LockTableがデッドロックする問題 #18
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yokomotod
commented
Aug 18, 2024
| lm := db.LogManager() | ||
| bm := db.BufferManager() | ||
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| n := 10 |
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n := 3 や 4 だと確率的にPASSする。5ぐらいからほぼ通らなくなる
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Javaのコードも 💀 ？ public class ManyConcurrencyTest {
private static FileMgr fm;
private static LogMgr lm;
private static BufferMgr bm;
public static void main(String[] args) {
// initialize the database system
SimpleDB db = new SimpleDB("concurrencytest", 400, 8);
fm = db.fileMgr();
lm = db.logMgr();
bm = db.bufferMgr();
for (int i = 0; i < 10; i++) {
A a = new A();
new Thread(a).start();
}
}
static class A implements Runnable {
public void run() {
try {
Transaction txA = new Transaction(fm, lm, bm);
BlockId blk1 = new BlockId("testfile", 1);
txA.pin(blk1);
System.out.println("Tx A: request xlock 1");
txA.setInt(blk1, 0, 0, false);
System.out.println("Tx A: receive xlock 1");
Thread.sleep(100);
txA.commit();
System.out.println("Tx A: commit");
} catch (InterruptedException e) {
}
}
}
} |
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という流れに見える…？ 期待する動作は
の流れ？ |
yokomotod
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#20 の再現コード