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Typesafe Signal-Slot library making use of variadic templates
Here library calls foreign callbacks under mutex lock:
void emit(T ...t) {
LockBlock lock(this);
for(auto &connection: SignalBase<T...>::m_connected_slots) {
connection->emit(t...);
}
}
Imagine that one thread connects to "signal1" own function "slot1" which fires "signal2". First, it locks "signal1" mutex, then attempts to lock "signal2" mutex.
Another thread connects to "signal2" own function "slot2" which fires "signal1". First, it locks "signal2" mutex, then attempts to lock "signal1" mutex.
In some cases, threads will enter into deadlock: thread1 always waits "signal2" mutex, while thread2 always waits "signal1" mutex.
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