CLOCKS_PER_SEC
From cppreference.com
C
Concurrency support (C11)
Date and time utilities
Functions
Time manipulation
(C11)
(C23)
Format conversions
(deprecated in C23)(C11)
(deprecated in C23)(C11)
(C95)
(C23)(C11)
(C23)(C11)
Constants
CLOCKS_PER_SEC
Types
(C11)
Defined in header
<time.h>
#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() .
[edit] Notes
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).
[edit] References
- 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
[edit] See also
C++ documentation for CLOCKS_PER_SEC