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On 01/11/2011 04:13 AM, jdzstz - gmail dot com wrote: > Testing a linux application that uses "madvise", varnish cache, I have > realized that in cygwin doesnot exists this function but exists the > alternative "posix_madvise". > > Adding inside configure.ac script: > + AC_DEFINE([madvise], [posix_madvise], [In CYGWIN, madvise function > is not defined, instead we use posix_madvise]) > + AC_DEFINE([MADV_RANDOM], [POSIX_MADV_RANDOM], [In CYGWIN, > MADV_RANDOM define is not defined, instead we use POSIX_MADV_RANDOM]) madvise is more powerful than posix_madvise; while this workaround may have let you get varnish working, it is not a panacea for all clients of madvise. You are better off filing a bug report against varnish that they should either use the POSIX interface, or add a configure-time check for the presence of madvise. > I think it could be interesting adding this defines to cygwin headers, > at the end of <sys/mman.h> file > > #define madvise posix_madvise > #define MADV_NORMAL POSIX_MADV_NORMAL > #define MADV_SEQUENTIAL POSIX_MADV_SEQUENTIAL > #define MADV_RANDOM POSIX_MADV_RANDOM > #define MADV_WILLNEED POSIX_MADV_WILLNEED > #define MADV_DONTNEED POSIX_MADV_DONTNEED While these defines may make sense _once madvise is implemented_ in cygwin, I don't want them any sooner. In other words, we need a cygwin port of madvise before we pollute the namespace with MADV_* constants. That said, since Linux supports madvise and cygwin tries to emulate Linux, a patch to implement madvise() is more than welcome. -- Eric Blake eblake@redhat.com +1-801-349-2682 Libvirt virtualization library http://libvirt.org
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