diff --git a/easypy/concurrency.py b/easypy/concurrency.py
index 8374a540..d7781618 100644
--- a/easypy/concurrency.py
+++ b/easypy/concurrency.py
@@ -87,6 +87,7 @@
 from easypy.units import MINUTE, HOUR
 from easypy.colors import colorize, uncolored
 from easypy.sync import SynchronizationCoordinator, ProcessExiting, raise_in_main_thread
+from easypy.decorations import parametrizeable_decorator
 
 
 MAX_THREAD_POOL_SIZE = int(os.environ.get('EASYPY_MAX_THREAD_POOL_SIZE', 50))
@@ -210,6 +211,7 @@ class MultiException(PException, metaclass=MultiExceptionMeta):
     :param complete: ``True`` if all threads failed on exception
     """
 
+    COMMON_TYPE = BaseException  # the fallback common type
     template = "{0.common_type.__qualname__} raised from concurrent invocation (x{0.count}/{0.invocations_count})"
 
     def __reduce__(self):
@@ -892,7 +894,7 @@ def concestor(*cls_list):
     return object  # the base-class that rules the all
 
 
-class concurrent(object):
+class _concurrent(object):
     """
     Higher-level thread execution.
 
@@ -972,7 +974,8 @@ def __repr__(self):
             flags += 'T'
         return "<%s[%s] '%s'>" % (self.__class__.__name__, self.threadname, flags)
 
-    def _logged_func(self):
+    def _logged_func(self, kwargs=None):
+        kwargs = {**self.kwargs, **(kwargs or {})}
         stack = ExitStack()
         self.exc = None
         self.timer = Timer()
@@ -983,7 +986,7 @@ def _logged_func(self):
                 stack.enter_context(_logger.suppressed())
             _logger.debug("%s - starting", self)
             while True:
-                self._result = self.func(*self.args, **self.kwargs)
+                self._result = self.func(*self.args, **kwargs)
                 if not self.loop:
                     return
                 if self.wait(self.sleep):
@@ -1004,7 +1007,8 @@ def _logged_func(self):
             stack.close()
 
     def stop(self):
-        _logger.debug("%s - stopping", self)
+        if not self.stopper.is_set():
+            _logger.debug("%s - stopping", self)
         self.stopper.set()
 
     def wait(self, timeout=None):
@@ -1014,12 +1018,16 @@ def wait(self, timeout=None):
             while not timer.expired:
                 if self.stopper.is_set():
                     return True
-                non_gevent_sleep(0.1)
+                if IS_GEVENT:
+                    time.sleep(0.1)
+                else:
+                    non_gevent_sleep(0.1)
             return False
         return self.stopper.wait(timeout)
 
     def result(self, timeout=None):
-        self.wait(timeout=timeout)
+        if not self.wait(timeout=timeout):
+            raise TimeoutError()
         if self.throw and self.exc:
             raise self.exc
         return self._result
@@ -1037,18 +1045,20 @@ def paused(self):
         self.start()
 
     @contextmanager
-    def _running(self):
+    def _running(self, *args, **kwargs):
+        func = lambda *args, **kwargs: self._logged_func(*args, **kwargs)
+
         if DISABLE_CONCURRENCY:
-            self._logged_func()
+            self._logged_func(*args, **kwargs)
             yield self
             return
 
         if self.real_thread_no_greenlet and IS_GEVENT:
             _logger.debug('sending job to a real OS thread')
-            self._join = defer_to_thread(func=self._logged_func, threadname=self.threadname)
+            self._join = defer_to_thread(func=func, threadname=self.threadname)
         else:
             # threading.Thread could be a real thread or a gevent-patched thread...
-            self.thread = threading.Thread(target=self._logged_func, name=self.threadname, daemon=self.daemon)
+            self.thread = threading.Thread(target=func, name=self.threadname, daemon=self.daemon)
             _logger.debug('sending job to %s', self.thread)
             self.stopper.clear()
             self.thread.start()
@@ -1061,12 +1071,24 @@ def _running(self):
         if self.throw and self.exc:
             raise self.exc
 
-    def __enter__(self):
-        self._ctx = self._running()
+    def start(self, *args, **kwargs):
+        self._ctx = self._running(*args, **kwargs)
         return self._ctx.__enter__()
 
+    def join(self):
+        self.__exit__(None, None, None)
+
+    __enter__ = start
+
     def __exit__(self, *args):
-        return self._ctx.__exit__(*args)
+        if not self._ctx:
+            return
+        try:
+            return self._ctx.__exit__(*args)
+        finally:
+            self._ctx = None
+
+    __del__ = join
 
     def __iter__(self):
         # TODO: document or remove
@@ -1076,12 +1098,16 @@ def __iter__(self):
                 yield self
                 self.iterations += 1
 
-    start = __enter__
+    def __call__(self, *args, timeout_=None, **kwargs):
+        self.start(*args, **kwargs)
+        if not self.wait(timeout=timeout_):
+            raise TimeoutError()
+        return self.result()
 
-    def join(self):
-        self.__exit__(None, None, None)
 
-    __del__ = join
+@parametrizeable_decorator
+def concurrent(func=None, *args, **kwargs):
+    return _concurrent(func, *args, **kwargs)
 
 
 # re-exports
diff --git a/easypy/decorations.py b/easypy/decorations.py
index dd6bc45d..a454af67 100644
--- a/easypy/decorations.py
+++ b/easypy/decorations.py
@@ -12,11 +12,11 @@
 
 def parametrizeable_decorator(deco):
     @wraps(deco)
-    def inner(func=None, **kwargs):
+    def inner(func=None, *args, **kwargs):
         if func is None:
-            return partial(deco, **kwargs)
+            return partial(deco, *args, **kwargs)
         else:
-            return wraps(func)(deco(func, **kwargs))
+            return wraps(func)(deco(func, *args, **kwargs))
     return inner
 
 
diff --git a/tests/test_concurrency.py b/tests/test_concurrency.py
index 3e8ebb06..04392334 100644
--- a/tests/test_concurrency.py
+++ b/tests/test_concurrency.py
@@ -24,6 +24,18 @@ def test_thread_stacks():
         print(get_thread_stacks().render())
 
 
+def test_call_concurrent():
+    func = lambda a, b: a + b
+    c = concurrent(func, 1, b=2, threadname='add')
+    assert c() == 3
+
+
+def test_call_concurrent_timeout():
+    c = concurrent(sleep, 1, threadname='sleep')
+    with pytest.raises(TimeoutError):
+        c(timeout_=0.1)
+
+
 def test_thread_contexts_counters():
     TC = ThreadContexts(counters=('i', 'j'))
     assert TC.i == TC.j == 0