Code AnalysisIntermediate 60s

Self-deadlock from locking a non-recursive mutex twice

What happens when this program runs?

Starter code

#include <mutex>
std::mutex m;

void a() { std::lock_guard<std::mutex> g(m); b(); }
void b() { std::lock_guard<std::mutex> g(m); }

int main() { a(); }

deadlock mutex concurrency

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