Skip to content

[win32] Fix overflow in TaskRunnerWindow. #182822

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
knopp merged 5 commits into from
Feb 24, 2026
Merged

[win32] Fix overflow in TaskRunnerWindow. #182822

Show file tree
Hide file tree
Changes from 1 commit
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
bbb2992
[win32] Empty TaskRunner::ProcessTasks must return nanoseconds::max.
knopp Feb 24, 2026
40f941e
Add comment
knopp Feb 24, 2026
b39058e
Fix typo
knopp Feb 24, 2026
ca439ec
Update TaskRunnerWindow::SetTimer to prevent overflow.
knopp Feb 24, 2026
6da471c
Remove obsolete comment.
knopp Feb 24, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 5 additions & 4 deletions engine/src/flutter/shell/platform/windows/task_runner.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -63,10 +63,11 @@ std::chrono::nanoseconds TaskRunner::ProcessTasks() {
// Calculate duration to sleep for on next iteration.
{
std::lock_guard<std::mutex> lock(task_queue_mutex_);
const auto next_wake = task_queue_.empty() ? TaskTimePoint::max()
: task_queue_.top().fire_time;

return std::min(next_wake - now, std::chrono::nanoseconds::max());
if (task_queue_.empty()) {
return std::chrono::nanoseconds::max();
} else {
return task_queue_.top().fire_time - now;
}
}
}

Expand Down
6 changes: 6 additions & 0 deletions engine/src/flutter/shell/platform/windows/task_runner_unittests.cc
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -121,6 +121,12 @@ class TestTaskRunnerWindow : public TaskRunnerWindow {
TestTaskRunnerWindow() : TaskRunnerWindow() {}
};

TEST(TaskRunnerTest, EmptyTaskRunnerReturnsNanSecondsMax) {
TaskRunner runner(MockGetCurrentTime, [](const FlutterTask*) {});
auto res = runner.ProcessTasks();
EXPECT_EQ(res, std::chrono::nanoseconds::max());
}

TEST(TaskRunnerTest, TaskRunnerWindowCoalescesWakeUpMessages) {
class Delegate : public TaskRunnerWindow::Delegate {
public:
Expand Down