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* fhandler_disk_file.cc (fhandler_disk_file::pread): Skip to non-atomic

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code if mandatory locking is used on this descriptor.  Explain why.
	(fhandler_disk_file::pwrite): Ditto.
	* posix.sgml (std-notes): Extend description of file locking.
This commit is contained in:
Corinna Vinschen
2013-06-07 08:28:25 +00:00
parent fc316f3a8e
commit 000e74dfd5
3 changed files with 37 additions and 6 deletions
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10
winsup/cygwin/fhandler_disk_file.cc
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@ -1575,8 +1575,9 @@ fhandler_disk_file::pread (void *buf, size_t count, off_t offset)
return -1;
}
/* In binary mode, we can use an atomic NtReadFile call. */
if (rbinary ())
/* In binary mode, we can use an atomic NtReadFile call.
Windows mandatory locking semantics disallow to use another HANDLE. */
if (rbinary () && !mandatory_locking ())
{
extern int __stdcall is_at_eof (HANDLE h);
NTSTATUS status;
@ -1647,8 +1648,9 @@ fhandler_disk_file::pwrite (void *buf, size_t count, off_t offset)
return -1;
}
/* In binary mode, we can use an atomic NtWriteFile call. */
if (wbinary ())
/* In binary mode, we can use an atomic NtWriteFile call.
Windows mandatory locking semantics disallow to use another HANDLE. */
if (wbinary () && !mandatory_locking ())
{
NTSTATUS status;
IO_STATUS_BLOCK io;