CLOCKS_PER_SEC
| Defined in header <time.h>
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| #define CLOCKS_PER_SEC /*implementation defined*/ |
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Expands to an expression (not necessarily a compile-time constant) of type clock_t equal to the number of clock ticks per second, as returned by clock().
Notes
POSIX defines CLOCKS_PER_SEC as one million, regardless of the actual precision of clock.
Until standardized as CLOCKS_PER_SEC in C89, this macro was sometimes known by its IEEE std 1003.1-1988 name CLK_TCK: that name was not included in C89 and was removed from POSIX itself in 1996 over ambiguity with _SC_CLK_TCK, which gives number of clocks per second for the function times()).
References
- C11 standard (ISO/IEC 9899:2011):
- 7.27.1/2 Components of time (p: 388)