Re: [Boost-users] status of boost::signal multi-threading support

From: Doug Gregor (dgregor_at_[hidden])
Date: 2005-01-04 13:59:14

On Jan 4, 2005, at 1:25 PM, Stephen torri wrote:

> On Tue, 2005-01-04 at 13:16 -0500, Doug Gregor wrote:
>> On Jan 2, 2005, at 9:43 PM, Stephen torri wrote:
>>> What is the state of the multi-threading support for boost::signals?
>>
>> Signals does not behave well in a multi-threaded environment. Unless
>> someone else takes on the task, I don't expect it to be done for a 
>> long
>> time.
>
> What are the symptoms of this behavior?

If you're using a signal from two threads concurrently, you will most 
likely see random crashes and other bad behavior. Signals keep a lot of 
state, even when they are being invoked, so just about anything can 
trip it up.

> I am curious because, I am wondering in my ignorance, what are the
> components of the boost::signal library and how they can be 
> multi-thread
> capable. This ofcourse is answered by reviewing the code.

Ideally, a thread-safe Signals would allow you to invoke in several 
threads at one, disconnect signals in several threads concurrently, 
etc.

        Doug