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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 51360] New: Use of Windows 7 / 2008R2 SRW Locks (Slim Reader/Writer Lock) in rwlock
Date Sat, 11 Jun 2011 18:32:26 GMT

             Bug #: 51360
           Summary: Use of Windows 7 / 2008R2 SRW Locks (Slim
                    Reader/Writer Lock) in rwlock
           Product: APR
           Version: 1.4.2
          Platform: PC
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: APR
        AssignedTo: bugs@apr.apache.org
        ReportedBy: leandro.becker@gmail.com
    Classification: Unclassified

Created attachment 27150
  --> https://issues.apache.org/bugzilla/attachment.cgi?id=27150
Rwlock that uses the Windows SRW locks when OS supports.


I was wondering about using the Windows 7 and 2008 R2 SRW locks at the APR
rwlock implementation. The Windows Vista/2008 does not have the Try APIs to try
get the read/write lock, so in this case (and older OSs), the old APR method is

I made an implementation of it, but there is a restriction: The Windows SRW
lock is not reentrant, ie, the same thread cannot lock the SRW object more than

Attached is the .diff file for win32\thread_rwlock.c

I hope this patch can be useful.


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