diff --git a/lib/Internal/EmitSource.php b/lib/Internal/EmitSource.php
index a225201..f9f1251 100644
--- a/lib/Internal/EmitSource.php
+++ b/lib/Internal/EmitSource.php
@@ -136,7 +136,7 @@ final class EmitSource
 
         // No value has been emitted, suspend fiber to await next value.
         $this->waiting[$position] = \Fiber::this();
-        return \Fiber::suspend(Loop::getDriver());
+        return \Fiber::suspend(Loop::getScheduler());
     }
 
     public function pipe(): Pipeline
@@ -302,7 +302,7 @@ final class EmitSource
 
         if ($pair === null) {
             $this->yielding[$position] = \Fiber::this();
-            return \Fiber::suspend(Loop::getDriver());
+            return \Fiber::suspend(Loop::getScheduler());
         }
 
         [$exception, $value] = $pair;
diff --git a/lib/Loop.php b/lib/Loop.php
index 049a7ec..c426dd7 100644
--- a/lib/Loop.php
+++ b/lib/Loop.php
@@ -388,6 +388,16 @@ final class Loop
     {
         return self::$driver;
     }
+
+    /**
+     * Retrieve the active {@see FiberScheduler} instance associated with the event loop driver.
+     *
+     * @return \FiberScheduler
+     */
+    public static function getScheduler(): \FiberScheduler
+    {
+        return self::$driver->getScheduler();
+    }
 }
 
 // Default factory, don't move this to a file loaded by the composer "files" autoload mechanism, otherwise custom
diff --git a/lib/Loop/Driver.php b/lib/Loop/Driver.php
index 802de72..dbe1a0d 100644
--- a/lib/Loop/Driver.php
+++ b/lib/Loop/Driver.php
@@ -2,8 +2,15 @@
 
 namespace Amp\Loop;
 
-interface Driver extends \FiberScheduler
+interface Driver
 {
+    /**
+     * Get the fiber scheduler associated with this driver.
+     *
+     * @return \FiberScheduler
+     */
+    public function getScheduler(): \FiberScheduler;
+
     /**
      * Run the event loop.
      *
@@ -18,6 +25,8 @@ interface Driver extends \FiberScheduler
      * error handler or exceptions that would be passed to an error handler but none exists to handle them.
      *
      * @return void
+     *
+     * @throw \Error Thrown if the event loop is already running.
      */
     public function run(): void;
 
diff --git a/lib/Loop/DriverFoundation.php b/lib/Loop/DriverFoundation.php
index f868659..ff64894 100644
--- a/lib/Loop/DriverFoundation.php
+++ b/lib/Loop/DriverFoundation.php
@@ -41,6 +41,22 @@ abstract class DriverFoundation implements Driver
 
     private bool $running = false;
 
+    private \FiberScheduler $scheduler;
+
+    /**
+     * Get the fiber scheduler associated with this driver.
+     *
+     * @return \FiberScheduler
+     */
+    public function getScheduler(): \FiberScheduler
+    {
+        if (!isset($this->scheduler) || $this->scheduler->isTerminated()) {
+            $this->scheduler = new \FiberScheduler(fn() => $this->run());
+        }
+
+        return $this->scheduler;
+    }
+
     /**
      * Run the event loop.
      *
@@ -55,6 +71,8 @@ abstract class DriverFoundation implements Driver
      * error handler or exceptions that would be passed to an error handler but none exists to handle them.
      *
      * @return void
+     *
+     * @throw \Error Thrown if the event loop is already running.
      */
     public function run(): void
     {
diff --git a/lib/Loop/TracingDriver.php b/lib/Loop/TracingDriver.php
index d3d841f..3972a5d 100644
--- a/lib/Loop/TracingDriver.php
+++ b/lib/Loop/TracingDriver.php
@@ -25,6 +25,11 @@ final class TracingDriver implements Driver
         $this->driver = $driver;
     }
 
+    public function getScheduler(): \FiberScheduler
+    {
+        return $this->driver->getScheduler();
+    }
+
     public function run(): void
     {
         $this->driver->run();
diff --git a/lib/functions.php b/lib/functions.php
index d031f07..eb7c7b1 100644
--- a/lib/functions.php
+++ b/lib/functions.php
@@ -34,7 +34,7 @@ namespace Amp
             }
         );
 
-        return \Fiber::suspend(Loop::getDriver());
+        return \Fiber::suspend(Loop::getScheduler());
     }
 
     /**
@@ -226,7 +226,7 @@ namespace Amp
     {
         $fiber = \Fiber::this();
         Loop::delay($milliseconds, fn() => $fiber->resume());
-        \Fiber::suspend(Loop::getDriver());
+        \Fiber::suspend(Loop::getScheduler());
     }
 
