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* [Bug 1001679] New: Cyg_Counter::add_alarm() can trash list w/ immediate triggers
@ 2012-09-28 17:03 bugzilla-daemon
  2012-09-28 17:06 ` [Bug 1001679] " bugzilla-daemon
  0 siblings, 1 reply; 3+ messages in thread
From: bugzilla-daemon @ 2012-09-28 17:03 UTC (permalink / raw)
  To: ecos-bugs

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001679

           Summary: Cyg_Counter::add_alarm() can trash list w/ immediate
                    triggers
           Product: eCos
           Version: 3.0
          Platform: All
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: normal
          Priority: low
         Component: Kernel
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: meerjulien@gmail.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Created an attachment (id=1946)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1946)
Failing test case

When calling cyg_alarm_initialize with a trigger time in the past,
Cyg_Counter::add_alarm will first mark the alarm (A) as enabled before
dispatching it (B) & finally marking it as disabled (C).

Also Cyg_Counter::initialize will call rem_alarm if an alarm is enabled (D).

Hence a sequence where a callback re-enables the triggered alarm can result in
trashing the alarm list.

[begin snippet]
void Cyg_Counter::add_alarm( Cyg_Alarm *alarm )
{
    alarm->enabled = true;                     // A

    if( alarm->trigger <= counter )
    {
        alarm->alarm(alarm, alarm->data);      // B

        if( alarm->interval != 0 && alarm->enabled )
        {
            alarm->trigger += alarm->interval;
            alarm->synchronize();
        }
        else
        {
            alarm->enabled = false;            // C
            return;
        }
[end snippet]

[begin snippet]
void Cyg_Alarm::initialize(                
    cyg_tick_count    t,                // Absolute trigger time
    cyg_tick_count    i                 // Relative retrigger interval
    )
{
    Cyg_Scheduler::lock();
    if( enabled ) counter->rem_alarm(this);   // D
[end snippet]

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^ permalink raw reply	[flat|nested] 3+ messages in thread

* [Bug 1001679] Cyg_Counter::add_alarm() can trash list w/ immediate triggers
  2012-09-28 17:03 [Bug 1001679] New: Cyg_Counter::add_alarm() can trash list w/ immediate triggers bugzilla-daemon
@ 2012-09-28 17:06 ` bugzilla-daemon
  0 siblings, 0 replies; 3+ messages in thread
From: bugzilla-daemon @ 2012-09-28 17:06 UTC (permalink / raw)
  To: ecos-bugs

Please do not reply to this email. Use the web interface provided at:
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001679

--- Comment #1 from meerjulien@gmail.com 2012-09-28 18:06:33 BST ---
Created an attachment (id=1947)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1947)
Proposed corrective patch

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* [Bug 1001679] Cyg_Counter::add_alarm() can trash list w/ immediate triggers
  2012-09-28 17:03 [Bug 1001679] New: " bugzilla-daemon
@ 2012-09-28 17:06 ` bugzilla-daemon
  0 siblings, 0 replies; 3+ messages in thread
From: bugzilla-daemon @ 2012-09-28 17:06 UTC (permalink / raw)
  To: unassigned

Please do not reply to this email. Use the web interface provided at:
http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001679

--- Comment #1 from meerjulien@gmail.com 2012-09-28 18:06:33 BST ---
Created an attachment (id=1947)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id=1947)
Proposed corrective patch

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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2012-09-28 17:06 UTC | newest]

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