From 15d573194c95b95ccf4a5480d8e40a7765a00929 Mon Sep 17 00:00:00 2001
From: Morph <39850852+Morph1984@users.noreply.github.com>
Date: Sun, 19 Mar 2023 04:01:47 -0400
Subject: [PATCH] bounded_threadsafe_queue: Add TryPush

---
 src/common/bounded_threadsafe_queue.h | 71 +++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)

diff --git a/src/common/bounded_threadsafe_queue.h b/src/common/bounded_threadsafe_queue.h
index e03427539..eb88cc1d1 100644
--- a/src/common/bounded_threadsafe_queue.h
+++ b/src/common/bounded_threadsafe_queue.h
@@ -22,6 +22,55 @@ class SPSCQueue {
     static_assert((Capacity & (Capacity - 1)) == 0, "Capacity must be a power of two.");
 
 public:
+    bool TryPush(T&& t) {
+        const size_t write_index = m_write_index.load();
+
+        // Check if we have free slots to write to.
+        if ((write_index - m_read_index.load()) == Capacity) {
+            return false;
+        }
+
+        // Determine the position to write to.
+        const size_t pos = write_index % Capacity;
+
+        // Push into the queue.
+        m_data[pos] = std::move(t);
+
+        // Increment the write index.
+        ++m_write_index;
+
+        // Notify the consumer that we have pushed into the queue.
+        std::scoped_lock lock{cv_mutex};
+        cv.notify_one();
+
+        return true;
+    }
+
+    template <typename... Args>
+    bool TryPush(Args&&... args) {
+        const size_t write_index = m_write_index.load();
+
+        // Check if we have free slots to write to.
+        if ((write_index - m_read_index.load()) == Capacity) {
+            return false;
+        }
+
+        // Determine the position to write to.
+        const size_t pos = write_index % Capacity;
+
+        // Emplace into the queue.
+        std::construct_at(std::addressof(m_data[pos]), std::forward<Args>(args)...);
+
+        // Increment the write index.
+        ++m_write_index;
+
+        // Notify the consumer that we have pushed into the queue.
+        std::scoped_lock lock{cv_mutex};
+        cv.notify_one();
+
+        return true;
+    }
+
     void Push(T&& t) {
         const size_t write_index = m_write_index.load();
 
@@ -153,6 +202,17 @@ private:
 template <typename T, size_t Capacity = detail::DefaultCapacity>
 class MPSCQueue {
 public:
+    bool TryPush(T&& t) {
+        std::scoped_lock lock{write_mutex};
+        return spsc_queue.TryPush(std::move(t));
+    }
+
+    template <typename... Args>
+    bool TryPush(Args&&... args) {
+        std::scoped_lock lock{write_mutex};
+        return spsc_queue.TryPush(std::forward<Args>(args)...);
+    }
+
     void Push(T&& t) {
         std::scoped_lock lock{write_mutex};
         spsc_queue.Push(std::move(t));
@@ -196,6 +256,17 @@ private:
 template <typename T, size_t Capacity = detail::DefaultCapacity>
 class MPMCQueue {
 public:
+    bool TryPush(T&& t) {
+        std::scoped_lock lock{write_mutex};
+        return spsc_queue.TryPush(std::move(t));
+    }
+
+    template <typename... Args>
+    bool TryPush(Args&&... args) {
+        std::scoped_lock lock{write_mutex};
+        return spsc_queue.TryPush(std::forward<Args>(args)...);
+    }
+
     void Push(T&& t) {
         std::scoped_lock lock{write_mutex};
         spsc_queue.Push(std::move(t));