Re[42]: [Gc]: GC + Windows Mobile + Threads + Patch for WINCE

Ivan Maidanski ivmai at
Sun Oct 25 09:28:38 PST 2009

Zeyi Lee <biosli at> wrote:
> Hi,
> I checkout the latest version of Boehm-GC(last changed date 2009-10-23).
> Added GC_THREADS and VERY_SMALL_CONFIG, output as below:
> ----------------------------
> Received WM_CLOSE, closing window
> ...
> Collector appears to work
> ----------------------------


> I test the version with several case on my WINCE box, as following:
> Case 1:
> I got a Data Abort as below:
> -------------------
> Data Abort: Thread=8efce000 Proc=8c398520 'test_libgcd_Wince.exe'
> AKY=00040001 PC=0001a9d4(test_libgcd_Wince.exe+0x0000a9d4) RA=0001a1e4(test_libgcd_Wince.exe+0x0000a1e4) BVA=2787fc0c FSR=00000007
> -------------------
> Then the program runs to the end.
> ...
> Collector appears to work
> ------------------------

The situation is unclear to me.

1. Could you tell me the bscktrace?

2. Could you tell me the contents of verInfo in GC_setpagesize() (after calling GetVersionEx)?

3. Does Data Abort also occur without -DMAKE_BACK_GRAPH?

> Case 2:
> I defined MAKE_BACK_GRAPH, VERY_SMALL_CONFIG, stack = 65536, and retest, then I got a Debugbreak.
> -----------------
> Collecting from unknown thread.
> -----------------
> The Case 2 I runs in Win32, I got the same DebugBreak.
> I send the two backtrace files as attachment.

This is unclear too.

The backtraces say the thread is called from GC_win32_start_inner() which should also register the thread, so either the thread is unregistered somewhere or thread->id is trashed somewhere. Could you compile it for Win32 adding also -DGC_PRINT_VERBOSE_STATS -DDEBUG_THREADS and tell me the contents of the log file after the last "Initiating full world-stop collection!" line?


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