[Boost-bugs] [Boost C++ Libraries] #3572: mapped_file: reading/writing mapped memory can throw (structured) exceptions? (windows)

Subject: [Boost-bugs] [Boost C++ Libraries] #3572: mapped_file: reading/writing mapped memory can throw (structured) exceptions? (windows)
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-10-28 11:48:59

#3572: mapped_file: reading/writing mapped memory can throw (structured)
exceptions? (windows)
----------------------------------------+-----------------------------------
 Reporter:  xurux1-mail@…               |       Owner:  turkanis 
     Type:  Bugs                        |      Status:  new      
Milestone:  Boost 1.41.0                |   Component:  iostreams
  Version:  Boost 1.40.0                |    Severity:  Problem  
 Keywords:  mapped_file, documentation  |  
----------------------------------------+-----------------------------------
 msdn: "Reading and Writing From a File View"
 (http://msdn.microsoft.com/en-us/library/aa366801(VS.85).aspx)

 "Reading from or writing to a file view can cause an
 EXCEPTION_IN_PAGE_ERROR exception.
 For example, accessing a mapped file that resides on a remote server can
 generate an exception
 if the connection to the server is lost. Exceptions can also occur because
 of a full disk, an
 underlying device failure, or a memory allocation failure. When writing to
 a file view, exceptions
 can also occur because the file is shared and a different process has
 locked a byte range. To guard
 against exceptions due to input and output (I/O) errors, all attempts to
 access memory mapped files
 should be wrapped in structured exception handlers"

   DWORD dwLength;
   __try
   {
     dwLength = *((LPDWORD) lpMapAddress);
   }
   __except(GetExceptionCode()==EXCEPTION_IN_PAGE_ERROR ?
     EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)
   {
     // Failed to read from the view.
   }

 ... so it should be mentioned in the documentation?
 (windows specific)

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3572>
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