Fix concurrent_bounding_queue capacity on copy, move and swap operations

include/oneapi/tbb/concurrent_queue.h

@@ -1,5 +1,5 @@
 /*
-    Copyright (c) 2005-2023 Intel Corporation
+    Copyright (c) 2005-2025 Intel Corporation
 
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
@@ -48,7 +48,6 @@ std::pair<bool, ticket_type> internal_try_pop_impl(void* dst, QueueRep& queue, A
 
 // A high-performance thread-safe non-blocking concurrent queue.
 // Multiple threads may each push and pop concurrently.
-// Assignment construction is not allowed.
 template <typename T, typename Allocator = tbb::cache_aligned_allocator<T>>
 class concurrent_queue {
     using allocator_traits_type = tbb::detail::allocator_traits<Allocator>;
@@ -317,7 +316,6 @@ namespace d2 {
 // A high-performance thread-safe blocking concurrent bounded queue.
 // Supports boundedness and blocking semantics.
 // Multiple threads may each push and pop concurrently.
-// Assignment construction is not allowed.
 template <typename T, typename Allocator = tbb::cache_aligned_allocator<T>>
 class concurrent_bounded_queue {
     using allocator_traits_type = tbb::detail::allocator_traits<Allocator>;
@@ -376,12 +374,14 @@ class concurrent_bounded_queue {
     concurrent_bounded_queue( const concurrent_bounded_queue& src, const allocator_type& a ) :
         concurrent_bounded_queue(a)
     {
+        my_capacity = src.my_capacity;
         my_queue_representation->assign(*src.my_queue_representation, my_allocator, copy_construct_item);
     }
 
     concurrent_bounded_queue( const concurrent_bounded_queue& src ) :
         concurrent_bounded_queue(queue_allocator_traits::select_on_container_copy_construction(src.get_allocator()))
     {
+        my_capacity = src.my_capacity;
         my_queue_representation->assign(*src.my_queue_representation, my_allocator, copy_construct_item);
     }
 
@@ -420,6 +420,7 @@ class concurrent_bounded_queue {
         if (my_queue_representation != other.my_queue_representation) {
             clear();
             my_allocator = other.my_allocator;
+            my_capacity = other.my_capacity;
             my_queue_representation->assign(*other.my_queue_representation, my_allocator, copy_construct_item);
         }
         return *this;
@@ -435,6 +436,7 @@ class concurrent_bounded_queue {
                 my_queue_representation->assign(*other.my_queue_representation, other.my_allocator, move_construct_item);
                 other.clear();
                 my_allocator = std::move(other.my_allocator);
+                my_capacity = other.my_capacity;
             }
         }
         return *this;
@@ -547,8 +549,10 @@ class concurrent_bounded_queue {
 
 private:
     void internal_swap( concurrent_bounded_queue& src ) {
-        std::swap(my_queue_representation, src.my_queue_representation);
-        std::swap(my_monitors, src.my_monitors);
+        using std::swap;
+        swap(my_queue_representation, src.my_queue_representation);
+        swap(my_capacity, src.my_capacity);
+        swap(my_monitors, src.my_monitors);
     }
 
     static constexpr std::ptrdiff_t infinite_capacity = std::ptrdiff_t(~size_type(0) / 2);

test/tbb/test_concurrent_queue.cpp

@@ -1,5 +1,5 @@
 /*
-    Copyright (c) 2005-2023 Intel Corporation
+    Copyright (c) 2005-2025 Intel Corporation
 
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
@@ -282,3 +282,45 @@ TEST_CASE("Test clear and dtor with TrackableItem") {
     test_tracking_dtors_on_clear<oneapi::tbb::concurrent_queue<TrackableItem>>();
     test_tracking_dtors_on_clear<oneapi::tbb::concurrent_bounded_queue<TrackableItem>>();
 }
+
+//! \brief \ref regression 
+TEST_CASE("test capacity on modifying operations") {
+    // Test that concurrent_bounded_queue capacity is preserved on copying, moving and swapping
+    using queue_type = oneapi::tbb::concurrent_bounded_queue<int>;
+    using capacity_type = typename queue_type::size_type;
+
+    queue_type q;
+    capacity_type desired_capacity = 64;
+
+    q.set_capacity(desired_capacity);
+    REQUIRE_MESSAGE(q.capacity() == desired_capacity, "Capacity is not set correctly");
+
+    queue_type q_copy(q);
+    REQUIRE_MESSAGE(q_copy.capacity() == desired_capacity, "Capacity is not preserved on copying");
+
+    queue_type q_move(std::move(q));
+    REQUIRE_MESSAGE(q_move.capacity() == desired_capacity, "Capacity is not preserved on moving");
+
+    queue_type different_capacity_q1;
+    different_capacity_q1.set_capacity(desired_capacity * 2);
+
+    different_capacity_q1 = q_move;
+    REQUIRE_MESSAGE(different_capacity_q1.capacity() == desired_capacity,
+                    "Capacity is not preserved on copy assignment");
+
+    queue_type different_capacity_q2;
+    different_capacity_q2.set_capacity(desired_capacity * 2);
+
+    different_capacity_q2 = std::move(q_move);
+    REQUIRE_MESSAGE(different_capacity_q2.capacity() == desired_capacity,
+                    "Capacity is not preserved on move assignment");
+
+    queue_type different_capacity_q3;
+    different_capacity_q3.set_capacity(desired_capacity * 2);
+
+    different_capacity_q3.swap(different_capacity_q2);
+    REQUIRE_MESSAGE(different_capacity_q3.capacity() == desired_capacity,
+                    "Capacity is not preserved on swap");
+    REQUIRE_MESSAGE(different_capacity_q2.capacity() == desired_capacity * 2,
+                    "Capacity is not preserved on swap");
+}