Add basic thread safety

[blastrock]

Description

I added basic thread-safety to doctest to be able to do assertions in multiple threads. It only works with C++11 support though.

I ran some tests with clang's thread sanitizer to make sure there are no more races.

GitHub Issues

Closes #4

[onqtam]

Hello and thanks for the effort - I see the original issue was opened by you so this must be pretty important!

Thanks for this baseline - I'm gonna take a look at it in the next couple of weeks (hopefully) - I'm still knee-deep with other work and cannot commit a few days/weeks for a new version.

I was planning on refactoring most of the internals of the framework in order to add support for reporters and then to look at thread safety, but that order may change.

I won't merge it instantly, but this will most likely go into version 1.3 :)

[blastrock]

No problem :)

Reporters may be hard to do threadsafe, but I think you can just mutex them for a start and see later how to avoid locks. I may be able to help there :)

[onqtam]

not sure why I closed this - It will go in (one way or another) - but I'll have to postpone it with at least 1 more month...

[onqtam]

I did some refactoring before merging this. Now it has conflicts. I will either try to resolve them or re-do the changes again. I was also planning on changing it a bit - sorry if I don't end up merging this (but its a good starting point!) - but at least thread safety is coming in 1.3 which I plan on releasing in the next month :)

[blastrock]

No problem, I'm more interested in getting the feature than in merging this ;)

[onqtam]

apparently deleting the dev branch resulted in closing this PR. I'm publishing version 1.2.9 now and in the next weeks will be working on 1.3 with this (in some form) in it!

[onqtam]

FYI I'll soon be working on this - I've rewritten the guts of doctest and have moved to streams for the reporting - I've also made a reporter interface which can be used by users to register alternative reporters (no documentation yet).

I also decided to switch to C++11 features and doctest is currently 5100 lines of code compared to 5700 for version 1.2.8 - lots of code got removed, but sadly GCC 4.4, 4.5 and 4.6 will no longer be supported (also Visual Studio 2008/2010/2012).....

At least now I can straight up include <thread> - no more conditional compilation!

So this will get into version 2.0 but still I cannot promise a date - hopefully within the next month... This is going to be the biggest release since 1.0 !

[onqtam]

I just pushed the thread safety support in commit 60e8a45 in the dev branch! TODO: the logging facilities. I'm closing this but thanks again for this PR and showing me how easy this was!

I will not promise a release date however... but the work I have left for version 2.0 isn't much - all I have to do is implement an xml reporter with the new IReporter interface - but I should research xml encoding and other non-interesting things... :D

[blastrock]

Great! Thank you! And good luck with XML :)