~extract method

Author: qwwdfsad

kotlinx-coroutines-core/jvm/src/scheduling/WorkQueue.kt

@@ -150,18 +150,25 @@ internal class WorkQueue {
         var end = producerIndex.value
 
         while (start != end) {
-            --end
-            val index = end and MASK
-            if (blockingTasksInBuffer.value == 0) break
-            val value = buffer[index]
-            if (value != null && value.isBlocking && buffer.compareAndSet(index, value, null)) {
-                blockingTasksInBuffer.decrementAndGet()
-                return value
+            val task = tryExtractBlockingTask(--end)
+            if (task != null) {
+                return task
             }
         }
         return null
     }
 
+    private fun tryExtractBlockingTask(index: Int): Task? {
+        if (blockingTasksInBuffer.value == 0) return null
+        val arrayIndex = index and MASK
+        val value = buffer[arrayIndex]
+        if (value != null && value.isBlocking && buffer.compareAndSet(arrayIndex, value, null)) {
+            blockingTasksInBuffer.decrementAndGet()
+            return value
+        }
+        return null
+    }
+
     fun offloadAllWorkTo(globalQueue: GlobalQueue) {
         lastScheduledTask.getAndSet(null)?.let { globalQueue.addLast(it) }
         while (pollTo(globalQueue)) {