[Gc] GC_INIT? Threads?

[The Devils Jester]

I have a library that makes heavy use of of the GC, and it works quite well
when everything (the app, and the library) is in one thread.  I call
GC_INIT in the app, and all is well.

If, however, the app creates a new thread that calls the library function,
then it crashes when the GC does its magic (below I have pasted some
relevant output).

Is there some trick to using GC on a separate thread?  Do I call GC_INIT
from the main thread, or the one that calls the library functions?


0   libsystem_kernel.dylib         0x00007fff8ad14212 __pthread_kill + 10
1   libsystem_c.dylib             0x00007fff90d01b54 pthread_kill + 90
2   libsystem_c.dylib             0x00007fff90d45dce abort + 143
3   libgc.1.dylib                 0x000000010357676e GC_abort + 97
4   libgc.1.dylib                 0x000000010357b413 GC_push_all_stacks +
285
5   libgc.1.dylib                 0x000000010357396e GC_mark_some + 377
6   libgc.1.dylib                 0x000000010356d73e GC_stopped_mark + 148
7   libgc.1.dylib                 0x000000010356d645
GC_try_to_collect_inner + 245
8   libgc.1.dylib                 0x000000010356e302 GC_collect_or_expand +
147
9   libgc.1.dylib                 0x000000010356e51a GC_allocobj + 228
10  libgc.1.dylib                 0x0000000103572515
GC_generic_malloc_inner + 249
11  libgc.1.dylib                 0x00000001035725dd GC_generic_malloc + 79
12  libgc.1.dylib                 0x00000001035728c0 GC_core_malloc + 196
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