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set heap-check high-mem-count
X_number
Stops when brk() value has moved X_number
of times.
Limitations:
• This feature assumes that an application has a deterministic memory allocation
pattern from one run to another.
• The high_mem feature is not supported in batch mode debugging.
14.11 Thread Debugging Support
HP WDB provides thread-debugging support for kernel, user, and MxN threads. You
can exclusively disable or enable specific thread execution. Advanced thread debugging
support in HP WDB enables you to view information on pthread primitives and detect
certain thread-related conditions.
NOTE: WDB supports pthread parallelism, but it does not support
compiler-generated parallelism such as parallelism with directives.
14.11.1 Support for Enabling and Disabling Specific Threads
When you suspect that a specific thread is causing a problem while debugging a multi-
threaded application, you can suspend the execution of other threads in the application
and debug the doubtful thread exclusively. HP WDB 3.2 and later versions provide
the following commands to disable and enable specific thread execution:
thread disable
This command prevents the specified threads from running
until they are enabled again using the thread enable
command.
thread enable
This command enables the specified thread to run when you
issue the continue or step command. By default, all threads
are in the enabled state. You can use the thread enable
command to reactivate a disabled thread.
Consider the following example:
(gdb) info threadsystem thread 4189 0x7f666da8
in __pthread_create_system+0x3d8 () from /usr/lib/libpthread.1
2 system thread 4188 worker (wptr=0x40004640 ") at quicksort.c:135
1 system thread 4184 0x7f66f728 in _lwp_create+0x10 () from /usr/lib/libpthread.1
To disable a thread, execute the following command:
(gdb) thread disable 1
warning: ATTENTION!! Disabling threads may result in
deadlocks in the program.Disabling thread 1
To enable a thread, execute the following command:
(gdb) thread enable 1
Enabling thread 1
14.11 Thread Debugging Support 181