As noted in this message: http://gcc.gnu.org/ml/fortran/2007-03/msg00339.html
This should probably be documented in the manual. -- Summary: Thread-safety of random_number should be documented. Product: gcc Version: 4.3.0 Status: UNCONFIRMED Keywords: documentation Severity: enhancement Priority: P3 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: brooks at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31234