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Bug 1661339. Run the background tasks for gathering printer capabilities on the IO thread pool. r=emilio

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Differential Revision: https://phabricator.services.mozilla.com/D88327
This commit is contained in:
Jonathan Watt 2020-08-26 20:55:47 +00:00
parent 80411452b5
commit f396b19f55
1 changed files with 21 additions and 17 deletions
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38
widget/PrintBackgroundTask.h
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@ -41,23 +41,27 @@ void SpawnPrintBackgroundTask(
// See
// https://stackoverflow.com/questions/47496358/c-lambdas-how-to-capture-variadic-parameter-pack-from-the-upper-scope
// about the tuple shenanigans. It could be improved with C++20
NS_DispatchBackgroundTask(NS_NewRunnableFunction(
"SpawnPrintBackgroundTask",
[holder = std::move(holder), promiseHolder = std::move(promiseHolder),
aBackgroundTask, aArgs = std::make_tuple(std::forward<Args>(aArgs)...)] {
Result result = std::apply(
[&](auto&&... args) {
return (holder->get()->*aBackgroundTask)(args...);
},
std::move(aArgs));
NS_DispatchToMainThread(NS_NewRunnableFunction(
"SpawnPrintBackgroundTaskResolution",
[holder = std::move(holder),
promiseHolder = std::move(promiseHolder),
result = std::move(result)] {
ResolveOrReject(*promiseHolder->get(), *holder->get(), result);
}));
}));
NS_DispatchBackgroundTask(
NS_NewRunnableFunction(
"SpawnPrintBackgroundTask",
[holder = std::move(holder), promiseHolder = std::move(promiseHolder),
aBackgroundTask,
aArgs = std::make_tuple(std::forward<Args>(aArgs)...)] {
Result result = std::apply(
[&](auto&&... args) {
return (holder->get()->*aBackgroundTask)(args...);
},
std::move(aArgs));
NS_DispatchToMainThread(NS_NewRunnableFunction(
"SpawnPrintBackgroundTaskResolution",
[holder = std::move(holder),
promiseHolder = std::move(promiseHolder),
result = std::move(result)] {
ResolveOrReject(*promiseHolder->get(), *holder->get(),
result);
}));
}),
NS_DISPATCH_EVENT_MAY_BLOCK);
}
// Gets a fresh promise into aResultPromise, that resolves whenever the print