180. Static Memory

Question.11

A singleton uses a static local for lazy initialization:

class Logger {
public:
   static Logger& instance() {
       static Logger log;  // Constructed on first call
       return log;
   }
private:
   Logger() { uart_init(115200); }
};

Is the construction of log thread-safe in C++11?

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No -- static locals are never thread-safe
Yes -- C++11 guarantees that static local initialization is thread-safe; the compiler inserts hidden synchronization to ensure the object is constructed exactly once
Only if the Logger constructor is trivial
Depends on the OS

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