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(pthread_attr_getstackaddr): Export. (pthread_getattr_np): Export. * ntdll.h (enum _THREAD_INFORMATION_CLASS): Add ThreadBasicInformation. (struct _THREAD_BASIC_INFORMATION): Define. (NtQueryInformationThread): Declare. * posix.sgml (std-susv4): Add pthread_attr_getstack. (std-gnu): Add pthread_getattr_np. (std-deprec): Add pthread_attr_getstackaddr. (std-notimpl): Remove pthread_attr_[gs]etstackaddr, as they were removed from SUSv4. * thread.cc (pthread_attr::pthread_attr): Initialize stackaddr. (pthread_attr_getstack): New function. (pthread_attr_getstackaddr): New function. (pthread_attr_setstacksize): Return EINVAL if passed size less than PTHREAD_STACK_MIN, as required by POSIX. (pthread_getattr_np): New function. * thread.h (class pthread_attr): Add stackaddr member. * include/pthread.h (pthread_attr_getstack): Declare. (pthread_attr_getstackaddr): Declare unconditionally. (pthread_attr_setstack): Declare inside false conditional for reference. (pthread_getattr_np): Declare. * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.
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