Fix crash due to concurrent access in MidiController #13980
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Such threading issues require a longer testing period, than we have until 2.5.0. |
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This fixes #13940
The fix is implemented by locks around m_pMapping and reference counting.
The locks are either a mutex or a spin lock depending on the compiler support.
I have applied them everywhere, because it is not obvious which threads are readers and writers.
There is potential for further refactoring, because the Mapping is finally no longer shared when used. This is however out of scope of this band aid PR.