aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/test/after_SUITE.erl
blob: 3e1a8714088003ec1a75cd65777753b9d514afb3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1997-2009. All Rights Reserved.
%% 
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%% 
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%% 
%% %CopyrightEnd%
%%

-module(after_SUITE).

%% Tests receive after.

-include("test_server.hrl").

-export([all/1, t_after/1, receive_after/1, receive_after_big/1,
	 receive_after_errors/1, receive_var_zero/1, receive_zero/1,
	 multi_timeout/1, receive_after_32bit/1]).

-export([init_per_testcase/2, fin_per_testcase/2]).

%% Internal exports.

-export([timeout_g/0]).

all(suite) ->
    [t_after, receive_after, receive_after_big, receive_after_errors,
     receive_var_zero, receive_zero, multi_timeout, receive_after_32bit].

init_per_testcase(Func, Config) when is_atom(Func), is_list(Config) ->
    Dog=?t:timetrap(?t:minutes(3)),
    [{watchdog, Dog}|Config].

fin_per_testcase(_Func, Config) ->
    Dog=?config(watchdog, Config),
    ?t:timetrap_cancel(Dog).

%% Tests for an old round-off error in 'receive after'."
t_after(Config) when is_list(Config) ->
    ?line spawn(fun frequent_process/0),
    ?line Period = test_server:minutes(1),
    ?line Before = erlang:now(),
    receive
	after Period ->
		?line After = erlang:now(),
		?line report(Period, Before, After)
	end.


report(Period, Before, After) ->
    ?line Elapsed = (element(1, After)*1000000000
		     +element(2, After)*1000
		     +element(3, After) div 1000) -
	(element(1,Before)*1000000000
	 + element(2,Before)*1000 + element(3,Before) div 1000),
    ?line case Elapsed*100 / Period of
	      Percent when Percent > 100.10 ->
		  ?line test_server:fail({too_inaccurate, Percent});
	      Percent when Percent < 100.0 ->
		  ?line test_server:fail({too_early, Percent});
	      Percent ->
		  ?line Comment = io_lib:format("Elapsed/expected: ~.2f %",
						[Percent]),
		  {comment, lists:flatten(Comment)}
	  end.

frequent_process() ->
    receive
	after 100 ->
		?line frequent_process()
	end.

receive_after(doc) ->
    "Test that 'receive after' works (doesn't hang). "
    "The test takes 10 seconds to complete.";
receive_after(Config) when is_list(Config) ->
    ?line receive_after1(5000).

receive_after1(1) ->
    ?line io:format("Testing: receive after ~p~n", [1]), 
    ?line receive after 1 -> ok end;
receive_after1(N) -> 
    ?line io:format("Testing: receive after ~p~n", [N]), 
    ?line receive after N -> receive_after1(N div 2) end.

receive_after_big(Config) when is_list(Config) ->
    %% Test that 'receive after' with a 32 bit number works.
    receive_after_big1(16#f7654321),
    receive_after_big2().

receive_after_big1(Timeout) ->
    Self = self(),
    erlang:yield(),
    spawn(fun() -> Self ! here_is_a_message end),
    ok = receive
	     here_is_a_message ->
		 ok
	 after Timeout ->
		 %% We test that the timeout can be set,
		 %% not that an timeout occurs after the appropriate delay
		 %% (48 days, 56 minutes, 48 seconds)!
		 timeout
	 end.

receive_after_big2() ->
    Self = self(),
    erlang:yield(),
    spawn(fun() -> Self ! here_is_a_message end),
    ok = receive
	     here_is_a_message ->
		 ok
	 after 16#f7999977 ->
		 %% We only test that the timeout can be set.
		 timeout
	 end.

-define(TryAfter(Timeout), 
	{'EXIT',{timeout_value,_}} = (catch receive mission -> exit(impossible) after Timeout -> ok end),
	{'EXIT',{timeout_value,_}} = (catch receive after Timeout -> ok end),
	try_after(Timeout)).

%% Test error cases for 'receive after'.
receive_after_errors(Config) when is_list(Config) ->
    ?line ?TryAfter(-1),
    ?line ?TryAfter(0.0),
    ?line ?TryAfter(3.14),
    ?line ?TryAfter(16#100000000),
    ?line ?TryAfter(392347129847294724972398472984729847129874),
    ?line ?TryAfter(16#3fffffffffffffff),
    ?line ?TryAfter(16#ffffffffffffffff),
    ?line ?TryAfter(-16#100000000),
    ?line ?TryAfter(-3891278094774921784123987129848),
    ?line ?TryAfter(xxx),
    ok.

try_after(Timeout) ->
    {'EXIT',{timeout_value,_}} = (catch receive after Timeout -> ok end).

receive_var_zero(doc) -> "Test 'after Z', when Z == 0.";
receive_var_zero(Config) when is_list(Config) ->
    self() ! x,
    self() ! y,
    Z = zero(),
    timeout = receive
		  z -> ok
	      after Z -> timeout
	      end,
    timeout = receive
	      after Z -> timeout
	      end,
    self() ! w,
    receive
	x -> ok;
	Other ->
	    ?line ?t:fail({bad_message,Other})
    end.

zero() -> 0.

%% Test 'after 0'.
receive_zero(Config) when is_list(Config) ->
    self() ! x,
    self() ! y,
    timeout = receive
		  z -> ok
	      after 0 ->
		      timeout
	      end,
    self() ! w,
    timeout = receive
              after 0 -> timeout
              end,
    receive
	x -> ok;
	Other ->
	    ?line ?t:fail({bad_message,Other})
    end.

multi_timeout(doc) ->
    "Test for catching invalid assertion in erl_message.c (in queue_message)."
    "This failed (dumped core) with debug-compiled emulator.";
multi_timeout(Config) when is_list(Config) ->
    ?line P = spawn(?MODULE, timeout_g, []),
    ?line P ! a,
    ?line P ! b,
    ?line receive
	  after 1000 -> ok
	  end,
    ?line P ! c,
    ?line receive
	  after 1000 -> ok
	  end,
    ?line P ! d,
    ok.

timeout_g() ->
    ?line receive
	a -> ok
    end,
    ?line receive
	  after 100000 -> ok
	  end,
    ok.

%% OTP-7493: Timeout for 32 bit numbers (such as 16#ffffFFFF) could
%% timeout at once.
receive_after_32bit(Config) when is_list(Config) ->
    T = 16#ffffFFFF,
    Pids = [spawn_link(fun() -> recv_after_32bit(I, T) end) ||
	       I <- lists:seq(1, 2048)],

    %% Wait two seconds for any of the processes to timeout too early.
    receive after 2000 -> ok end,

    %% Kill the processes.
    [begin unlink(Pid), exit(Pid, kill) end || Pid <- Pids],
    ok.

recv_after_32bit(I, T) when I rem 2 =:= 0 ->
    receive after T -> exit(timeout) end;
recv_after_32bit(_, _) ->
    receive after 16#ffffFFFF -> exit(timeout) end.