l*b
2 楼
不太懂。。。deadlock和语言关系不大吧，都是对thread和数据加锁来实现
a*1
3 楼
哦。
那有什么办法可以 避免啊？
那有什么办法可以 避免啊？
g*e
4 楼
there are 4 conditions, all of which have to be satisfied for deadlock to
happen.
A deadlock situation can arise if and only if all of the following
conditions hold simultaneously in a system:[1]
Mutual Exclusion: At least one resource must be non-shareable.[1] Only one
process can use the resource at any given instant of time.
Hold and Wait or Resource Holding: A process is currently holding at least
one resource and requesting additional resources which are being held by
other processes.
No Preemption: The operating system must not de-allocate resources once they
have been allocated; they must be released by the holding process
voluntarily.
Circular Wait: A process must be waiting for a resource which is being held
by another process, which in turn is waiting for the first process to
release the resource. In general, there is a set of waiting processes, P = {
P1, P2, ..., PN}, such that P1 is waiting for a resource held by P2, P2 is
waiting for a resource held by P3 and so on till PN is waiting for a
resource held by P1.[1][7]
These four conditions are known as the Coffman conditions from their first
description in a 1971 article by Edward G. Coffman, Jr.[7] Unfulfillment of
any of these conditions is enough to preclude a deadlock from occurring.
happen.
A deadlock situation can arise if and only if all of the following
conditions hold simultaneously in a system:[1]
Mutual Exclusion: At least one resource must be non-shareable.[1] Only one
process can use the resource at any given instant of time.
Hold and Wait or Resource Holding: A process is currently holding at least
one resource and requesting additional resources which are being held by
other processes.
No Preemption: The operating system must not de-allocate resources once they
have been allocated; they must be released by the holding process
voluntarily.
Circular Wait: A process must be waiting for a resource which is being held
by another process, which in turn is waiting for the first process to
release the resource. In general, there is a set of waiting processes, P = {
P1, P2, ..., PN}, such that P1 is waiting for a resource held by P2, P2 is
waiting for a resource held by P3 and so on till PN is waiting for a
resource held by P1.[1][7]
These four conditions are known as the Coffman conditions from their first
description in a 1971 article by Edward G. Coffman, Jr.[7] Unfulfillment of
any of these conditions is enough to preclude a deadlock from occurring.
c*s
5 楼
There are many ways to do this. Here is one way which always works.
For each thread, let it acquire all locks in the same order.
For example, thread 1 always acquire lock 1, then lock 2, then lock 3, and
the same for all other threads.
Please refer to slide 14 below for this technique:
http://www.cs.umd.edu/class/fall2012/cmsc433/0101/lecture-notes
For each thread, let it acquire all locks in the same order.
For example, thread 1 always acquire lock 1, then lock 2, then lock 3, and
the same for all other threads.
Please refer to slide 14 below for this technique:
http://www.cs.umd.edu/class/fall2012/cmsc433/0101/lecture-notes
c*s
6 楼
There are many ways to do this. Here is one way which always works.
For each thread, let it acquire all locks in the same order.
For example, thread 1 always acquire lock 1, then lock 2, then lock 3, and
the same for all other threads.
Please refer to slide 14 below for this technique:
http://www.cs.umd.edu/class/fall2012/cmsc433/0101/lecture-notes
For each thread, let it acquire all locks in the same order.
For example, thread 1 always acquire lock 1, then lock 2, then lock 3, and
the same for all other threads.
Please refer to slide 14 below for this technique:
http://www.cs.umd.edu/class/fall2012/cmsc433/0101/lecture-notes
W*g
7 楼
always acquire locks in order.
【在 a*****1 的大作中提到】
: 请高手解答。。
: 怎么做比较好 啊？
: 谢谢。
【在 a*****1 的大作中提到】
: 请高手解答。。
: 怎么做比较好 啊？
: 谢谢。
相关阅读
最近流感太严重了请教前辈能否给个Yelp内推？身份证丢了, 月底回国不是受不了加班，是受不了不公平加班周末刷了题，精疲力尽之余又在知乎上用自身经历...夫妻同在一个公司而隐婚desc应该越复杂越好hr 预约面试时间一女的，很无耻，就是有什么功劳多少人爱好和工作统一的，一材料狗的郁闷FLG如果拿了offer暂时不去，可以保留多久？[内推] Software Engineer needed in Brooklyn NY几年前申请的h1没人发觉现在发帖回帖一点确定出现N个重复吗？现在或者以前的google 的人， 可以join james damore 去sue go好消息！！老川要砍抽签移民，把名额给EB移民最近1块首付，10块月租办了个健身卡亚麻有组接收SDE1么找工作找得快绝望了他怎么了？还想看一下他的文章