/*
- * Copyright (c) 2008, 2009, 2010 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.
extern "C" {
#endif
+struct ds;
struct pollfd;
+struct timespec;
struct timeval;
/* POSIX allows floating-point time_t, but we don't support it. */
#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