     /**
@@ -255,7 +255,7 @@ namespace Amp
             $watchers[] = Loop::onSignal($signal, $callback);
         }
 
-        return \Fiber::suspend(Loop::getDriver());
+        return \Fiber::suspend(Loop::getScheduler());
     }
 
     /**
diff --git a/stubs/Fiber.php b/stubs/Fiber.php
index a4a016e..0695dd6 100644
--- a/stubs/Fiber.php
+++ b/stubs/Fiber.php
@@ -10,7 +10,7 @@ final class Fiber
     /**
      * Starts execution of the fiber. Returns when the fiber suspends or terminates.
      *
-     * Must be called within {@see FiberScheduler::run()}.
+     * Must be called within a {@see FiberScheduler}.
      *
      * @param mixed ...$args Arguments passed to fiber function.
      *
@@ -23,7 +23,7 @@ final class Fiber
      * Resumes the fiber, returning the given value from {@see Fiber::suspend()}.
      * Returns when the fiber suspends or terminates.
      *
-     * Must be called within {@see FiberScheduler::run()}.
+     * Must be called within a {@see FiberScheduler}.
      *
      * @param mixed $value
      *
@@ -36,7 +36,7 @@ final class Fiber
      * Throws the given exception into the fiber from {@see Fiber::suspend()}.
      * Returns when the fiber suspends or terminates.
      *
-     * Must be called within {@see FiberScheduler::run()}.
+     * Must be called within a {@see FiberScheduler}.
      *
      * @param Throwable $exception
      *
@@ -68,19 +68,19 @@ final class Fiber
     /**
      * Returns the currently executing Fiber instance.
      *
-     * Cannot be called within {@see FiberScheduler::run()}.
+     * Cannot be called within {@see FiberScheduler}.
      *
      * @return self The currently executing fiber.
      *
-     * @throws FiberError Thrown if within {@see FiberScheduler::run()}.
+     * @throws FiberError Thrown if within {@see FiberScheduler}.
      */
     public static function this(): self { }
 
     /**
      * Suspend execution of the fiber. The fiber may be resumed with {@see Fiber::resume()} or {@see Fiber::throw()}
-     * within the run() method of the instance of {@see FiberScheduler} given.
+     * within the callback used to create the {@see FiberScheduler} given.
      *
-     * Cannot be called within {@see FiberScheduler::run()}.
+     * Cannot be called within a {@see FiberScheduler}.
      *
      * @param FiberScheduler $scheduler
      *
diff --git a/stubs/FiberScheduler.php b/stubs/FiberScheduler.php
index 237844a..2989228 100644
--- a/stubs/FiberScheduler.php
+++ b/stubs/FiberScheduler.php
@@ -1,9 +1,29 @@
 <?php
 
-interface FiberScheduler
+final class FiberScheduler
 {
     /**
-     * Run the scheduler.
+     * @param callable $callback Function to invoke when starting the fiber scheduler.
      */
-    public function run(): void;
+    public function __construct(callable $callback) { }
+
+    /**
+     * @return bool True if the fiber has been started.
+     */
+    public function isStarted(): bool { }
+
+    /**
+     * @return bool True if the fiber is suspended.
+     */
+    public function isSuspended(): bool { }
+
+    /**
+     * @return bool True if the fiber is currently running.
+     */
+    public function isRunning(): bool { }
+
+    /**
+     * @return bool True if the fiber has completed execution.
+     */
+    public function isTerminated(): bool { }
 }
diff --git a/stubs/ReflectionFiberScheduler.php b/stubs/ReflectionFiberScheduler.php
index ec45864..11dd5a6 100644
--- a/stubs/ReflectionFiberScheduler.php
+++ b/stubs/ReflectionFiberScheduler.php
@@ -6,9 +6,4 @@ class ReflectionFiberScheduler extends ReflectionFiber
      * @param FiberScheduler $scheduler
      */
     public function __construct(FiberScheduler $scheduler) { }
-
-    /**
-     * @return FiberScheduler The instance used to create the fiber.
-     */
-    public function getScheduler(): FiberScheduler { }
 }
diff --git a/test/Loop/DriverTest.php b/test/Loop/DriverTest.php
index a6abeb0..f1387e6 100644
--- a/test/Loop/DriverTest.php
+++ b/test/Loop/DriverTest.php
@@ -28,17 +28,11 @@ abstract class DriverTest extends TestCase
      */
     abstract public function getFactory(): callable;
 
-    /** @var Driver */
     public Driver $loop;
 
     public function setUp(): void
     {
         $this->loop = ($this->getFactory())();
-
-        if (!$this->loop instanceof Driver) {
-            $this->fail("Factory did not return a loop Driver");
-        }
-
         \gc_collect_cycles();
     }