(CygwinCreateThread): Simplify code by assuming that now stack-related input values are undefined. Set stack protection to PAGE_READWRITE, as is default on Windows. Add lengthy comment to explain POSIX guardpage. * thread.cc (pthread_attr::pthread_attr): Initialize stacksize as PTHREAD_DEFAULT_STACKSIZE. Initialize guardsize as PTHREAD_DEFAULT_GUARDSIZE. * thread.h (PTHREAD_DEFAULT_STACKSIZE): Define. Add comment to explain. (PTHREAD_DEFAULT_GUARDSIZE): Define.
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