sonic-pi

https://github.com/sonic-pi-net/sonic-pi

C++

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ThreadSafe::Util::Adder#sum

Returns the current sum.  The returned value is _NOT_ an
atomic snapshot: Invocation in the absence of concurrent
updates returns an accurate result, but concurrent updates that
occur while the sum is being calculated might not be
incorporated.

Source | Google | Stack overflow

Edit

git clone [email protected]:sonic-pi-net/sonic-pi.git

cd sonic-pi

open app/server/ruby/vendor/thread_safe/lib/thread_safe/util/adder.rb

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-ThreadSafe--Util--Adder-sum-for-pr

# Commit to git

git add app/server/ruby/vendor/thread_safe/lib/thread_safe/util/adder.rbgit commit -m "better docs for ThreadSafe::Util::Adder#sum"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-ThreadSafe--Util--Adder-sum-for-pr

hub pull-request

# Celebrate!