In the shell, dbx is the debugging facility for z/OS XL C/C++ programs. With dbx, you can debug multithreaded applications at the C-source level or at the machine level. Support for multithreaded applications gives you the ability to:

• Debug or display information about the following objects related to multithreaded applications: threads, mutexes, and condition variables.
• Control program execution by holding and releasing individual threads

The dbx debugger provides support for recognizing, displaying, and modifying program variables and constants that include double-byte character set (DBCS) characters.