Mail Archives: cygwin/2007/01/07/05:58:58
On Jan 6 07:45, Christopher Layne wrote:
> (warning a bunch of strace, scroll wide).
>
> So I haven't been able to totally nail anything down on this issue due
> to the incredible complexity of Cygwin's mmap interface.
Lots of comments throughout the file...
> This is 2 simple mmap()s in succession, 1st is 46121 bytes, 2nd is 111 bytes.
> Both opened read/write. The second mmap always fails. This is the current
> snapshot code.
>
> In the 2nd strace, I changed the mmap logic to stop trying to align the 1st
> map on a 4k granularity boundary and just allocate a single map w/ 64k of
> left over dead space (what I would typically expect in posix land). I also
> added more debug info at various stages to try and figure things out. When
> changing it to use 64k period, the mmaps are both successful - which is good,
> but VirtualProtect always fails, no matter what, on unmap.
The strace is rather useless without the (hopefully very short) source
code of the (hopefully very small) testcase.
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Project Co-Leader cygwin AT cygwin DOT com
Red Hat
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