Cap min timer interval at 1µs, thus improving compatibility with v0.4

LibEventLoop.php

@@ -8,6 +8,7 @@
 
 class LibEventLoop implements LoopInterface
 {
+    /** @deprecated unused, left here for BC only */
     const MIN_TIMER_RESOLUTION = 0.001;
 
     private $base;
@@ -150,10 +151,6 @@ public function removeStream($stream)
 
     protected function addTimerInternal($interval, $callback, $periodic = false)
     {
-        if ($interval < self::MIN_TIMER_RESOLUTION) {
-            throw new \InvalidArgumentException('Timer events do not support sub-millisecond timeouts.');
-        }
-
         $timer = new Timer($this, $interval, $callback, $periodic);
         $resource = event_new();
 
@@ -174,7 +171,7 @@ protected function addTimerInternal($interval, $callback, $periodic = false)
 
         event_timer_set($resource, $callback);
         event_base_set($resource, $this->base);
-        event_add($resource, $interval * 1000000);
+        event_add($resource, $timer->getInterval() * 1000000);
 
         return $timer;
     }

Timer/Timer.php

@@ -7,6 +7,8 @@
 
 class Timer implements TimerInterface
 {
+    const MIN_INTERVAL = 0.000001;
+
     protected $loop;
     protected $interval;
     protected $callback;
@@ -19,6 +21,10 @@ public function __construct(LoopInterface $loop, $interval, $callback, $periodic
             throw new InvalidArgumentException('The callback argument must be a valid callable object');
         }
 
+        if ($interval < self::MIN_INTERVAL) {
+            $interval = self::MIN_INTERVAL;
+        }
+
         $this->loop = $loop;
         $this->interval = (float) $interval;
         $this->callback = $callback;

Timer/Timers.php

@@ -8,6 +8,7 @@
 
 class Timers
 {
+    /** @deprecated unused, left here for BC only */
     const MIN_RESOLUTION = 0.001;
 
     private $time;
@@ -33,11 +34,6 @@ public function getTime()
     public function add(TimerInterface $timer)
     {
         $interval = $timer->getInterval();
-
-        if ($interval < self::MIN_RESOLUTION) {
-            throw new InvalidArgumentException('Timer events do not support sub-millisecond timeouts.');
-        }
-
         $scheduledAt = $interval + $this->getTime();
 
         $this->timers->attach($timer, $scheduledAt);