path: root/Makefile
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authorRich Felker <>2013-07-31 15:19:39 -0400
committerRich Felker <>2013-07-31 15:19:39 -0400
commit5db951ef80cae8b627f95b995811bf916c069757 (patch)
treea5835c1d42d0be770f6cf8b96b6221fc733d499a /Makefile
parent27593d3a357073cfd24e6b09e207b8c742cd2dd7 (diff)
in pthread_getattr_np, use mremap rather than madvise to measure stack
the original motivation for this patch was that qemu (and possibly other syscall emulators) nop out madvise, resulting in an infinite loop. however, there is another benefit to this change: madvise may actually undo an explicit madvise the application intended for its stack, whereas the mremap operation is a true nop. the logic here is that mremap must fail if it cannot resize the mapping in-place, and the caller knows that it cannot resize in-place because it knows the next page of virtual memory is already occupied.
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