aboutsummaryrefslogtreecommitdiffstats
path: root/erts/preloaded/src
diff options
context:
space:
mode:
Diffstat (limited to 'erts/preloaded/src')
-rw-r--r--erts/preloaded/src/Makefile3
-rw-r--r--erts/preloaded/src/erts_dirty_process_code_checker.erl82
-rw-r--r--erts/preloaded/src/erts_internal.erl29
3 files changed, 111 insertions, 3 deletions
diff --git a/erts/preloaded/src/Makefile b/erts/preloaded/src/Makefile
index df4645070b..2ab9edaf5e 100644
--- a/erts/preloaded/src/Makefile
+++ b/erts/preloaded/src/Makefile
@@ -45,7 +45,8 @@ PRE_LOADED_ERL_MODULES = \
erlang \
erts_internal \
erl_tracer \
- erts_literal_area_collector
+ erts_literal_area_collector \
+ erts_dirty_process_code_checker
PRE_LOADED_BEAM_MODULES = \
prim_eval
diff --git a/erts/preloaded/src/erts_dirty_process_code_checker.erl b/erts/preloaded/src/erts_dirty_process_code_checker.erl
new file mode 100644
index 0000000000..911642082c
--- /dev/null
+++ b/erts/preloaded/src/erts_dirty_process_code_checker.erl
@@ -0,0 +1,82 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2016. All Rights Reserved.
+%%
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%% http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% %CopyrightEnd%
+%%
+
+-module(erts_dirty_process_code_checker).
+
+-export([start/0]).
+
+%%
+%% The erts_dirty_process_code_checker is started at
+%% VM boot by the VM. It is a spawned as a system
+%% process, i.e, the whole VM will terminate if
+%% this process terminates.
+%%
+start() ->
+ process_flag(trap_exit, true),
+ msg_loop().
+
+msg_loop() ->
+ _ = receive
+ Request ->
+ handle_request(Request)
+ end,
+ msg_loop().
+
+check_process(Requester, Target, ReqId, Module) ->
+ Result = erts_internal:check_dirty_process_code(Target, Module),
+ Requester ! {check_process_code, ReqId, Result}.
+
+handle_request({Requester,
+ Target,
+ Prio,
+ {check_process_code,
+ ReqId,
+ Module,
+ _Flags} = Op}) ->
+ %%
+ %% Target may have stopped executing dirty since the
+ %% initial request was made. Check its current state
+ %% and try to send the request if possible; otherwise,
+ %% check the dirty executing process and send the result...
+ %%
+ try
+ case erts_internal:is_process_executing_dirty(Target) of
+ true ->
+ check_process(Requester, Target, ReqId, Module);
+ false ->
+ case erts_internal:request_system_task(Requester,
+ Target,
+ Prio,
+ Op) of
+ ok ->
+ ok;
+ dirty_execution ->
+ check_process(Requester, Target, ReqId, Module)
+ end
+ end
+ catch
+ _ : _ ->
+ ok %% Ignore all failures; someone passed us garbage...
+ end;
+handle_request(_Garbage) ->
+ ignore.
+
+
+
diff --git a/erts/preloaded/src/erts_internal.erl b/erts/preloaded/src/erts_internal.erl
index 2a6d626279..6229754c8c 100644
--- a/erts/preloaded/src/erts_internal.erl
+++ b/erts/preloaded/src/erts_internal.erl
@@ -38,9 +38,11 @@
-export([system_check/1,
gather_system_check_result/1]).
--export([request_system_task/3]).
+-export([request_system_task/3, request_system_task/4]).
-export([check_process_code/3]).
+-export([check_dirty_process_code/2]).
+-export([is_process_executing_dirty/1]).
-export([release_literal_area_switch/0]).
-export([purge_module/2]).
@@ -204,12 +206,24 @@ port_info(_Result, _Item) ->
-spec request_system_task(Pid, Prio, Request) -> 'ok' when
Prio :: 'max' | 'high' | 'normal' | 'low',
Request :: {'garbage_collect', term()}
- | {'check_process_code', term(), module(), non_neg_integer()},
+ | {'check_process_code', term(), module(), non_neg_integer()}
+ | {'copy_literals', term(), boolean()},
Pid :: pid().
request_system_task(_Pid, _Prio, _Request) ->
erlang:nif_error(undefined).
+-spec request_system_task(RequesterPid, TargetPid, Prio, Request) -> 'ok' | 'dirty_execution' when
+ Prio :: 'max' | 'high' | 'normal' | 'low',
+ Request :: {'garbage_collect', term()}
+ | {'check_process_code', term(), module(), non_neg_integer()}
+ | {'copy_literals', term(), boolean()},
+ RequesterPid :: pid(),
+ TargetPid :: pid().
+
+request_system_task(_RequesterPid, _TargetPid, _Prio, _Request) ->
+ erlang:nif_error(undefined).
+
-define(ERTS_CPC_ALLOW_GC, (1 bsl 0)).
-spec check_process_code(Module, Flags) -> boolean() when
@@ -272,6 +286,17 @@ cpc_flags(OldFlags, Bit, true) ->
cpc_flags(OldFlags, Bit, false) ->
OldFlags band (bnot Bit).
+-spec check_dirty_process_code(Pid,Module) -> 'true' | 'false' when
+ Pid :: pid(),
+ Module :: module().
+check_dirty_process_code(_Pid,_Module) ->
+ erlang:nif_error(undefined).
+
+-spec is_process_executing_dirty(Pid) -> 'true' | 'false' when
+ Pid :: pid().
+is_process_executing_dirty(_Pid) ->
+ erlang:nif_error(undefined).
+
-spec release_literal_area_switch() -> 'true' | 'false'.
release_literal_area_switch() ->