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common: SPSCQueue: Notify after incrementing queue size.

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This commit is contained in:
bunnei 2019-12-16 20:39:53 -05:00
parent 34f8881d3e
commit 67b8ecc73e
1 changed files with 9 additions and 2 deletions
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11
src/common/threadsafe_queue.h
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@ -46,9 +46,16 @@ public:
ElementPtr* new_ptr = new ElementPtr();
write_ptr->next.store(new_ptr, std::memory_order_release);
write_ptr = new_ptr;
cv.notify_one();
++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();
}
void Pop() {