Describe dummy test model. Work on OpenFlow intro.

[openvswitch] / lib / timeval.h

diff --git a/lib/timeval.h b/lib/timeval.h
index 8567d75475d26bab3961f33083ec5f765eebb294..5a7b6e25c62aeabc09b3b1089913446a828a8576 100644 (file)
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -21,7 +21,13 @@
 #include "type-props.h"
 #include "util.h"
 
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+struct ds;
 struct pollfd;
+struct timespec;
 struct timeval;
 
 /* POSIX allows floating-point time_t, but we don't support it. */
@@ -34,19 +40,56 @@ BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
 #define TIME_MAX TYPE_MAXIMUM(time_t)
 #define TIME_MIN TYPE_MINIMUM(time_t)
 
-/* Interval between updates to the time reported by time_gettimeofday(), in ms.
- * This should not be adjusted much below 10 ms or so with the current
- * implementation, or too much time will be wasted in signal handlers and calls
- * to time(0). */
+/* Interval between updates to the reported time, in ms.  This should not be
+ * adjusted much below 10 ms or so with the current implementation, or too
+ * much time will be wasted in signal handlers and calls to clock_gettime(). */
 #define TIME_UPDATE_INTERVAL 100
 
-void time_init(void);
+/* True on systems (particularly x86-64 Linux) where clock_gettime() is
+ * inexpensive.  On these systems, we don't bother caching the current time.
+ * Instead, we consult clock_gettime() directly when needed.
+ *
+ * False on systems where clock_gettime() is relatively expensive.  On these
+ * systems, we cache the current time and set up a periodic SIGALRM to remind
+ * us to update it.
+ *
+ * Also false on systems (e.g. ESX) that don't support setting up timers based
+ * on a monotonically increasing clock. */
+#ifndef CACHE_TIME
+#if defined ESX || (defined __x86_64__ && defined LINUX_DATAPATH)
+#define CACHE_TIME 0
+#else
+#define CACHE_TIME 1
+#endif
+#endif /* ifndef CACHE_TIME */
+
+void time_disable_restart(void);
+void time_enable_restart(void);
 void time_postfork(void);
 void time_refresh(void);
 time_t time_now(void);
+time_t time_wall(void);
 long long int time_msec(void);
-void time_timeval(struct timeval *);
+long long int time_wall_msec(void);
+void time_timespec(struct timespec *);
+void time_wall_timespec(struct timespec *);
 void time_alarm(unsigned int secs);
-int time_poll(struct pollfd *, int n_pollfds, int timeout);
+int time_poll(struct pollfd *, int n_pollfds, long long int timeout_when,
+              int *elapsed);
+bool time_cached(void);
+
+long long int timespec_to_msec(const struct timespec *);
+long long int timeval_to_msec(const struct timeval *);
+
+void xgettimeofday(struct timeval *);
+
+int get_cpu_usage(void);
+void format_backtraces(struct ds *, size_t min_count);
+
+long long int time_boot_msec(void);
+
+#ifdef  __cplusplus
+}
+#endif
 
 #endif /* timeval.h */