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CLOCKS_PER_SEC - cppreference.com

#define CLOCKS_PER_SEC /* implementation-defined */

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().

POSIX defines CLOCKS_PER_SEC as 1'000'000, 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).

• C23 standard (ISO/IEC 9899:2024):

• 7.27.1/2 Components of time (p: TBD)

• C17 standard (ISO/IEC 9899:2018):

• 7.27.1/2 Components of time (p: 284)

• C11 standard (ISO/IEC 9899:2011):

• 7.27.1/2 Components of time (p: 388)

• C99 standard (ISO/IEC 9899:1999):

• 7.23.1/2 Components of time (p: 338)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.12.1 Components of time

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