Re: [Boost-bugs] [Boost C++ Libraries] #9792: named_mutex is not process Persistence by default in windows

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9792: named_mutex is not process Persistence by default in windows
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2014-03-19 10:07:53

#9792: named_mutex is not process Persistence by default in windows
-------------------------------+--------------------------
  Reporter:  huyuguang@…       |      Owner:  igaztanaga
      Type:  Bugs              |     Status:  new
 Milestone:  To Be Determined  |  Component:  interprocess
   Version:  Boost 1.55.0      |   Severity:  Problem
Resolution:                    |   Keywords:
-------------------------------+--------------------------

Comment (by huyuguang@…):

 I am so sorry, the named_mutex is kernel/filesystem persistence and the
 interprocess_mutex is process persistence.

 So how can I get a named mutex which is process persistence?

 What I need is I need to know if current process is the first process so
 that it can create a managed_shared_memory. Since the
 managed_shared_memory is kernel/filesystem persistence, if the processes
 crash, the file would still exist in folder.
 So I want to use a process persistence named mutex to avoid this, the code
 looks like:
 bool init() {
         mutex1 = create_mutex("mutex1");
         if (!mutex1) {
                 mutex1 = open_mutex("mutex1");
                 if (!mutex1)
                         return false;
                 managed_shared_memory segment(open_only,"mem1");
         } else {
                 shared_memory_object::remove("mem1");
                 managed_shared_memory segment(create_only,"mem1");
         }
         return true;
 }

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9792#comment:1>
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