HP aC++/HP C A.06.25 Programmer's Guide

+check=stack:frame
This option enables runtime checks for illegal writes from the current stack frame that
overflow into the previous stack frame.
+check=stack:variables
This option enables runtime checks for illegal writes to the stack just before or after
some variables on the stack. This includes array, struct/class/union, and variables
whose address is taken. It also includes the overflow check for the stack frame
(+check=stack:frame). In addition to the above checks, this option causes the whole
stack to be initialized to a "poison" value, which can help detect the use of uninitialized
variables on the stack.
+check=stack:none
This option disables all runtime checks for the stack.
+check=stack
The +check=stackoption without any qualifiers is equivalent to
+check=stack:variables at optimization levels 0 and 1. It is equivalent to
+check=stack:frame for optimization level 2 and above.
+check=thread
The +check=thread option enables the batch-mode thread-debugging features of
HP WDB 5.9 or later, and can detect the following thread-related conditions:
• The thread attempts to acquire a nonrecursive mutex that it currently holds.
• The thread attempts to unlock a mutex or a read-write lock that it has not acquired.
• The thread waits (blocked) on a mutex or read-write lock that is held by a thread
with a different scheduling policy.
• Different threads non-concurrently wait on the same condition variable, but with
different associated mutexes.
• The threads terminate execution without unlocking the associated mutexes or
read-write locks.
• The thread waits on a condition variable for which the associated mutex is not
locked.
• The thread terminates execution, and the resources associated with the terminated
thread continue to exist in the application because the thread has not been joined
or detached.
• The thread uses more than the specified percentage of the stack allocated to the
thread.
The +check=thread option should only be used with multithreaded programs. It is
not enabled by +check=all.
Users can change the behavior of the +check=thread option by providing their own
rtcconfig file. The user specified rtcconfig file can be in the current directory
108 Command-Line Options