How to check if sqlite3 is compiled with HAVE_USLEEP

Qter

https://stackoverflow.com/questi ... ed-with-have-usleep

  // if SQlite was STILL not built with HAVE_USLEEP, do not ship this build! We need usleep
  // support so that multiple processes can connect to the sqlite file at the same time.
  // Without it, transactions only retry every 1 sec instead of every 10ms, leading to
  // awful db lock contention.


即sqlite支持微秒（千分之一毫秒）这样多进程就可以快速的连接sqlite（1秒内多次），否则事务只能能每秒尝试一次，而不是10毫秒