3.4.56 –mt

Require linking to thread–safe libraries.

If you do your own low–level thread management (for example, by calling the libthread library), compiling with -mt prevents conflicts.

Use -mt if you mix Fortran with multithreaded C code that calls the libthread library. See also the Solaris Multithreaded Programming Guide.

–mt is implied automatically when compiling with the -autopar option.

Note the following:

• A function subprogram that does I/O should not itself be referenced as part of an I/O statement. Such recursive I/O may cause the program to deadlock with -mt.

• In general, do not compile your own multithreaded code with -autopar. The compiler-generated calls to the threads library and the program’s own calls may conflict, causing unexpected results.

• On a single–processor system, performance may be degraded with the -mt option.