使用Unsafe來實現自定義鎖

1.使用unsafe類

import

sun.misc.unsafe;
class
unsafepackage  
catch
(exception ex) 
}public
static
unsafe getunsafe() 
}

2.宣告簡單鎖

class

customlock  
catch
(exception ex) 
}private
boolean comareandsetstatus(int originalstatus, int
updatestatus) 
public
boolean
lock() 
"競爭鎖失敗!進入等待佇列");
push(thread.currentthread());
while (!comareandsetstatus(0, 1)) 
return
true
;    }
public
boolean
unlock() 
return
true
;    }
private
void
push(thread thread) 
private
thread pop() 
}

3.競爭鎖失敗的進佇列

class

waitingqueue  
catch
(exception ex) 
}public
void
push(thread thread) 
queue.offerlast(thread);
comareandsetstatus(1, 0);
return
;    }
public
thread pop() 
thread elem = null
;        
if (!queue.isempty()) 
comareandsetstatus(1, 0);
return
elem;
}private
boolean comareandsetstatus(int originalstatus, int
updatestatus) 
}

3.呼叫如下

public

class
customlocktest 
countdownlatch.countdown();
} finally
}}.start();
});countdownlatch.await();
long end =system.currenttimemillis();
system.out.println("結果值為:" + count + ",共花費了" + (end - start) + "毫秒!");
}}

結果值為:1500000,共花費了601毫秒!

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