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Posted to dev@brpc.apache.org by "Eviltuzki (via GitHub)" <gi...@apache.org> on 2023/04/11 08:19:23 UTC
[I] 多次调用能使server用同一个线程处理么？ (brpc)
Eviltuzki opened a new issue, #2203:
URL: https://github.com/apache/brpc/issues/2203
**Is your feature request related to a problem? (你需要的功能是否与某个问题有关?)**
是否有办法使得server端处理client请求的时候，始终使用的是同一个线程，也就是调用bthread_self()返回的值保持不变
我这边现在有需求依赖上下文(是另外一个lib提供的)，如果不同请求的线程切换了，上下文信息就丢失了，后续请求都会失败
上下文对我这边调用是黑盒的，无法直接干预，只能通过保障我这边线程不切换
或者是否能指定一个单线程的线程池来提供服务？
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "TousakaRin (via GitHub)" <gi...@apache.org>.
TousakaRin commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-3139081952
> > > [@wwbmmm](https://github.com/wwbmmm) 想问下，如果 bthread 只调用了阻塞 pthread 的函数（read、write、mutex_lock
> 当前维护的一个 brpc 老项目用到了 thread_local，如果向下游发起 rpc 会触发当前 bthread 切换 pthread，应该早就出问题了。但看文档和一些 issue 中提到会切换。所以这里不确定:(
可以在rpc前后保存thread id对比一下
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "jinshuai86 (via GitHub)" <gi...@apache.org>.
jinshuai86 commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-3139005685
> > [@wwbmmm](https://github.com/wwbmmm) 想问下，如果 bthread 只调用了阻塞 pthread 的函数（read、write、mutex_lock等）或者发起了一次 RPC ，在 bthread 和 pthread 等待期间或者被唤醒后，会触发当前 bthread 切换到其它 pthread 执行吗？
>
> 阻塞的pthread函数不会切换， 发起rpc或者bthread::join等操作可能会触发切换
当前维护的一个 brpc 老项目用到了 thread_local，如果向下游发起 rpc 会触发当前 bthread 切换 pthread，应该早就出问题了。但看文档和一些 issue 中提到会切换。所以这里不确定:(
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "ehds (via GitHub)" <gi...@apache.org>.
ehds commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-1502936336
可以尝试开启 `usercode_in_pthread`，
> 代码中广泛地使用pthread local传递session级别全局数据，在RPC前后均使用了相同的pthread local的数据，且数据有前后依赖性。比如在RPC前往pthread-local保存了一个值，RPC后又读出来希望和之前保存的相等，就会有问题。而像tcmalloc虽然也使用了pthread/LWP local，但每次使用之间没有直接的依赖，是安全的。
对于这些情况，brpc提供了pthread模式，开启**-usercode_in_pthread**后，用户代码均会在pthread中运行，原先阻塞bthread的函数转而阻塞pthread。
参考这个文档 https://github.com/apache/brpc/blob/master/docs/cn/server.md#pthread%E6%A8%A1%E5%BC%8F
如果在 server 处理用户请求的代码中，如果没有发生能导致 bthread 阻塞的函数，例如 bthread::usleep、 bthread::bthread_start_urgent 等这些函数，线程是不会发生切换的。
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "jinshuai86 (via GitHub)" <gi...@apache.org>.
jinshuai86 commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-3138945314
@wwbmmm 想问下，如果 bthread 只调用了阻塞 pthread 的函数（read、write、mutex_lock等）或者发起了一次 RPC ，在 bthread 和 pthread 等待期间或者被唤醒后，会触发当前 bthread 切换到其它 pthread 执行吗？
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "wwbmmm (via GitHub)" <gi...@apache.org>.
wwbmmm commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-1511197353
可以把请求丢到bthread execution_queue去处理
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Re: [I] 多次调用能使server用同一个线程处理么？ (brpc)
Posted by "TousakaRin (via GitHub)" <gi...@apache.org>.
TousakaRin commented on issue #2203:
URL: https://github.com/apache/brpc/issues/2203#issuecomment-3138975419
> [@wwbmmm](https://github.com/wwbmmm) 想问下，如果 bthread 只调用了阻塞 pthread 的函数（read、write、mutex_lock等）或者发起了一次 RPC ，在 bthread 和 pthread 等待期间或者被唤醒后，会触发当前 bthread 切换到其它 pthread 执行吗？
阻塞的pthread函数不会切换， 发起rpc或者bthread::join等操作可能会触发切换
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