GDB allows the following task-related commands:
This command shows a list of current Ada tasks, as in the following example:
(gdb) info tasks ID TID P-ID Thread Pri State Name 1 8088000 0 807e000 15 Child Activation Wait main_task 2 80a4000 1 80ae000 15 Accept/Select Wait b 3 809a800 1 80a4800 15 Child Activation Wait a * 4 80ae800 3 80b8000 15 Running c
In this listing, the asterisk before the first task indicates it to be the currently running task. The first column lists the task ID that is used to refer to tasks in the following commands.
These commands are like the break ... thread .... linespec specifies source lines.
Use the qualifier
task `taskid'with a breakpoint command to specify that you only want GDB to stop the program when a particular Ada task reaches this breakpoint. taskid is one of the numeric task identifiers assigned by GDB, shown in the first column of the
If you do not specify
task `taskid'when you set a breakpoint, the breakpoint applies to `all' tasks of your program.
You can use the task qualifier on conditional breakpoints as well; in this case, place
task `taskid'before the breakpoint condition (before the if).
This command allows switching to the task referred by taskno. In particular, this allows browsing of the backtrace of the specified task. It is advisable to switch back to the original task before continuing execution otherwise the scheduling of the program may be perturbed.
For more detailed information on the tasking support, see Debugging with GDB.