Writing Multi-threaded Applications

Chapter 4: Multi-threading Compiler Directives

The following two directives effect the serialization and reentrancy of multi-threaded programs:

• REENTRANT - Controls reentrancy of a program

• SERIAL - Controls serialization of a program

The following Compiler directives can optimize the performance of multi-threading programs:

• PARAMCOUNTCHECK - Controls checking of number of entry point parameters

• FASTCALLS - Controls the behavior of a called program

• FIXOPT - Controls placing of certain control areas

• FASTLINK - Controls handling of parameters

The following directive settings are made by default:

PARAMCOUNTCHECK NOFASTCALLS NOREENTRANT NOSERIAL FIXOPT

Note that if you set the FASTLINK directive with these default directives, it will not work as TYPECHECK and FIXOPT are set. If you want your program to be optimized for speed, set the directives as follows:

NOTYPECHECK 
FASTCALLS 
NOREENTRANT 
NOSERIAL 
NOFIXOPT 
FASTLINK

However, note that you might have to change your program to take advantage of these Compiler directives.

Writing Multi-threaded Applications