MCLOCK8 (The GNU Fortran Compiler) (original) (raw)

8.193 MCLOCK8 — Time function (64-bit) ¶

Synopsis:

RESULT = MCLOCK8()

Description:

Returns the number of clock ticks since the start of the process, based on the function clock(3) in the C standard library.

Warning: this intrinsic does not increase the range of the timing values over that returned by clock(3). On a system with a 32-bitclock(3), MCLOCK8 returns a 32-bit value, even though it is converted to a 64-bit INTEGER(8) value. That means overflows of the 32-bit value can still occur. Therefore, the values returned by this intrinsic might be or become negative or numerically less than previous values during a single run of the compiled program.

Class:

Function

Return value:

The return value is a scalar of type INTEGER(8), equal to the number of clock ticks since the start of the process, or -1 if the system does not support clock(3).

Standard:

GNU extension

See also:

CTIME — Convert a time into a string,
GMTIME — Convert time to GMT info,
LTIME — Convert time to local time info,
MCLOCK — Time function,
TIME8 — Time function (64-bit)