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()
.
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)
- 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
See also
returns raw processor clock time since the program is started (function) | |
processor time since era type (typedef) | |
C++ documentation for CLOCKS_PER_SEC |
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