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1a821390d1
Revert mx parameter and mutex lock while operating the list. Mutex was removed with 94d24160 informing that: 'Use InterlockedCompareExchangePointer to ensure race safeness without using a mutex.' But it does not. Calling pthread_mutex_init and pthread_mutex_destroy from two or more threads occasionally leads to hang in pthread_mutex_destroy. To not change the behaviour of other cases where List_insert was called, List_insert_nolock is added.
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