL);
+
+    if (msec)
+        avahi_timeval_add(tv, (AvahiUsec) msec*1000);
+
+    if (jitter)
+        avahi_timeval_add(tv, (AvahiUsec) (jitter*1000.0*rand()/(RAND_MAX+1.0)));
+        
+    return tv;
+}
+