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worker: make MessagePort uv_async_t inline field #26271

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worker: make MessagePort uv_async_t inline field #26271

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addaleax
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It’s not obvious why this was a heap allocation in the first place,
but it’s unneccessary. Most other HandleWraps also store the
libuv handle directly.

(This is going to have a minor merge conflict with #26099 so I’d wait until after that one lands before merging this.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

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@addaleax sadly an error occured when I tried to trigger a build :(

@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Feb 23, 2019
@addaleax addaleax added the worker Issues and PRs related to Worker support. label Feb 23, 2019
gireeshpunathil
gireeshpunathil reviewed Feb 23, 2019
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src/node_messaging.cc
AsyncWrap::PROVIDER_MESSAGEPORT),
data_(new MessagePortData(this)) {
auto onmessage = [](uv_async_t* handle) {
// Called when data has been put into the queue.
MessagePort* channel = static_cast<MessagePort*>(handle->data);
MessagePort* channel = ContainerOf(&MessagePort::async_, handle);
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I wanted to ask this earlier as well - what is the consideration behind obtaining this through pointer arithmetic over the other one?

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For one, the address can't change; the contents of handle->data can.

In fact, the old code is mildly wrong because HandleWrap also sets handle_->data = this (where this is an instance of HandleWrap rather than MessagePort) so static_casting that to MessagePort afterwards would be wrong if multiple inheritance were involved.

src/node_messaging.cc
@@ -472,21 +472,13 @@ MessagePort::MessagePort(Environment* env,
Debug(this, "Created message port");
}

void MessagePort::AddToIncomingQueue(Message&& message) {
data_->AddToIncomingQueue(std::move(message));
}
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how is this change related?

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It’s not, it’s just something that I noticed, and putting it into another PR would have lead to yet another merge conflict. I’ve split it into a separate commit, as @bnoordhuis suggested.

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thanks. part of my question (which I meant to ask but did not come out like that) was why this change required at all - that is not covered in the PR description. But I got it now as: it is an unused piece of code.

bnoordhuis
bnoordhuis approved these changes Feb 23, 2019
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The removal of MessagePort::AddToIncomingQueue() should arguably be a separate commit.

src/node_messaging.cc
AsyncWrap::PROVIDER_MESSAGEPORT),
data_(new MessagePortData(this)) {
auto onmessage = [](uv_async_t* handle) {
// Called when data has been put into the queue.
MessagePort* channel = static_cast<MessagePort*>(handle->data);
MessagePort* channel = ContainerOf(&MessagePort::async_, handle);
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For one, the address can't change; the contents of handle->data can.

In fact, the old code is mildly wrong because HandleWrap also sets handle_->data = this (where this is an instance of HandleWrap rather than MessagePort) so static_casting that to MessagePort afterwards would be wrong if multiple inheritance were involved.

@addaleax
worker: remove MessagePort::AddToIncomingQueue
e463971
@addaleax
worker: make MessagePort uv_async_t inline field
7c8f4c2 
It’s not obvious why this was a heap allocation in the first place,
but it’s unneccessary. Most other `HandleWrap`s also store the
libuv handle directly.
@addaleax
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addaleax commented Mar 1, 2019

Rebased, new CI: https://ci.nodejs.org/job/node-test-pull-request/21081/

@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Mar 1, 2019
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addaleax commented Mar 1, 2019

Landed in 4dd7c4b, 0fc40c8

@addaleax addaleax closed this Mar 1, 2019
@addaleax addaleax deleted the messageport-async-inline branch March 1, 2019 20:46
addaleax added a commit that referenced this pull request Mar 1, 2019
@addaleax
worker: remove MessagePort::AddToIncomingQueue
4dd7c4b 
PR-URL: #26271
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
addaleax added a commit that referenced this pull request Mar 1, 2019
@addaleax
worker: make MessagePort uv_async_t inline field
0fc40c8 
It’s not obvious why this was a heap allocation in the first place,
but it’s unneccessary. Most other `HandleWrap`s also store the
libuv handle directly.

PR-URL: #26271
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
addaleax added a commit that referenced this pull request Mar 1, 2019
@addaleax
worker: remove MessagePort::AddToIncomingQueue
51f01aa 
PR-URL: #26271
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
addaleax added a commit that referenced this pull request Mar 1, 2019
@addaleax
worker: make MessagePort uv_async_t inline field
6fdc502 
It’s not obvious why this was a heap allocation in the first place,
but it’s unneccessary. Most other `HandleWrap`s also store the
libuv handle directly.

PR-URL: #26271
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
@BridgeAR BridgeAR mentioned this pull request Mar 4, 2019
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@gireeshpunathil gireeshpunathil gireeshpunathil approved these changes

@richardlau richardlau richardlau approved these changes

@jasnell jasnell jasnell approved these changes

@bnoordhuis bnoordhuis bnoordhuis approved these changes

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