기타 :
Linux : NGPT -> NPTL
NPTL Highlights: (Red Hat 9 by default)
* O(1) scheduler, which claims to scale better.
* Signal delivery is now POSIX-compliant.
* No hard limit on the number of threads. The only limit is address space (32bit) or physical memory.
* Synchronization is done by the new futex interface within kernel.
* Faster thread creation.
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