Clean up code for queue (no logic changed)

Author: gingerBill

src/queue.cpp

@@ -71,15 +71,39 @@ void mpmc_destroy(MPMCQueue<T> *q) {
 }
 
 
+template <typename T>
+bool mpmc_internal_grow(MPMCQueue<T> *q) {
+	mutex_lock(&q->mutex);
+	i32 old_size = q->mask+1;
+	i32 new_size = old_size*2;
+	resize_array_raw(&q->nodes, q->allocator, old_size, new_size);
+	if (q->nodes == nullptr) {
+		GB_PANIC("Unable to resize enqueue: %td -> %td", old_size, new_size);
+		mutex_unlock(&q->mutex);
+		return false;
+	}
+	resize_array_raw(&q->indices, q->allocator, old_size, new_size);
+	if (q->indices == nullptr) {
+		GB_PANIC("Unable to resize enqueue: %td -> %td", old_size, new_size);
+		mutex_unlock(&q->mutex);
+		return false;
+	}
+	mpmc_internal_init_indices(q->indices, old_size, new_size);
+	q->mask = new_size-1;
+	mutex_unlock(&q->mutex);
+	return true;
+}
+
 template <typename T>
 i32 mpmc_enqueue(MPMCQueue<T> *q, T const &data) {
 	GB_ASSERT(q->mask != 0);
 
 	i32 head_idx = q->head_idx.load(std::memory_order_relaxed);
 
 	for (;;) {
-		auto node = &q->nodes[head_idx & q->mask];
-		auto node_idx_ptr = &q->indices[head_idx & q->mask];
+		i32 index = head_idx & q->mask;
+		auto node = &q->nodes[index];
+		auto node_idx_ptr = &q->indices[index];
 		i32 node_idx = node_idx_ptr->load(std::memory_order_acquire);
 		i32 diff = node_idx - head_idx;
 
@@ -91,24 +115,9 @@ i32 mpmc_enqueue(MPMCQueue<T> *q, T const &data) {
 				return q->count.fetch_add(1, std::memory_order_release);
 			}
 		} else if (diff < 0) {
-			mutex_lock(&q->mutex);
-			i32 old_size = q->mask+1;
-			i32 new_size = old_size*2;
-			resize_array_raw(&q->nodes, q->allocator, old_size, new_size);
-			if (q->nodes == nullptr) {
-				GB_PANIC("Unable to resize enqueue: %td -> %td", old_size, new_size);
-				mutex_unlock(&q->mutex);
-				return -1;
-			}
-			resize_array_raw(&q->indices, q->allocator, old_size, new_size);
-			if (q->indices == nullptr) {
-				GB_PANIC("Unable to resize enqueue: %td -> %td", old_size, new_size);
-				mutex_unlock(&q->mutex);
+			if (!mpmc_internal_grow(q)) {
 				return -1;
 			}
-			mpmc_internal_init_indices(q->indices, old_size, new_size);
-			q->mask = new_size-1;
-			mutex_unlock(&q->mutex);
 		} else {
 			head_idx = q->head_idx.load(std::memory_order_relaxed);
 		}