Revert "Synchronize via MTLSharedEvents (#633)"

This reverts commit 1942968.

Author: christiangnrd

lib/mtl/events.jl

@@ -29,10 +29,6 @@ function MTLSharedEvent(dev::MTLDevice)
     return obj
 end
 
-function waitUntilSignaledValue(ev::MTLSharedEvent, value, timeoutMS=typemax(UInt64))
-    @objc [ev::id{MTLSharedEvent} waitUntilSignaledValue:value::UInt64
-                        timeoutMS:timeoutMS::UInt64]::Bool
-end
 
 ## shared event handle
 

src/state.jl

@@ -55,17 +55,6 @@ function global_queue(dev::MTLDevice)
     end::MTLCommandQueue
 end
 
-"""
-    queue_event(queue::MTLCommandQueue)::MTLSharedEvent
-
-Return the `MTLSharedEvent` used to synchronize a queue
-"""
-function queue_event(queue::MTLCommandQueue)
-    get!(task_local_storage(), (:MTLSharedEvent, queue)) do
-        MTLSharedEvent(queue.device)
-    end::MTLSharedEvent
-end
-
 # TODO: Increase performance (currently ~15us)
 """
     synchronize(queue)
@@ -77,13 +66,9 @@ and simply wait for it to be completed. Since command buffers *should* execute i
 First-In-First-Out manner, this synchronizes the GPU.
 """
 @autoreleasepool function synchronize(queue::MTLCommandQueue=global_queue(device()))
-    ev = queue_event(queue)
-    val = ev.signaledValue + 1
     cmdbuf = MTLCommandBuffer(queue)
-    MTL.encode_signal!(cmdbuf, ev, val)
     commit!(cmdbuf)
-    MTL.waitUntilSignaledValue(ev,val)
-    return
+    wait_completed(cmdbuf)
 end
 
 """