The open source OpenXR runtime
os/time: Add time getting and conversion functions
For Linux it is based on CLOCK_MONOTONIC.
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src/xrt/auxiliary/os/os_time.h
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src/xrt/auxiliary/os/os_time.h
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#ifdef XRT_OS_LINUX
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#include <time.h>
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#include <sys/time.h>
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#else
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#error "No time support on non-Linux platforms yet."
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!
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* Write an output report to the given device.
···
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nanosleep(&spec, NULL);
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#endif
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}
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#ifdef XRT_OS_LINUX
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/*!
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* Convert a timespec struct to nanoseconds.
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*/
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XRT_MAYBE_UNUSED static inline uint64_t
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os_timespec_to_ns(struct timespec *spec)
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{
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uint64_t ns = 0;
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ns += (uint64_t)spec->tv_sec * 1000 * 1000 * 1000;
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ns += (uint64_t)spec->tv_nsec;
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return ns;
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}
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/*!
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* Convert a timeval struct to nanoseconds.
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*/
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XRT_MAYBE_UNUSED static inline uint64_t
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os_timeval_to_ns(struct timeval *val)
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{
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uint64_t ns = 0;
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ns += (uint64_t)val->tv_sec * 1000 * 1000 * 1000;
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ns += (uint64_t)val->tv_usec * 1000;
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return ns;
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}
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/*!
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* Return a monotonic clock in nanoseconds.
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*/
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XRT_MAYBE_UNUSED static inline uint64_t
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os_monotonic_get_ns(void)
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{
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struct timespec ts;
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int ret = clock_gettime(CLOCK_MONOTONIC, &ts);
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if (ret != 0) {
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return 0;
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}
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return os_timespec_to_ns(&ts);
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}
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#endif
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#ifdef __cplusplus
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}