Re: [boost] [interprocess][process] Synchronizing libraries and efforts (+ bugs)

From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2008-09-01 14:39:21

Boris wrote:
> On Mon, 01 Sep 2008 17:52:52 +0200, Ion Gaztañaga <igaztanaga_at_[hidden]> 
> wrote:
>> [...]I don't have much idea about async I/O but we can try to write 
>> something once we know what we need. I might be completly wrong but 
>> boost::interprocess::shared_memory_object is based on a file 
>> descriptor (shm_open in unix and a plan file on windows) so we can 
>> just obtain the handle and see if select() and WaitForMultipleObject() 
>> work on them. After all, write() should work on UNIX with a shared 
>> memory object descritor.
> 
> Hm, sounds like a good idea. Is there any method I could call to access 
> the file descriptor and handle? Then I could try and use the same 
> Boost.Asio I/O objects as above to check if the idea basically works.

Not yet ;-) But you can just take shared_memory_object class and modify 
it adding a function called get_os_handle():

class shared_memory_object
{
    private:
    file_handle_t  m_handle;
    mode_t         m_mode;
    std::string    m_filename;

    //...

    public:
    file_handle_t get_os_handle() const
    { return m_handle;  }
}

file_handle_t is an int in UNIX and void * (HANDLE) in windows. I think 
that's all we need.

> Boris

Regards,

Ion