check that tap device is actually created

[sliver-openvswitch.git] / lib / timeval.h

diff --git a/lib/timeval.h b/lib/timeval.h
index cc50cb3..72cf498 100644 (file)
--- a/lib/timeval.h
+++ b/lib/timeval.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2008, 2009, 2010 Nicira Networks.
+ * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,6 +25,7 @@
 extern "C" {
 #endif
 
+struct ds;
 struct pollfd;
 struct timespec;
 struct timeval;
@@ -42,9 +43,20 @@ BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
 /* 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
+#define TIME_UPDATE_INTERVAL 25
+
+/* True on systems that support a monotonic clock.  Compared to just getting
+ * the value of a variable, clock_gettime() is somewhat expensive, even on
+ * systems that try hard to optimize it (such as x86-64 Linux), so it's
+ * worthwhile to minimize calls via caching. */
+#ifndef CACHE_TIME
+#if defined ESX
+#define CACHE_TIME 0
+#else
+#define CACHE_TIME 1
+#endif
+#endif /* ifndef CACHE_TIME */
 
-void time_init(void);
 void time_disable_restart(void);
 void time_enable_restart(void);
 void time_postfork(void);
@@ -56,11 +68,20 @@ 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