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Anna Henningsen
1db0039c50
Workers cannot shut down while requests are open, so keep a counter that is increased whenever libuv requests are made and decreased whenever their callback is called. This also applies to other embedders, who may want to shut down an `Environment` instance early. Many thanks for Stephen Belanger for reviewing the original version of this commit in the Ayo.js project. Fixes: https://github.com/nodejs/node/issues/20517 Refs: https://github.com/ayojs/ayo/pull/85 PR-URL: https://github.com/nodejs/node/pull/19377 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>
62 lines
1.9 KiB
C++
62 lines
1.9 KiB
C++
#ifndef SRC_REQ_WRAP_H_
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#define SRC_REQ_WRAP_H_
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#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#include "async_wrap.h"
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#include "env.h"
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#include "util.h"
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#include "v8.h"
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namespace node {
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template <typename T>
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class ReqWrap : public AsyncWrap {
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public:
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inline ReqWrap(Environment* env,
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v8::Local<v8::Object> object,
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AsyncWrap::ProviderType provider);
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inline ~ReqWrap() override;
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// Call this after the req has been dispatched, if that did not already
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// happen by using Dispatch().
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inline void Dispatched();
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// Call this after a request has finished, if re-using this object is planned.
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inline void Reset();
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T* req() { return &req_; }
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inline void Cancel();
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static ReqWrap* from_req(T* req);
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template <typename LibuvFunction, typename... Args>
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inline int Dispatch(LibuvFunction fn, Args... args);
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private:
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friend class Environment;
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friend int GenDebugSymbols();
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template <typename ReqT, typename U>
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friend struct MakeLibuvRequestCallback;
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ListNode<ReqWrap> req_wrap_queue_;
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typedef void (*callback_t)();
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callback_t original_callback_ = nullptr;
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protected:
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// req_wrap_queue_ needs to be at a fixed offset from the start of the class
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// because it is used by ContainerOf to calculate the address of the embedding
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// ReqWrap. ContainerOf compiles down to simple, fixed pointer arithmetic. It
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// is also used by src/node_postmortem_metadata.cc to calculate offsets and
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// generate debug symbols for ReqWrap, which assumes that the position of
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// members in memory are predictable. sizeof(req_) depends on the type of T,
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// so req_wrap_queue_ would no longer be at a fixed offset if it came after
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// req_. For more information please refer to
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// `doc/guides/node-postmortem-support.md`
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T req_;
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};
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} // namespace node
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#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
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#endif // SRC_REQ_WRAP_H_
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