Fix: handle clock offset with frequency different from 1GHz

[babeltrace.git] / include / babeltrace / clock-internal.h

diff --git a/include/babeltrace/clock-internal.h b/include/babeltrace/clock-internal.h
new file mode 100644 (file)
index 0000000..6fbc7c3
--- /dev/null
+++ b/include/babeltrace/clock-internal.h
@@ -0,0 +1,37 @@
+#ifndef _BABELTRACE_CLOCK_INTERNAL_H
+#define _BABELTRACE_CLOCK_INTERNAL_H
+
+/*
+ * BabelTrace
+ *
+ * clocks header (internal)
+ *
+ * Copyright 2012 EfficiOS Inc. and Linux Foundation
+ *
+ * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *         Julien Desfossez <julien.desfossez@efficios.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ */
+
+static inline
+uint64_t clock_cycles_to_ns(struct ctf_clock *clock, uint64_t cycles)
+{
+       if (clock->freq == 1000000000ULL) {
+               /* 1GHZ freq, no need to scale cycles value */
+               return cycles;
+       } else {
+               return (double) cycles * 1000000000.0
+                               / (double) clock->freq;
+       }
+}
+
+#endif /* _BABELTRACE_CLOCK_INTERNAL_H */