Remove mutex from Inject and introduce ThreadSafeInject
#30750
Merged
+150
−175
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99% of all Inject instances are accessed from one thread only, so no mutex is necessary at all.
For the few cases where a thread-safe Inject is necessary, this introduces
ThreadSafeInject, which has its own mutex, rather than a global static one, which (I think) is better for performance, and avoids the need for a recursive mutex.Closes #23805, which was never merged because we were not convinced enough of the practical need for it.