Remove unneeded method

Fix big-O lies in docblock.

lib/Loop/Internal/TimerQueue.php

@@ -50,7 +50,7 @@ final class TimerQueue
     }
 
     /**
-     * Removes the given watcher from the queue. Time complexity: O(1).
+     * Removes the given watcher from the queue. Time complexity: O(log(n)).
      *
      * @param Watcher $watcher
      *
@@ -78,7 +78,7 @@ final class TimerQueue
     public function extract(int $now)
     {
         if (empty($this->data)) {
-            throw new \Error('No data left in the heap.');
+            return null;
         }
 
         $data = $this->data[0];
@@ -92,6 +92,16 @@ final class TimerQueue
         return $data->watcher;
     }
 
+    /**
+     * Returns the expiration time value at the top of the heap. Time complexity: O(1).
+     *
+     * @return int|null Expiration time of the watcher at the top of the heap or null if the heap is empty.
+     */
+    public function peek()
+    {
+        return isset($this->data[0]) ? $this->data[0]->expiration : -1;
+    }
+
     /**
      * @param int $node Remove the given node and then rebuild the data array from that node downward.
      *
@@ -130,28 +140,4 @@ final class TimerQueue
             $node = $swap;
         }
     }
-
-    /**
-     * Returns the expiration time value at the top of the heap. Time complexity: O(1).
-     *
-     * @return int Expiration time of the watcher at the top of the heap.
-     */
-    public function peek(): int
-    {
-        if (empty($this->data)) {
-            throw new \Error('No data in the heap.');
-        }
-
-        return $this->data[0]->expiration;
-    }
-
-    /**
-     * Determines if the heap is empty.
-     *
-     * @return  bool
-     */
-    public function isEmpty(): bool
-    {
-        return empty($this->data);
-    }
 }

lib/Loop/NativeDriver.php

@@ -100,15 +100,11 @@ class NativeDriver extends Driver
         $scheduleQueue = [];
 
         try {
-            while (!$this->timerQueue->isEmpty()) {
-                $watcher = $this->timerQueue->extract($this->now());
-
-                if ($watcher === null) { // Timer at top of queue has not expired.
-                    break;
-                }
+            $now = $this->now();
 
+            while ($watcher = $this->timerQueue->extract($now)) {
                 if ($watcher->type & Watcher::REPEAT) {
-                    $expiration = $this->now() + $watcher->value;
+                    $expiration = $now + $watcher->value;
                     $scheduleQueue[] = [$watcher, $expiration];
                 } else {
                     $this->cancel($watcher->id);
@@ -256,19 +252,15 @@ class NativeDriver extends Driver
      */
     private function getTimeout(): int
     {
-        if (!$this->timerQueue->isEmpty()) {
-            $expiration = $this->timerQueue->peek();
+        $expiration = $this->timerQueue->peek();
 
-            $expiration -= getCurrentTime() - $this->nowOffset;
-
-            if ($expiration < 0) {
-                return 0;
-            }
-
-            return $expiration;
+        if ($expiration === null) {
+            return -1;
         }
 
-        return -1;
+        $expiration -= getCurrentTime() - $this->nowOffset;
+
+        return $expiration > 0 ? $expiration : 0;
     }
 
     /**