Commits on Feb 28, 2020

1. Make sqlite3.Open thread safe …

   * sqlite3_open_v2 implicitly calls sqlite3_initialize
   * sqlite3_initialize is not thread safe in the prologue
   * concurrent calls of sqlite3.Open even on different files
     may trigger mutex initialization race and crash
   * Fix: use go channel with a single message in it as a barrier
     letting only single-threaded sqlite3_open_v2 for the first time
   * Reproducibility: very low, couple hours of concurrent sqlite3.Open calls
     trigger a single crash

   

   algorandskiy committed Feb 28, 2020
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