Move time utils to their own time.c file

[lttng-tools.git] / src / common / time.c

diff --git a/src/common/time.c b/src/common/time.c
new file mode 100644 (file)
index 0000000..5c55945
--- /dev/null
+++ b/src/common/time.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <common/time.h>
+#include <common/macros.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <limits.h>
+#include <errno.h>
+#include <pthread.h>
+
+LTTNG_HIDDEN
+int timespec_to_ms(struct timespec ts, unsigned long *ms)
+{
+       unsigned long res, remain_ms;
+
+       if (ts.tv_sec > ULONG_MAX / MSEC_PER_SEC) {
+               errno = EOVERFLOW;
+               return -1;      /* multiplication overflow */
+       }
+       res = ts.tv_sec * MSEC_PER_SEC;
+       remain_ms = ULONG_MAX - res;
+       if (ts.tv_nsec / NSEC_PER_MSEC > remain_ms) {
+               errno = EOVERFLOW;
+               return -1;      /* addition overflow */
+       }
+       res += ts.tv_nsec / NSEC_PER_MSEC;
+       *ms = res;
+       return 0;
+}
+
+LTTNG_HIDDEN
+struct timespec timespec_abs_diff(struct timespec t1, struct timespec t2)
+{
+       uint64_t ts1 = (uint64_t) t1.tv_sec * (uint64_t) NSEC_PER_SEC +
+                       (uint64_t) t1.tv_nsec;
+       uint64_t ts2 = (uint64_t) t2.tv_sec * (uint64_t) NSEC_PER_SEC +
+                       (uint64_t) t2.tv_nsec;
+       uint64_t diff = max(ts1, ts2) - min(ts1, ts2);
+       struct timespec res;
+
+       res.tv_sec = diff / (uint64_t) NSEC_PER_SEC;
+       res.tv_nsec = diff % (uint64_t) NSEC_PER_SEC;
+       return res;
+}