[Boost-users] Condition variable and const-correctness

It strikes me as odd that waiting on a condition variable is not const. It seems to me that, although one does expect the condition variable to change state, one is not actually requesting the change, but instead is merely detecting a change made by another thread. I can understand that, internally, the condition variable is probably keeping lists of waiting threads, which would need to be modified in order to satisfy the wait() call. From the point of view of the calling code, however, I think that this is irrelevant. Is there some other sense in which calling wait() can be considered to modify the condition variable? Weston Markham