Fixed RPM / Deb / APK packages and enabled CI build #11
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| if [[ -z $BUILD_IMAGE ]]; then | ||
| # pull the image from DockerHub by default | ||
| docker pull $IMAGE_NAME | ||
| else | ||
| docker build --platform linux/amd64 -t $IMAGE_NAME $ROOT_DIR/pulsar-client-cpp/pkg/deb | ||
| fi | ||
| IMAGE_NAME=apachepulsar/pulsar-build:debian-9-2.11-x86_64 |
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Back to the issue that has been discussed before, what's the process if I want to update the Dockerfile of the base image? How should I name the image?
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Ideally, we should use unique image tags.
At this point the process would be to update the Dockerfile, build the image locally and push it to Dockerhub with the same tag. All the builds after that will sync and fetch the updated image.
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Got it. We should include this process when we added documents for the release process.
BewareMyPower
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Sep 30, 2022
merlimat
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Oct 30, 2023
#334) * Fix possible deadlock of Future when adding a listener after completed ### Motivation There is a case that deadlock could happen for a `Future`. Assume there is a `Promise` and its `Future`. 1. Call `Future::addListener` to add a listener that tries to acquire a user-provided mutex (`lock`). 2. Thread 1: Acquire `lock` first. 3. Thread 2: Call `Promise::setValue`, the listener will be triggered first before completed. Since `lock` is held by Thread 1, the listener will be blocked. 4. Thread 1: Call `Future::addListener`, since it detects the `InternalState::completed_` is true, it will call `get` to retrieve the result and value. Then, deadlock happens: - Thread 1 waits for `lock` is released, and then complete `InternalState::future_`. - Thread 2 holds `lock` but wait for `InternalState::future_` is completed. In a real world case, if we acquire a lock before `ProducerImpl::closeAsync`, then another thread call `setValue` in `ClientConnection::handleSuccess` and the callback of `createProducerAsync` tries to acquire the lock, `handleSuccess` will be blocked. Then in `closeAsync`, the current thread will be blocked in: ```c++ cnx->sendRequestWithId(Commands::newCloseProducer(producerId_, requestId), requestId) .addListener([self, callback](Result result, const ResponseData&) { callback(result); }); ``` The stacks: ``` Thread 1: #11 0x00007fab80da2173 in pulsar::InternalState<...>::complete (this=0x3d53e7a10, result=..., value=...) at lib/Futre.h:61 #13 pulsar::ClientConnection::handleSuccess (this=this@entry=0x2214bc000, success=...) at lib/ClientConnection.cc:1552 Thread 2: #8 get (result=..., this=0x3d53e7a10) at lib/Future.h:69 #9 pulsar::InternalState<...>::addListener (this=this@entry=0x3d53e7a10, listener=...) at lib/Future.h:51 #11 0x00007fab80e8dc4e in pulsar::ProducerImpl::closeAsync at lib/ProducerImpl.cc:794 ``` There are two points that make the deadlock: 1. We use `completed_` to represent if the future is completed. However, after it's true, the future might not be completed because the value is not set and the listeners are not completed. 2. If `addListener` is called after it's completed, we still push the listener to `listeners_` so that previous listeners could be executed before the new listener. This guarantee is unnecessarily strong. ### Modifications First, complete the future before calling the listeners. Then, use an enum to represent the status: - INITIAL: `complete` has not been called - COMPLETING: when the 1st time `complete` is called, the status will change from INITIAL to COMPLETING - COMPLETED: the future is completed. Besides, implementation of `Future` is simplified. #299 fixes a possible mutex crash by introducing the `std::future`. However, the root cause is the conditional variable is not used correctly: > Even if the shared variable is atomic, it must be modified while owning the mutex to correctly publish the modification to the waiting thread. See https://en.cppreference.com/w/cpp/thread/condition_variable The simplest way to fix #298 is just adding `lock.lock()` before `state->condition.notify_all();`. * Acquire lock again * Add initial value
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Motivation
Fixed RPM / Deb / APK packages and enabled CI build