Which threads execute _Thread_Handler ?

[Richi Dubey]

Thanks for your replies.

Great suggestion about setting up a breakpoint at _Thread_Handler. After
setting the breakpoint, the code run by Strong_APA does not break, whereas
the default scheduler's code does break:


------------------------
Default Scheduler (That executes correctly without error):

Thread 1 hit Breakpoint 7, Tasks (argument=0) at
/home/richi/quick-start/src/rtems/c/src/../../testsuites/tmtests/tm24/task1.c:110
110  Task_count++;
(gdb) b _Thread_Handler
Breakpoint 8 at 0x10a67e: file
/home/richi/quick-start/src/rtems/c/src/../../cpukit/score/src/threadhandler.c,
line 88.
(gdb) c
Continuing.

Thread 1 hit Breakpoint 8, _Thread_Handler () at
/home/richi/quick-start/src/rtems/c/src/../../cpukit/score/src/threadhandler.c:88
88  executing = _Thread_Executing;
(gdb)
Continuing.

Thread 1 hit Breakpoint 7, Tasks (argument=0) at
/home/richi/quick-start/src/rtems/c/src/../../testsuites/tmtests/tm24/task1.c:110
110  Task_count++;
------------------------

Strong APA execution (The execution that fails/give error):
------------------------
Thread 1 hit Breakpoint 7, Tasks (argument=0) at
/home/richi/quick-start/src/rtems/c/src/../../testsuites/tmtests/tm24/task1.c:110
110  Task_count++;
(gdb) b _Thread_Handler
Breakpoint 8 at 0x1086b2: file
/home/richi/quick-start/src/rtems/c/src/../../cpukit/score/src/threadhandler.c,
line 88.
(gdb) c
Continuing.

Thread 1 hit Breakpoint 5, _Terminate

------------------------

I am going to investigate the scheduler's role in this.

Thanks,
Richi.

On Mon, Dec 7, 2020 at 11:09 AM Sebastian Huber <
sebastian.huber at embedded-brains.de> wrote:

> On 05/12/2020 07:13, Richi Dubey wrote:
>
> >
> > The stack trace for the thread looks like this:
> >
> > Tasks (entry function) -> rtems_task_wake_after
> > ->_Thread_Dispatch_direct -> _Thread_Do_dispatch (where the
> > _Context_switch function call lies), how can then the heir thread
> > start executing from the _Thread_Handler? I do not see it in the trace
> > at all.
> The context of new threads is set up by _Thread_Load_environment().
>
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