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Using and Porting GNU Fortran

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MClock: INTEGER(KIND=1) function.

Intrinsic groups: unix.


Returns the number of clock ticks since the start of the process. Supported on systems with clock(3) (q.v.).

This intrinsic is not fully portable, such as to systems with 32-bit INTEGER types but supporting times wider than 32 bits. 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.

See section MClock8 Intrinsic, for information on a similar intrinsic that might be portable to more GNU Fortran implementations, though to fewer Fortran compilers.

If the system does not support clock(3), -1 is returned.

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