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* mmap.cc (handler_disk_file::msync): Retry up to 99 times if FlushViewOFile

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fails with ERROR_LOCK_VIOLATION.
This commit is contained in:
Christopher Faylor
2013-01-18 00:28:21 +00:00
parent 5988aa6e3f
commit c5eb7a4971
2 changed files with 21 additions and 7 deletions
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5
winsup/cygwin/ChangeLog
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@@ -1,3 +1,8 @@
2013-01-17 Christopher Faylor <me.cygwin2013@cgf.cx>
* mmap.cc (handler_disk_file::msync): Retry up to 99 times if
FlushViewOFile fails with ERROR_LOCK_VIOLATION.
2013-01-16 Christopher Faylor <me.cygwin2013@cgf.cx>
* sigproc.cc (no_signals_available): Finally remove this macro

19
winsup/cygwin/mmap.cc
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@@ -1,7 +1,7 @@
/* mmap.cc
Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007, 2008, 2009, 2010, 2011 Red Hat, Inc.
2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.
This file is part of Cygwin.
@@ -1657,13 +1657,22 @@ fhandler_disk_file::munmap (HANDLE h, caddr_t addr, size_t len)
int
fhandler_disk_file::msync (HANDLE h, caddr_t addr, size_t len, int flags)
{
if (FlushViewOfFile (addr, len) == 0)
{
const int retry = 100;
/* The wisdom of google tells us that FlushViewOfFile may fail with
ERROR_LOCK_VIOLATION if "if the memory system is writing dirty
pages to disk". And, we've seen reports of this happening in the
cygwin list. So retry 99 times and hope we get lucky. */
for (int i = 0; i < retry; i++)
if (FlushViewOfFile (addr, len))
return 0;
else if (GetLastError () != ERROR_LOCK_VIOLATION)
break;
else if (i < (retry - 1))
yield ();
__seterrno ();
return -1;
}
return 0;
}
bool
fhandler_disk_file::fixup_mmap_after_fork (HANDLE h, int prot, int flags,