Fix crash when calling pthread_mutex_lock on the main thread #5243
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Related to #5038,
robust_list.head
was being set properly for new threads but wasn't being set for the main thread so the error persisted.I have copied the relevant code into
initMainThreadBlock
and I have moved the pthread_mutex_(un)lock calls out of the if block as they should be tested (and work) regardless of the browser's threading support.