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SPSCQueue: Add PopWait
Adds a condition var to SPSCQueue so when a new log is pushed it will wake the consumer thread that is calling PopWait. This only applies to to queues with NeedSize=true
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@ -9,6 +9,7 @@
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#include <algorithm>
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#include <atomic>
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#include <chrono>
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#include <cstddef>
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#include <mutex>
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#include "common/common_types.h"
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@ -36,6 +37,10 @@ public:
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T& Front() const {
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return read_ptr->current;
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}
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/**
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* Push data to the queue. If NeedSize=True then Push will notify the waiting consumer thread
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*/
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template <typename Arg>
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void Push(Arg&& t) {
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// create the element, add it to the queue
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@ -45,8 +50,11 @@ public:
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ElementPtr* new_ptr = new ElementPtr();
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write_ptr->next.store(new_ptr, std::memory_order_release);
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write_ptr = new_ptr;
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if (NeedSize)
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if (NeedSize) {
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std::lock_guard<std::mutex> lock(size_lock);
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size++;
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size_cv.notify_one();
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}
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}
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void Pop() {
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@ -75,6 +83,25 @@ public:
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return true;
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}
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/**
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* Waits up to timeout for data to be Pushed to the queue. Push uses a condition variable to
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* signal the waiting thread, but only if NeedSize = true. Returns false if the timeout is
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* triggered. If the condition variable is signalled, returns the value from Pop
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* @param T In parameter to store the value if this method returns true
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* @param timeout Time in milliseconds to wait for a signal from a Push
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*/
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bool PopWait(T& t, u64 timeout = 500) {
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if (NeedSize) {
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std::unique_lock<std::mutex> lock(size_lock);
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if (size_cv.wait_for(lock, std::chrono::milliseconds(timeout),
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[& size = size] { return size > 0; })) {
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return Pop(t);
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}
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return false;
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}
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return Pop(t);
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}
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// not thread-safe
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void Clear() {
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size.store(0);
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@ -102,6 +129,9 @@ private:
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ElementPtr* write_ptr;
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ElementPtr* read_ptr;
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std::atomic<u32> size;
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std::mutex size_lock;
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std::condition_variable size_cv;
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};
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// a simple thread-safe,
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