9.262. SYSTEM_CLOCK
9.262 SYSTEM_CLOCK — Time function
- Description:
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Determines the COUNT of a processor clock since an unspecified time in the past modulo COUNT_MAX, COUNT_RATE determines the number of clock ticks per second. If the platform supports a monotonic clock, that clock is used and can, depending on the platform clock implementation, provide up to nanosecond resolution. If a monotonic clock is not available, the implementation falls back to a realtime clock.
COUNT_RATE is system dependent and can vary depending on the kind of the arguments. For kind=4 arguments (and smaller integer kinds), COUNT represents milliseconds, while for kind=8 arguments (and larger integer kinds), COUNT typically represents micro- or nanoseconds depending on resolution of the underlying platf