NetBSD does not implement PTHREAD_STACK_MIN as this is an optional part of POSIX, however it implements sysconf(_SC_THREAD_STACK_MIN). I think that this is inconsistent we we should pick one of the following paths: 1. Define PTHREAD_STACK_MIN as sysconf(_SC_THREAD_STACK_MIN). 2. Drop _SC_THREAD_STACK_MIN from sysconf(3). Independently we could tune SC_THREAD_STACK_MIN to return something larger than PAGE_SIZE if we find it needed. There were debates that a single page might not be sufficient. There is also a similar constant MINSIGSTKSZ (8192 bytes).
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