extern "C" {
#endif
+struct ds;
struct pollfd;
struct timespec;
struct timeval;
* 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
+/* 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_alarm(unsigned int secs);
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);