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refactor: Node.js temporary "explicit" microtask policy scope pattern (#46973)

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refactor: Node.js explicit microtask scope pattern
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Calvin 2025-05-07 19:21:39 -06:00 • committed by GitHub
commit 580fa57a29
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5 changed files with 60 additions and 44 deletions
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20
shell/renderer/electron_renderer_client.cc
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@ -16,6 +16,7 @@
#include "shell/common/gin_helper/event_emitter_caller.h"
#include "shell/common/node_bindings.h"
#include "shell/common/node_includes.h"
#include "shell/common/node_util.h"
#include "shell/common/options_switches.h"
#include "shell/renderer/electron_render_frame_observer.h"
#include "shell/renderer/web_worker_observer.h"
@ -178,19 +179,12 @@ void ElectronRendererClient::WillReleaseScriptContext(
if (env == node_bindings_->uv_env())
node_bindings_->set_uv_env(nullptr);
// Destroying the node environment will also run the uv loop,
// Node.js expects `kExplicit` microtasks policy and will run microtasks
// checkpoints after every call into JavaScript. Since we use a different
// policy in the renderer - switch to `kExplicit` and then drop back to the
// previous policy value.
v8::MicrotaskQueue* microtask_queue = context->GetMicrotaskQueue();
auto old_policy = microtask_queue->microtasks_policy();
DCHECK_EQ(microtask_queue->GetMicrotasksScopeDepth(), 0);
microtask_queue->set_microtasks_policy(v8::MicrotasksPolicy::kExplicit);
environments_.erase(iter);
microtask_queue->set_microtasks_policy(old_policy);
// Destroying the node environment will also run the uv loop.
{
util::ExplicitMicrotasksScope microtasks_scope(
context->GetMicrotaskQueue());
environments_.erase(iter);
}
// ElectronBindings is tracking node environments.
electron_bindings_->EnvironmentDestroyed(env);