This is the mail archive of the
cygwin@cygwin.com
mailing list for the Cygwin project.
RE: mmap of large amount returns invalid pointer
> looks like you have overlooked that mmap doesn't return NULL
> despite win32 error in strace (see below):
>
> c:\>net helpmsg 1455
>
> The paging file is too small for this operation to complete.
Thanks for pointing that out. I agree that it looks like the Cygwin
dll is failing to check for the Win32 error, which should have caused
mmap to return -1.
But even if that is fixed, I don't understand why Cygwin/mmap is
unable to obtain the memory. My earlier message showed that at the
start of the program the information returned by GlobalMemoryStatus
shows that there is easily >300Mb available.
TotalPhys: 209113088
AvailPhys: 166580224
TotalPageFile: 309587968
AvailPageFile: 275365888
TotalVirtual: 2147352576
AvailVirtual: 1589841920
I tried a modified version of the program that uses VirtualAlloc/Free
instead of mmap/munmap and it is able to allocate, zero, and free
300Mb.
--
Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
Bug reporting: http://cygwin.com/bugs.html
Documentation: http://cygwin.com/docs.html
FAQ: http://cygwin.com/faq/