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#ifndef _PCILIB_TIMING_H
#define _PCILIB_TIMING_H
#include <sys/time.h>
#include <pcilib.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* Add the specified number of microseconds to the time stored in \p tv
* @param[in,out] tv - timestamp
* @param[in] timeout - number of microseconds to add
* @return - error code or 0 for correctness
*/
int pcilib_add_timeout(struct timeval *tv, pcilib_timeout_t timeout);
/**
* Computes the deadline by adding the specified number of microseconds to the current timestamp
* @param[out] tv - the deadline
* @param[in] timeout - number of microseconds to add
* @return - error code or 0 for correctness
*/
int pcilib_calc_deadline(struct timeval *tv, pcilib_timeout_t timeout);
/**
* Check if we are within \p timeout microseconds before the specified deadline or already past it
* @param[in] tv - the deadline
* @param[in] timeout - maximum number of microseconds before deadline
* @return - 1 if we are within \p timeout microseconds before deadline or past it, 0 - otherwise
*/
int pcilib_check_deadline(struct timeval *tv, pcilib_timeout_t timeout);
/**
* Compute the remaining time to deadline
* @param[in] tv - the deadline
* @return - number of microseconds until deadline or 0 if we are already past it
*/
pcilib_timeout_t pcilib_calc_time_to_deadline(struct timeval *tv);
/**
* Executes sleep until the specified deadline
* Real-time capabilities are not used. TThe sleep could wake slightly after the specified deadline.
* @param[in] tv - the deadline
* @return - error code or 0 for correctness
*/
int pcilib_sleep_until_deadline(struct timeval *tv);
/**
* Computes the number of microseconds between 2 timestamps.
* This function expects that \p tve is after \p tvs.
* @param[in] tve - the end of the time interval
* @param[in] tvs - the beginning of the time interval
* @return - number of microseconds between two timestamps
*/
pcilib_timeout_t pcilib_timediff(struct timeval *tve, struct timeval *tvs);
/**
* Compares two timestamps
* @param[in] tv1 - the first timestamp
* @param[in] tv2 - the second timestamp
* @return - 0 if timestamps are equal, 1 if the first timestamp is after the second, or -1 if the second is after the first.
*/
int pcilib_timecmp(struct timeval *tv1, struct timeval *tv2);
#ifdef __cplusplus
}
#endif
#endif /* _PCILIB_TIMING_H */
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