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libonyx's garbage collector uses the thd
class to suspend and resume all other threads during the mark phase of atomic
collection. For this to work, all threads that have any contact with
libonyx must be created as suspendible threads using the
thd class.
This can cause integration headaches for existing threaded applications, but
there is no other portable way to suspend and resume threads. The only
alternative is to assure that only one thread is executing in the interpreter
and to disable timeout-based (asynchronous) collection.
Jason Evans
2003-04-05