diff --git a/src/mm_call.c b/src/mm_call.c
index a10873d7..ee799886 100644
--- a/src/mm_call.c
+++ b/src/mm_call.c
@@ -14,7 +14,8 @@ mm_call_timer_cb(mm_timer_t *handle)
 	mm_call_t *call = handle->arg;
 	call->timedout = 1;
 	call->status = ETIMEDOUT;
-	mm_scheduler_wakeup(call->fiber);
+	if (call->fiber)
+		mm_scheduler_wakeup(call->fiber);
 }
 
 static void
@@ -23,7 +24,8 @@ mm_call_cancel_cb(void *obj, void *arg)
 	mm_call_t *call = arg;
 	(void)obj;
 	call->status = ECANCELED;
-	mm_scheduler_wakeup(call->fiber);
+	if (call->fiber)
+		mm_scheduler_wakeup(call->fiber);
 }
 
 void
@@ -55,3 +57,30 @@ mm_call(mm_call_t *call,
 	call->arg = NULL;
 	fiber->call_ptr = NULL;
 }
+
+void
+mm_call_fast(mm_call_t *call,
+             mm_scheduler_t *scheduler,
+             void (*function)(void*),
+             void *arg)
+{
+	mm_fiber_t *fiber;
+	fiber = mm_scheduler_current(scheduler);
+	if (mm_fiber_is_cancelled(fiber))
+		return;
+
+	fiber->call_ptr = call;
+	call->fiber = fiber;
+	call->active = 1;
+	call->cancel_function = mm_call_cancel_cb;
+	call->arg = call;
+	call->timedout = 0;
+	call->status = 0;
+
+	function(arg);
+
+	call->active = 0;
+	call->cancel_function = NULL;
+	call->arg = NULL;
+	fiber->call_ptr = NULL;
+}
diff --git a/src/mm_call.h b/src/mm_call.h
index 1a8ec8b9..5cc52858 100644
--- a/src/mm_call.h
+++ b/src/mm_call.h
@@ -22,6 +22,7 @@ struct mm_call_t {
 };
 
 void mm_call(mm_call_t*, mm_scheduler_t*, mm_clock_t*, int);
+void mm_call_fast(mm_call_t*, mm_scheduler_t*, void (*)(void*), void*);
 
 static inline int
 mm_call_is_active(mm_call_t *call)
diff --git a/src/mm_read.c b/src/mm_read.c
index d0869d08..cff2ac11 100644
--- a/src/mm_read.c
+++ b/src/mm_read.c
@@ -53,20 +53,18 @@ static int
 mm_read_default(mm_io_t *io, uint64_t time_ms)
 {
 	mm_t *machine = machine = io->machine;
-
 	io->read_eof = 0;
-
-#if 0
 	io->handle.on_read = mm_read_cb;
 	io->handle.on_read_arg = io;
-	mm_read_cb(&io->handle);
-	if (io->read_status != 0) {
-		mm_io_set_errno(io, io->read_status);
+	mm_call_fast(&io->write, &machine->scheduler,
+	             (void(*)(void*))mm_read_cb,
+	             &io->handle);
+	if (io->read.status != 0) {
+		mm_io_set_errno(io, io->read.status);
 		return -1;
 	}
 	if (io->read_pos == io->read_size)
 		return 0;
-#endif
 
 	/* subscribe for read event */
 	int rc;
diff --git a/src/mm_write.c b/src/mm_write.c
index 363d316c..67279c2e 100644
--- a/src/mm_write.c
+++ b/src/mm_write.c
@@ -64,17 +64,17 @@ mm_write(mm_io_t *io, char *buf, int size, uint64_t time_ms)
 	io->write_size = size;
 	io->write_pos  = 0;
 
-#if 0
 	io->handle.on_write = mm_write_cb;
 	io->handle.on_write_arg = io;
-	mm_write_cb(&io->handle);
+	mm_call_fast(&io->write, &machine->scheduler,
+	             (void(*)(void*))mm_write_cb,
+	             &io->handle);
 	if (io->write.status != 0) {
 		mm_io_set_errno(io, io->write.status);
 		return -1;
 	}
 	if (io->write_pos == io->write_size)
 		return 0;
-#endif
 
 	/* subscribe for write event */
 	int rc;