The thread ID is an unsigned long so it can hold pthread_t so people can do naughty things with it.
I'm going to be adding additional useful thread API functions, but this should prevent crashes in people's existing code on 64-bit architectures.
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%404327
Port SDL 1.3 to the Nintendo DS
by Darren Alton, mentored by Sam Lantinga
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extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%403188