Sqlite ANR (SQLiteConnectionPool

连接池的关系：
https://blog.csdn.net/guoqifa29/article/details/50741993
https://www.jianshu.com/p/f88de2c1343f

数据库 ANR 的例子：https://www.cnblogs.com/caoxinyu/p/10568523.html

  override fun onStart() {
    super.onStart()
    bt_mock_db.setOnClickListener {
      Thread {
        db.beginTransaction();
        try {
            while (true) {}
            db.setTransactionSuccessful();
        } finally {
            db.endTransaction();
        }
      }.run()
      db.query()
    }
  }

会抛出如下异常

 at sun.misc.Unsafe.park(Unsafe.java:299)
  at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
  at android.database.sqlite.SQLiteConnectionPool.waitForConnection(SQLiteConnectionPool.java:670)
  at android.database.sqlite.SQLiteConnectionPool.acquireConnection(SQLiteConnectionPool.java:348)
  at android.database.sqlite.SQLiteSession.acquireConnection(SQLiteSession.java:894)
  at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:586)
  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)