C++11 threads: notify_all() or notify_one() when I only have one?

Question

My threads operate as a linked list(with overlap, hence threads), implementing something not dissimilar to a timeline. Each condition variable unlocks the next thread in the linked list.

Should I use notify_all() or notify_one() when I have only one to notify?

Answer 1

Use notify_one unless your code makes it easier to read notify_all (for example you've constructed a list which just happens to have one element in it).