DCE for the HP e3000 (B3821-90003)

30 Chapter3
Threads Architecture on MPE/iX
Threads Architecture
TERM_KEEPLOCK Allows a process to retain the terminal
semaphore under all conditions until
the process terminates or the variable
is reset to FALSE. However, this
variable has the potential to create a
deadlock. For example, a deadlock
occurs if the process owning the
terminal semaphore waits for another
process that in turn is waiting for the
debug terminal semaphore.
Limitations
The following are know limitations for the debug thread commands:
• The break command followed by an abort command hangs the task
if the initial thread is waiting to enter debug (such as, another
thread is currently in debug).
• The SUSPEND command has the potential to hang a task if the user
does not issue an ACTIVATE command before doing the CONTINUE
command.
• Each thread has its own debug environment. For example, loaded
macros and environmental variables are not shared by threads
within a task, and must be dealt with on an individual basis for each
thread.