[erlang-questions] OS X Trace/BPT trap error loading linked in driver

David Rowe <>
Wed Apr 7 15:32:20 CEST 2010


But does it though? I can't tell: I'm using 64-bit Snow Leopard, so I get
"Can not combine 64bits erlang with wxWidgets on MacOSX" when I compile
R13B04.

I might well be wrong, but if I'm right I can't see anyway around that
pthread_main_np() call. It will always return 0, because Erlang will always
load a linked-in driver on a thread other than the main thread, won't it?

David




On 06/04/2010 23:40, "Dan Gudmundsson" <> wrote:

> It should work anyway, it does for wx, see how I initialize the graphics in
> wx.
> It complains but it works.
> 
> /Dan
> 
> On Tue, Apr 6, 2010 at 7:11 PM, David Rowe <> wrote:
>> I am writing a linked-in driver on OS X. The driver relies on some of the OS
>> X API "framework" libraries. The problem is that when I call
>> erl_ddll:load_driver, there is a Trace/BPT trap error and everything dies.
>> 
>> If I look at the crash report in Console I see this:
>> 
>> Exception Type:  EXC_BREAKPOINT (SIGTRAP)
>> Exception Codes: 0x0000000000000002, 0x0000000000000000
>> Crashed Thread:  5
>> 
>> Thread 5 Crashed:
>> 0   com.apple.CoreFoundation          0x00007fff867811c0 __CFInitialize +
>> 1808
>> 1   dyld                              0x00007fff5fc0d5ce
>> ImageLoaderMachO::doImageInit(ImageLoader::LinkContext const&) + 138
>> 2   dyld                              0x00007fff5fc0d607
>> ImageLoaderMachO::doInitialization(ImageLoader::LinkContext const&) + 27
>> 3   dyld                              0x00007fff5fc0bcec
>> ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&,
>> unsigned int) + 236
>> 4   dyld                              0x00007fff5fc0bc9d
>> ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&,
>> unsigned int) + 157
>> 5   dyld                              0x00007fff5fc0bc9d
>> ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&,
>> unsigned int) + 157
>> 6   dyld                              0x00007fff5fc0bc9d
>> ImageLoader::recursiveInitialization(ImageLoader::LinkContext const&,
>> unsigned int) + 157
>> 7   dyld                              0x00007fff5fc0bda6
>> ImageLoader::runInitializers(ImageLoader::LinkContext const&) + 58
>> 8   dyld                              0x00007fff5fc08fbb dlopen + 573
>> 9   libSystem.B.dylib                 0x00007fff831a7720 dlopen + 61
>> 10  beam.smp                          0x000000001011c4ef
>> erts_sys_ddll_open_noext + 47 (erl_unix_sys_ddll.c:129)
>> 
>> 
>> I'm pretty sure that the Exception is being caused by this line in the
>> __CFInitialize function:
>> 
>> if (!pthread_main_np()) HALT;    // CoreFoundation must be initialized on
>> the main thread
>> 
>> 
>> So my question is, does anyone know how to get Erlang to load my driver on
>> its main thread? Or is there any kind of workaround? The only options I can
>> see at the moment are rewriting the driver as a "c node" (possibly too slow)
>> or moving to LinuxŠ
>> 
>> Thanks,
>> 
>> David Rowe
>> 
> 
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