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

From: Ion Gaztañaga (igaztanaga_at_[hidden])
Date: 2008-09-01 11:44:56

Boris wrote:
>> -> Using named pipes has been problematic because it returns errors 
>> when launching multiple processes aggressively: Error 231 - All Pipes 
>> are Busy. This does not happen with anonymous pipes and I think it has 
>> some relationship with the guid code. By the way, I think a uuid 
>> library is too much to create a unique identifier to be shared with 
>> the child a simple atomic count would to the job in my opinion. That 
>> would reduce Boost.Process dependencies.
> 
> An atomic count might not be sufficient as it would be unique only per 
> process. As I used Boost.Uuid only for convenience though I'll replace 
> it with an atomic count plus a random number to drop the dependency.

The PID of the parent plus an atomic count wouldn't be enough?

>> -> systembuf::close() should call sync() to push the last charaters 
>> into the pipe, othewise, characters are lost if the user does not 
>> flush the stream.
> 
> Changed (in postream::close()).

I think we must change this in systembuf, because a user might use the 
streambuf directly and it would be surprised to see that unlike 
std::filebuf, already written characters are missed.

Regards,

Ion