id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
11873	boost::filesystem does not work on windows when multiple processes access the same junction (directory)	stsoe <stsoe@…>	Beman Dawes	"Hi,

I just upgraded to boost_1_60_0 ran into a regression on windows only, which I think is related to issue 9016. My windows tests are failing sporadically with the error:


{{{
boost::filesystem::read_symlink: The process cannot access the file because it is being used by another process: ""r:/data""
}}}


Debugging this by comparing 1_60_0 to the earlier 1_56_0 I finally narrowed the difference to {{{operations.cpp: bool is_reparse_point_a_symlink}}}, which returns true in 1_60_0 but false in 1_56_0. The return value triggers {{{canonical}}} to call {{{detail::read_symlink}}}, which in turn ends up calling {{{::CreateFileW}}} with {{{dwShareMode}}} set to 0 so that the file/directory is locked and cannot be opened by another process.

I am running my tests on LSF and many many processes end up accessing the same file / directory at the same time, thus leading the the above error message.

I have not debugged enough to be able to suggest a fix or a work-around, but this bug currently prevents me from upgrading to boost_1_60_0.  I am thinking that I can maybe revert the change to {{{is_reparse_point_a_symlink}}} in my installation so I can proceed with the upgrade, but I am worried that other changes have been made that depend on the current behavior.

Thanks,

Soren Soe
"	Bugs	new	To Be Determined	filesystem	Boost 1.64.0	Regression		symlink, junction, windows