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* RFC: bsd_tcpip patch on synch.c
@ 2013-06-27  9:34 Lambrecht Jürgen
       [not found] ` <DUB124-W44EE5E989F221552E035FDE4750@phx.gbl>
  0 siblings, 1 reply; 4+ messages in thread
From: Lambrecht Jürgen @ 2013-06-27  9:34 UTC (permalink / raw)
  To: ecos-devel; +Cc: Bernd Edlinger

Hello,

The patch below we already use since 2009. But I did not code the patch, 
so I do not know what problem it solves. Here are our CVS logs about the 
patch:

- To avoid deadlock on mutex 'splx_mutex', I changed 'cyg_mutex_lock' 
into 'cyg_mutex_trylock'.
- Add 'trylock' and 'cyg_thread_delay' to spl_any() in order to handle 
the deadlock issue on the mutex 'splx_mutex'

I am applying the patches from Bernd Edlinger 
(http://bugs.ecos.sourceware.org/show_bug.cgi?id=1001656)(to fix an 
anoying problem "packet loss every 20 minutes when ARP timeout expires" 
and to add raw packets).
And I wonder if this patch (below) is still valid?
--------------------------------------------------------------------------------
Index: net/bsd_tcpip/current/src/ecos/synch.c
===================================================================
RCS file: /cvs/ecos/ecos-opt/net/net/bsd_tcpip/current/src/ecos/synch.c,v
retrieving revision 1.3
diff -u -5 -p -r1.3 synch.c
--- net/bsd_tcpip/current/src/ecos/synch.c      29 Jan 2009 17:49:56 
-0000      1.3
+++ net/bsd_tcpip/current/src/ecos/synch.c      27 Jun 2013 09:12:54 -0000
@@ -115,12 +115,14 @@ static volatile cyg_handle_t splx_thread
  static inline cyg_uint32
  spl_any( cyg_uint32 which )
  {
      cyg_uint32 old_spl = spl_state;
      if ( cyg_thread_self() != splx_thread ) {
-        while ( !cyg_mutex_lock( &splx_mutex ) )
+        while ( !cyg_mutex_trylock( &splx_mutex ) ) {
+          cyg_thread_delay(1);
              continue;
+        }
          old_spl = 0; // Free when we unlock this context
          CYG_ASSERT( 0 == splx_thread, "Thread still owned" );
          CYG_ASSERT( 0 == spl_state, "spl still set" );
          splx_thread = cyg_thread_self();
      }
--------------------------------------------------------------------------------
Kind regards,
Jürgen

-- 
Jürgen Lambrecht
R&D Associate
Mobile: +32 499 644 531
Tel: +32 (0)51 303045    Fax: +32 (0)51 310670
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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2013-06-27 17:07 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-06-27  9:34 RFC: bsd_tcpip patch on synch.c Lambrecht Jürgen
     [not found] ` <DUB124-W44EE5E989F221552E035FDE4750@phx.gbl>
2013-06-27 12:51   ` Bernd Edlinger
2013-06-27 14:20     ` Lambrecht Jürgen
     [not found]       ` <DUB124-W17E1B3022EDF1B00BF4396E4750@phx.gbl>
2013-06-27 17:07         ` FW: " Bernd Edlinger

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