From dcc7ecbf6af5420af2d5dbd0e97fc7a2e0e894a6 Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Sun, 9 Oct 2011 00:03:14 +0200
Subject: Use generic lock-free queue for async threads

Queues used for communication between async threads and scheduler threads
have been replaced with lock-free queues.

Drivers using the driver_async functionality are not automatically locked
to the system anymore, and can be unloaded as any dynamically linked in
driver.

Scheduling of ready async jobs is now also interleaved in between other
jobs. Previously all ready async jobs was performed at once.
---
 erts/emulator/test/driver_SUITE.erl | 77 ++++++++++++++++++++++++++++++++-----
 1 file changed, 67 insertions(+), 10 deletions(-)

(limited to 'erts/emulator/test/driver_SUITE.erl')

diff --git a/erts/emulator/test/driver_SUITE.erl b/erts/emulator/test/driver_SUITE.erl
index bcb0257ed1..c07dbc5871 100644
--- a/erts/emulator/test/driver_SUITE.erl
+++ b/erts/emulator/test/driver_SUITE.erl
@@ -76,7 +76,8 @@
 	 driver_select_use/1,
 	 thread_mseg_alloc_cache_clean/1,
 	 otp_9302/1,
-	 thr_free_drv/1]).
+	 thr_free_drv/1,
+	 async_blast/1]).
 
 -export([bin_prefix/2]).
 
@@ -145,7 +146,8 @@ all() ->
      smp_select, driver_select_use,
      thread_mseg_alloc_cache_clean,
      otp_9302,
-     thr_free_drv].
+     thr_free_drv,
+     async_blast].
 
 groups() -> 
     [{timer, [],
@@ -1911,17 +1913,30 @@ otp_9302(Config) when is_list(Config) ->
     ?line port_command(Port, ""),
     ?line {msg, block} = get_port_msg(Port, infinity),
     ?line {msg, job} = get_port_msg(Port, infinity),
-    ?line case erlang:system_info(thread_pool_size) of
-	      0 ->
-		  {msg, cancel} = get_port_msg(Port, infinity);
-	      _ ->
-		  ok
-	  end,
-    ?line {msg, job} = get_port_msg(Port, infinity),
+    ?line C = case erlang:system_info(thread_pool_size) of
+		  0 ->
+		      ?line {msg, cancel} = get_port_msg(Port, infinity),
+		      ?line {msg, job} = get_port_msg(Port, infinity),
+		      ?line false;
+		  _ ->
+		      case get_port_msg(Port, infinity) of
+			  {msg, cancel} -> %% Cancel always fail in Rel >= 15
+			      ?line {msg, job} = get_port_msg(Port, infinity),
+			      ?line false;
+			  {msg, job} ->
+			      ?line ok,
+			      ?line true
+		      end
+	      end,
     ?line {msg, end_of_jobs} = get_port_msg(Port, infinity),
     ?line no_msg = get_port_msg(Port, 2000),
     ?line port_close(Port),
-    ?line ok.
+    ?line case C of
+	      true ->
+		  ?line {comment, "Async job cancelled"};
+	      false ->
+		  ?line {comment, "Async job not cancelled"}
+	  end.
 
 thr_free_drv(Config) when is_list(Config) ->
     ?line Path = ?config(data_dir, Config),
@@ -1954,6 +1969,48 @@ thr_free_drv_control(Port, N) ->
 %	    io:format("N=~p, SID=~p", [N, erlang:system_info(scheduler_id)]),
 	    thr_free_drv_control(Port, N+1)
     end.
+	    
+async_blast(Config) when is_list(Config) ->
+    ?line Path = ?config(data_dir, Config),
+    ?line erl_ddll:start(),
+    ?line ok = load_driver(Path, async_blast_drv),
+    ?line SchedOnln = erlang:system_info(schedulers_online),
+    ?line MemBefore = driver_alloc_size(),
+    ?line Start = os:timestamp(),
+    ?line Blast = fun () ->
+			  Port = open_port({spawn, async_blast_drv}, []),
+			  true = is_port(Port),
+			  port_command(Port, ""),
+			  receive
+			      {Port, done} ->
+				  ok
+			  end,
+			  port_close(Port)
+		  end,
+    ?line Ps = lists:map(fun (N) ->
+				 spawn_opt(Blast,
+					   [{scheduler,
+					     (N rem SchedOnln)+ 1},
+					    monitor])
+			 end,
+			 lists:seq(1, 100)),
+    ?line MemMid = driver_alloc_size(),
+    ?line lists:foreach(fun ({Pid, Mon}) ->
+				receive
+				    {'DOWN',Mon,process,Pid,_} -> ok
+				end
+			end, Ps),
+    ?line End = os:timestamp(),
+    ?line MemAfter = driver_alloc_size(),
+    ?line io:format("MemBefore=~p, MemMid=~p, MemAfter=~p~n",
+		    [MemBefore, MemMid, MemAfter]),
+    ?line AsyncBlastTime = timer:now_diff(End,Start)/1000000,
+    ?line io:format("AsyncBlastTime=~p~n", [AsyncBlastTime]),
+    ?line MemBefore = MemAfter,
+    ?line erlang:display({async_blast_time, AsyncBlastTime}),
+    ?line ok.
+
+
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %% 		Utilities
-- 
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