About Barrier Breakpoint States

Totalview® User Guide : Part II: Debugging Tools and Tasks : Setting Action Points : Setting Breakpoints and Barriers : Setting Barrier Points : About Barrier Breakpoint States

Processes and threads at a barrier point are held or stopped, as follows:

Held

A held process or thread cannot execute until all the processes or threads in its group are at the barrier, or until you manually release it. The various go and step commands from the Group, Process, and Thread menus cannot start held processes.

Stopped

When all processes in the group reach a barrier point, TotalView automatically releases them. They remain stopped at the barrier point until you tell them to resume executing.

You can manually release held processes and threads with the Hold and Release commands found in the Group, Process, and Thread menus. When you manually release a process, the go and step commands become available again.


CLI: dfocus ... dhold dfocus ... dunhold

You can reuse the Hold command to again toggle the hold state of the process or thread. See “Holding and Releasing Processes and Threads” for more information.

When a process or a thread is held, TotalView displays an H (for a held process) or an h (for a held thread) in the process’s or thread’s entry in the Root Window.