Re: [RFA/doco] Document task-specific breakpoints

Joel Brobecker
2009-03-25T22:02:51Z

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[with the right patch, sorry]

Hello,

As promised when I sent the code patches for task-specific breakpoints,
here is the associated documentation.

2009-03-25 Joel Brobecker <brobecker@adacore.com>

* gdb.texinfo (Ada Tasks): Add documentation about task-specific
breakpoints.

OK to commit?

--
Joel

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commit a786896e6559c568c3afea276bdc240ca8814dae
Author: Joel Brobecker <brobecker@adacore.com>
Date: Wed Mar 25 14:42:30 2009 -0700

* gdb.texinfo (Ada Tasks): Add documentation about task-specific
breakpoints.

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 134919d..92b4609 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -11743,6 +11743,59 @@ from the current task to the given task.
#4 0x804aacc in un () at un.adb:5
@end smallexample

+@item break @var{linespec} task @var{taskno}
+@itemx break @var{linespec} task @var{taskno} if @dots{}
+@cindex breakpoints and tasks
+@cindex task breakpoints
+@kindex break @dots{} task @var{taskno}
+These commands are like the @code{break @dots{} thread @dots{}}
+command (@pxref{Thread Stops}).
+@var{linespec} specifies source lines, as described
+in @ref{Set Breaks,,Setting breakpoints}.
+
+Use the qualifier @samp{task @var{taskno}} with a breakpoint command
+to specify that you only want @value{GDBN} to stop the program when a
+particular Ada task reaches this breakpoint. @var{taskno} is one of the
+numeric task identifiers assigned by @value{GDBN}, shown in the first
+column of the @samp{info tasks} display.
+
+If you do not specify @samp{task @var{taskno}} when you set a
+breakpoint, the breakpoint applies to @emph{all} tasks of your
+program.
+
+You can use the @code{task} qualifier on conditional breakpoints as
+well; in this case, place @samp{task @var{taskno}} before the
+breakpoint condition (before the @code{if}).
+
+For example,
+
+@smallexample
+@iftex
+@leftskip=0.5cm
+@end iftex
+(@value{GDBP}) info tasks
+ ID TID P-ID Pri State Name
+ 1 140022020 0 15 Child Activation Wait main_task
+ 2 140045060 1 15 Accept/Select Wait t2
+ 3 140044840 1 15 Runnable t1
+* 4 140056040 1 15 Running t3
+(@value{GDBP}) b 15 task 2
+Breakpoint 5 at 0x120044cb0: file test_task_debug.adb, line 15.
+(@value{GDBP}) cont
+Continuing.
+task # 1 running
+task # 2 running
+
+Breakpoint 5, test_task_debug.tB.1 (_task=0x11ffffc60)
+ at test_task_debug.adb:15
+15 flush;
+(@value{GDBP}) info tasks
+ ID TID P-ID Pri State Name
+ 1 140022020 0 15 Child Activation Wait main_task
+* 2 140045060 1 15 Running t2
+ 3 140044840 1 15 Runnable t1
+ 4 140056040 1 15 Delay Sleep t3
+@end smallexample
@end table

@node Ada Tasks and Core Files