/*
- * 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.
* ever encounter such a platform. */
BUILD_ASSERT_DECL(TYPE_IS_SIGNED(time_t));
+/* On x86-64 systems, Linux avoids using syscalls for clock_gettime().
+ *
+ * For systems which do invoke a system call we wait at least
+ * TIME_UPDATE_INTERVAL ms between clock_gettime() calls and cache the time for
+ * the interim.
+ *
+ * For systems which do not invoke a system call, we just call clock_gettime()
+ * whenever the time is requested. As a result we don't start the background
+ * SIGALRM timer unless explicitly needed by time_alarm() */
+#if defined __x86_64__ && defined __linux__
+#define CACHE_TIME 0
+#else
+#define CACHE_TIME 1
+#endif
+
#define TIME_MAX TYPE_MAXIMUM(time_t)
#define TIME_MIN TYPE_MINIMUM(time_t)
* much time will be wasted in signal handlers and calls to clock_gettime(). */
#define TIME_UPDATE_INTERVAL 100
-void time_init(void);
void time_disable_restart(void);
void time_enable_restart(void);
void time_postfork(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);
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);
+
+long long int time_boot_msec(void);
+
#ifdef __cplusplus
}
#endif