geopm_time(3) – helper methods for time
Synopsis
#include <geopm_time.h>
Link with -lgeopm (MPI) or -lgeopm (non-MPI)
static inline int geopm_time_string(int buf_size,
char *buf);
static inline int geopm_time(struct geopm_time_s *time);
static inline double geopm_time_diff(const struct geopm_time_s *begin,
const struct geopm_time_s *end);
static inline bool geopm_time_comp(const struct geopm_time_s *aa,
const struct geopm_time_s *bb);
static inline void geopm_time_add(const struct geopm_time_s *begin,
double elapsed,
struct geopm_time_s *end);
static inline double geopm_time_since(const struct geopm_time_s *begin);
int geopm_time_zero(struct geopm_time_s *zero_time);
Description
The geopm_time.h header defines GEOPM interfaces for measuring time
in seconds relative to a fixed arbitrary reference point. The geopm_time_s
structure is used to hold time values.
geopm_time_string()Fills buf with the current date and time as a string. The string will be null-terminated and truncated to buf_size, which must be at least 26 characters as required by asctime_r(3).
geopm_time()Sets time to the current time.
geopm_time_diff()Returns the difference in seconds between begin and end.
geopm_time_comp()Return true if aa is less than bb.
geopm_time_add()Sets end to elapsed seconds after begin.
geopm_time_since()Returns the number of seconds elapsed between the current time and begin.
Structure Type
This structure is part of the global C namespace.
This structure is used to abstract the timespec on Linux from other representations of time.
The field struct timespec t is a POSIX.1b structure for a time value.
This is like a struct timeval but has nanoseconds instead of microseconds.
struct geopm_time_s {
struct timespec t;
};
Singleton Accessor
geopm_time_zero()Is the accessor for the
TimeZerosingleton. It records the earliest time request for the process.