diff options
Diffstat (limited to 'indra/llcommon/workqueue.h')
| -rw-r--r-- | indra/llcommon/workqueue.h | 135 |
1 files changed, 53 insertions, 82 deletions
diff --git a/indra/llcommon/workqueue.h b/indra/llcommon/workqueue.h index 5b704e7198..87fdd1517f 100644 --- a/indra/llcommon/workqueue.h +++ b/indra/llcommon/workqueue.h @@ -83,13 +83,10 @@ namespace LL /*---------------------- fire and forget API -----------------------*/ - /// fire-and-forget - virtual void post(const Work&) = 0; - /** * post work, unless the queue is closed before we can post */ - virtual bool postIfOpen(const Work&) = 0; + virtual bool post(const Work&) = 0; /** * post work, unless the queue is full @@ -247,13 +244,10 @@ namespace LL /*---------------------- fire and forget API -----------------------*/ - /// fire-and-forget - void post(const Work&) override; - /** * post work, unless the queue is closed before we can post */ - bool postIfOpen(const Work&) override; + bool post(const Work&) override; /** * post work, unless the queue is full @@ -320,22 +314,16 @@ namespace LL /*---------------------- fire and forget API -----------------------*/ - /// fire-and-forget - void post(const Work& callable) override; - - /// fire-and-forget, but at a particular (future?) time - void post(const Work& callable, const TimePoint& time); - /** * post work, unless the queue is closed before we can post */ - bool postIfOpen(const Work& callable) override; + bool post(const Work& callable) override; /** * post work for a particular time, unless the queue is closed before * we can post */ - bool postIfOpen(const Work& callable, const TimePoint& time); + bool post(const Work& callable, const TimePoint& time); /** * post work, unless the queue is full @@ -356,7 +344,7 @@ namespace LL * an LLCond variant, e.g. LLOneShotCond or LLBoolCond. */ template <typename Rep, typename Period, typename CALLABLE> - void postEvery(const std::chrono::duration<Rep, Period>& interval, + bool postEvery(const std::chrono::duration<Rep, Period>& interval, CALLABLE&& callable); private: @@ -417,15 +405,10 @@ namespace LL // move-only callable; but naturally this statement must be // the last time we reference this instance, which may become // moved-from. - try - { - auto target{ std::dynamic_pointer_cast<WorkSchedule>(mTarget.lock()) }; - target->post(std::move(*this), mStart); - } - catch (const Closed&) - { - // Once this queue is closed, oh well, just stop - } + auto target{ std::dynamic_pointer_cast<WorkSchedule>(mTarget.lock()) }; + // Discard bool return: once this queue is closed, oh well, + // just stop + target->post(std::move(*this), mStart); } } @@ -437,7 +420,7 @@ namespace LL }; template <typename Rep, typename Period, typename CALLABLE> - void WorkSchedule::postEvery(const std::chrono::duration<Rep, Period>& interval, + bool WorkSchedule::postEvery(const std::chrono::duration<Rep, Period>& interval, CALLABLE&& callable) { if (interval.count() <= 0) @@ -454,7 +437,7 @@ namespace LL // Instantiate and post a suitable BackJack, binding a weak_ptr to // self, the current time, the desired interval and the desired // callable. - post( + return post( BackJack<Rep, Period, CALLABLE>( getWeak(), TimePoint::clock::now(), interval, std::move(callable))); } @@ -516,48 +499,37 @@ namespace LL // Here we believe target WorkQueue still exists. Post to it a // lambda that packages our callable, our callback and a weak_ptr // to this originating WorkQueue. - try - { - tptr->post( - [reply = super::getWeak(), - callable = std::move(callable), - callback = std::move(callback)] - () mutable + return tptr->post( + [reply = super::getWeak(), + callable = std::move(callable), + callback = std::move(callback)] + () mutable + { + // Use postMaybe() below in case this originating WorkQueue + // has been closed or destroyed. Remember, the outer lambda is + // now running on a thread servicing the target WorkQueue, and + // real time has elapsed since postTo()'s tptr->post() call. + try { - // Use postMaybe() below in case this originating WorkQueue - // has been closed or destroyed. Remember, the outer lambda is - // now running on a thread servicing the target WorkQueue, and - // real time has elapsed since postTo()'s tptr->post() call. - try - { - // Make a reply lambda to repost to THIS WorkQueue. - // Delegate to makeReplyLambda() so we can partially - // specialize on void return. - postMaybe(reply, makeReplyLambda(std::move(callable), std::move(callback))); - } - catch (...) - { - // Either variant of makeReplyLambda() is responsible for - // calling the caller's callable. If that throws, return - // the exception to the originating thread. - postMaybe( - reply, - // Bind the current exception to transport back to the - // originating WorkQueue. Once there, rethrow it. - [exc = std::current_exception()](){ std::rethrow_exception(exc); }); - } - }, - // if caller passed a TimePoint, pass it along to post() - std::forward<ARGS>(args)...); - } - catch (const Closed&) - { - // target WorkQueue still exists, but is Closed - return false; - } - - // looks like we were able to post() - return true; + // Make a reply lambda to repost to THIS WorkQueue. + // Delegate to makeReplyLambda() so we can partially + // specialize on void return. + postMaybe(reply, makeReplyLambda(std::move(callable), std::move(callback))); + } + catch (...) + { + // Either variant of makeReplyLambda() is responsible for + // calling the caller's callable. If that throws, return + // the exception to the originating thread. + postMaybe( + reply, + // Bind the current exception to transport back to the + // originating WorkQueue. Once there, rethrow it. + [exc = std::current_exception()](){ std::rethrow_exception(exc); }); + } + }, + // if caller passed a TimePoint, pass it along to post() + std::forward<ARGS>(args)...); } template <typename... ARGS> @@ -568,18 +540,9 @@ namespace LL auto tptr = target.lock(); if (tptr) { - try - { - tptr->post(std::forward<ARGS>(args)...); - // we were able to post() - return true; - } - catch (const Closed&) - { - // target WorkQueue still exists, but is Closed - } + return tptr->post(std::forward<ARGS>(args)...); } - // either target no longer exists, or its WorkQueue is Closed + // target no longer exists return false; } @@ -591,7 +554,7 @@ namespace LL auto operator()(WorkQueueBase* self, CALLABLE&& callable, ARGS&&... args) { LLCoros::Promise<RETURNTYPE> promise; - self->post( + bool posted = self->post( // We dare to bind a reference to Promise because it's // specifically designed for cross-thread communication. [&promise, callable = std::move(callable)]() @@ -608,6 +571,10 @@ namespace LL }, // if caller passed a TimePoint, pass it to post() std::forward<ARGS>(args)...); + if (! posted) + { + LLTHROW(Closed); + } auto future{ LLCoros::getFuture(promise) }; // now, on the calling thread, wait for that result LLCoros::TempStatus st("waiting for WorkQueue::waitForResult()"); @@ -623,7 +590,7 @@ namespace LL void operator()(WorkQueueBase* self, CALLABLE&& callable, ARGS&&... args) { LLCoros::Promise<void> promise; - self->post( + bool posted = self->post( // &promise is designed for cross-thread access [&promise, callable = std::move(callable)]() mutable { @@ -639,6 +606,10 @@ namespace LL }, // if caller passed a TimePoint, pass it to post() std::forward<ARGS>(args)...); + if (! posted) + { + LLTHROW(Closed); + } auto future{ LLCoros::getFuture(promise) }; // block until set_value() LLCoros::TempStatus st("waiting for void WorkQueue::waitForResult()"); |