evglobals

evglobals

#include <ev_globals.h>

void ev_init_globals()

#include <ev_globals.h>

DESCRIPTION:
Initializes the global variables needed for evio (file library) to work.

size_t get_sys_pagesize()

#include <ev_globals.h>

DESCRIPTION:
Returns the size of a memory page as set in sysconf

It is necessary that ev_init_globals is called before this

uint64_t clock_gettime_nsec_np()

#include <ev_globals.h>

DESCRIPTION:
	Implementation of clock_gettime_nsec_np for linux and other non OSX systems

ARGUMENTS:
clockid_t clock_id

	clock_id should be one of

	CLOCK_REALTIME     the system's real time (i.e. wall time) clock, expressed as the amount of time since the Epoch.  This is the
					   same as the value returned by gettimeofday(2).

	CLOCK_MONOTONIC    clock that increments monotonically, tracking the time since an arbitrary point, and will continue to increment
					   while the system is asleep.

	CLOCK_MONOTONIC_RAW
					   clock that increments monotonically, tracking the time since an arbitrary point like CLOCK_MONOTONIC.  However,
					   this clock is unaffected by frequency or time adjustments.  It should not be compared to other system time
					   sources.

	CLOCK_MONOTONIC_RAW_APPROX
					   like CLOCK_MONOTONIC_RAW, but reads a value cached by the system at context switch.  This can be read faster,
					   but at a loss of accuracy as it may return values that are milliseconds old.

	CLOCK_UPTIME_RAW   clock that increments monotonically, in the same manner as CLOCK_MONOTONIC_RAW, but that does not increment
					   while the system is asleep.  The returned value is identical to the result of mach_absolute_time() after the
					   appropriate mach_timebase conversion is applied.

	CLOCK_UPTIME_RAW_APPROX
					   like CLOCK_UPTIME_RAW, but reads a value cached by the system at context switch.  This can be read faster, but
					   at a loss of accuracy as it may return values that are milliseconds old.

	CLOCK_PROCESS_CPUTIME_ID
					   clock that tracks the amount of CPU (in user- or kernel-mode) used by the calling process.

	CLOCK_THREAD_CPUTIME_ID
					   clock that tracks the amount of CPU (in user- or kernel-mode) used by the calling thread.


RETURN:
	Non zero value indicates success and the clock time in nanoseconds
	When zero is returned appropriate error is set in errno