Re: [Boost-Users] stop a thread

William E. Kempf

10 Jan 2003 10 Jan '03

12:42 p.m.

From: "hlh771 "

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when the main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

Today you should use a flag and a condition/mutex combination. Direct support for cancellation is being provided in a future release. William E. Kempf wekempf@cox.net

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hlh771 <hlh771＠yahoo.com.cn>

11 Jan 11 Jan

5:09 p.m.

New subject: stop a thread

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From: "hlh771 "

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when

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main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

Today you should use a flag and a condition/mutex combination. Direct support for cancellation is being provided in a future release.

William E. Kempf wekempf@c... Thanks a lot. Can I only use a bool flag?Although more than one thread may access

--- In Boost-Users@yahoogroups.com, William E. Kempf wrote: the the flag and at least a thread write the flag, but it do not seems to cause problem, and I have used this means in a one multithreading program(not use boost/threads),it runs good.

Aschwin Gopalan

22 Jan 22 Jan

10:52 a.m.

New subject: stop a thread

William E. Kempf wrote:

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From: "hlh771 "

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when the main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

Today you should use a flag and a condition/mutex combination. Direct support for cancellation is being provided in a future release.

Actually, this works fine for ordinary loops. The problem I am facing is how to stop a thread which may sit in blocking system calls like reading from a (blocking) socket. Is there any "standard" way to solve this problem? Now, I am using nonblocking sockets, implementing "timeouts" myself, but it just doesn't feel right... Aki

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William E. Kempf wekempf@cox.net

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William E. Kempf

24 Jan 24 Jan

5:01 a.m.

New subject: [Boost-Users] Re: stop a thread

Aschwin Gopalan said:

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William E. Kempf wrote:

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From: "hlh771 "

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when the main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

Today you should use a flag and a condition/mutex combination. Direct support for cancellation is being provided in a future release.

Actually, this works fine for ordinary loops. The problem I am facing is how to stop a thread which may sit in blocking system calls like reading from a (blocking) socket. Is there any "standard" way to solve this problem? Now, I am using nonblocking sockets, implementing "timeouts" myself, but it just doesn't feel right...

No, there's no "standard" way to do this, and it's one of the most difficult things I'm facing with adding cancellation to Boost.Threads. For specific cases there's usually a solution. For example, in your case you could use select() with a file descripter created for the sole purpose of waking up the thread when you want to cancel it. But solutions like this are not necessarily completely portable, and don't apply to every use case where there's a blocking call. William E. Kempf wekempf@cox.net

hlh771 <hlh771＠yahoo.com.cn>

3 Mar 3 Mar

1:11 a.m.

New subject: stop a thread

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From: "hlh771 "

How to stop(or cancel) a thread? Suppose I have a main thread and a worker thread, the worker thread does something looply,and when

--- In Boost-Users@yahoogroups.com, William E. Kempf wrote: the

...

...
main thread get a message indicating the process should exit, I want stop the worker thread,how to do that?I have read other thread library,their thread class supply a method called stop or cancel which stops the thread. Their Implementation is:the thread class has a data member indicating whether the thread should stop,and the thread function looply check the data member whether the thread should stop.Generally the data member's type is a bool or Event. Is it the best way to stop the thread? How the boost to deal with this? Thanks in advance.

Today you should use a flag and a condition/mutex combination. Direct support for cancellation is being provided in a future release.

William E. Kempf wekempf@c... Thanks.I'm not very good at multithread programming,but I like boost.threads. How to use a flag and a condition/mutex combination to cancel a thread?Why use condition?Could you show me a simple example? Expect your answer.

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Aschwin Gopalan
hlh771 <hlh771＠yahoo.com.cn>
William E. Kempf