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Merge pull request #5062 from FearlessTobi/port-3173 

Port yuzu-emu/yuzu#3173: "common: SPSCQueue: Notify after incrementing queue size."
This commit is contained in:
Pengfei Zhu 2020-02-10 12:10:45 +08:00 committed by GitHub
parent 03cde53cb6 591c6a64d7
commit b53b4bfb17
1 changed files with 8 additions and 1 deletions
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9
src/common/threadsafe_queue.h
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@ -46,8 +46,15 @@ public:
ElementPtr* new_ptr = new ElementPtr(); ElementPtr* new_ptr = new ElementPtr();
write_ptr->next.store(new_ptr, std::memory_order_release); write_ptr->next.store(new_ptr, std::memory_order_release);
write_ptr = new_ptr; write_ptr = new_ptr;
++size;
const size_t previous_size{size++};
// Acquire the mutex and then immediately release it as a fence.
// TODO(bunnei): This can be replaced with C++20 waitable atomics when properly supported.
// See discussion on https://github.com/yuzu-emu/yuzu/pull/3173 for details.
if (previous_size == 0) {
std::lock_guard lock{cv_mutex};
}
cv.notify_one(); cv.notify_one();
} }