Mercurial > hg > CbC > CbC_gcc
comparison gcc/testsuite/ada/acats/tests/c9/c954a01.a @ 111:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
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1 -- C954A01.A | |
2 -- | |
3 -- Grant of Unlimited Rights | |
4 -- | |
5 -- Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687, | |
6 -- F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained | |
7 -- unlimited rights in the software and documentation contained herein. | |
8 -- Unlimited rights are defined in DFAR 252.227-7013(a)(19). By making | |
9 -- this public release, the Government intends to confer upon all | |
10 -- recipients unlimited rights equal to those held by the Government. | |
11 -- These rights include rights to use, duplicate, release or disclose the | |
12 -- released technical data and computer software in whole or in part, in | |
13 -- any manner and for any purpose whatsoever, and to have or permit others | |
14 -- to do so. | |
15 -- | |
16 -- DISCLAIMER | |
17 -- | |
18 -- ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR | |
19 -- DISCLOSED ARE AS IS. THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED | |
20 -- WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE | |
21 -- SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE | |
22 -- OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A | |
23 -- PARTICULAR PURPOSE OF SAID MATERIAL. | |
24 --* | |
25 -- | |
26 -- OBJECTIVE: | |
27 -- Check that if a task requeued without abort on a protected entry queue | |
28 -- is aborted, the abort is deferred until the entry call completes, | |
29 -- after which the task becomes completed. | |
30 -- | |
31 -- TEST DESCRIPTION: | |
32 -- Declare a protected type which simulates a printer device driver | |
33 -- (foundation code). | |
34 -- | |
35 -- Declare a task which simulates a printer server for multiple printers. | |
36 -- | |
37 -- For the protected type, declare an entry with a barrier that is set | |
38 -- false by a protected procedure (which simulates starting a print job | |
39 -- on the printer), and is set true by a second protected procedure (which | |
40 -- simulates a handler called when the printer interrupts, indicating | |
41 -- that printing is done). | |
42 -- | |
43 -- For the task, declare an entry whose corresponding accept statement | |
44 -- contains a call to first protected procedure of the protected type | |
45 -- (which sets the barrier of the protected entry to false), followed by | |
46 -- a requeue with abort to the protected entry. Declare a second entry | |
47 -- which does nothing. | |
48 -- | |
49 -- Declare a "requesting" task which calls the printer server task entry | |
50 -- (and thus executes the requeue). Attempt to abort the requesting | |
51 -- task. Verify that it is not aborted. Call the second protected | |
52 -- procedure of the protected type (the interrupt handler) and verify that | |
53 -- the protected entry completes for the requesting task. Verify that | |
54 -- the requesting task is then aborted. | |
55 -- | |
56 -- TEST FILES: | |
57 -- This test depends on the following foundation code: | |
58 -- | |
59 -- F954A00.A | |
60 -- | |
61 -- | |
62 -- CHANGE HISTORY: | |
63 -- 06 Dec 94 SAIC ACVC 2.0 | |
64 -- 10 Oct 96 SAIC Added pragma elaborate. | |
65 -- | |
66 --! | |
67 | |
68 package C954A01_0 is -- Printer server abstraction. | |
69 | |
70 -- Simulate a system with multiple printers. The entry Print requests | |
71 -- that data be printed on the next available printer. The entry call | |
72 -- is accepted when a printer is available, and completes when printing | |
73 -- is done. | |
74 | |
75 | |
76 task Printer_Server is | |
77 entry Print (File_Name : String); -- Test the requeue statement. | |
78 entry Verify_Results; -- Artifice for test purposes. | |
79 end Printer_Server; | |
80 | |
81 end C954A01_0; | |
82 | |
83 | |
84 --==================================================================-- | |
85 | |
86 | |
87 with Report; | |
88 with ImpDef; | |
89 | |
90 with F954A00; -- Printer device abstraction. | |
91 use F954A00; | |
92 pragma Elaborate(F954A00); | |
93 | |
94 package body C954A01_0 is -- Printer server abstraction. | |
95 | |
96 task body Printer_Server is | |
97 Printers_Busy : Boolean := True; | |
98 Index : Printer_ID := 1; | |
99 Print_Accepted : Boolean := False; | |
100 begin | |
101 | |
102 loop | |
103 -- Wait for a printer to become available: | |
104 | |
105 while Printers_Busy loop | |
106 Printers_Busy := False; -- Exit loop if | |
107 -- entry accepted. | |
108 select | |
109 Printer(Index).Done_Printing; -- Accepted immed. | |
110 -- when printer is | |
111 -- available. | |
112 else | |
113 Index := 1 + (Index mod Number_Of_Printers);-- Entry not immed. | |
114 Printers_Busy := True; -- accepted; keep | |
115 end select; -- looping. | |
116 end loop; | |
117 -- Value of Index | |
118 -- at loop exit | |
119 -- identifies the | |
120 -- avail. printer. | |
121 | |
122 -- Wait for a print request or terminate: | |
123 | |
124 select | |
125 accept Print (File_Name : String) do | |
126 Print_Accepted := True; -- Allow | |
127 -- Verify_Results | |
128 -- to be accepted. | |
129 | |
130 Printer(Index).Start_Printing (File_Name); -- Begin printing on | |
131 -- the available | |
132 -- -- -- printer. | |
133 -- Requeue is tested here -- | |
134 -- -- | |
135 -- Requeue caller so | |
136 requeue Printer(Index).Done_Printing; -- server task free | |
137 -- to accept other | |
138 end Print; -- requests. | |
139 or | |
140 -- Guard ensures that Verify_Results cannot be accepted | |
141 -- until after Print has been accepted. This avoids a | |
142 -- race condition in the main program. | |
143 | |
144 when Print_Accepted => accept Verify_Results; -- Artifice for | |
145 -- testing purposes. | |
146 or | |
147 terminate; | |
148 end select; | |
149 | |
150 -- Allow other tasks to get control | |
151 delay ImpDef.Long_Minimum_Task_Switch; | |
152 | |
153 end loop; | |
154 | |
155 exception | |
156 when others => | |
157 Report.Failed ("Exception raised in Printer_Server task"); | |
158 end Printer_Server; | |
159 | |
160 | |
161 end C954A01_0; | |
162 | |
163 | |
164 --==================================================================-- | |
165 | |
166 | |
167 with Report; | |
168 with ImpDef; | |
169 | |
170 with F954A00; -- Printer device abstraction. | |
171 with C954A01_0; -- Printer server abstraction. | |
172 | |
173 use C954A01_0; | |
174 use F954A00; | |
175 | |
176 procedure C954A01 is | |
177 | |
178 Long_Enough : constant Duration := ImpDef.Long_Switch_To_New_Task; | |
179 | |
180 --==============================================-- | |
181 | |
182 task Print_Request; -- Send a print request. | |
183 | |
184 task body Print_Request is | |
185 My_File : constant String := "MYFILE.DAT"; | |
186 begin | |
187 Printer_Server.Print (My_File); -- Invoke requeue statement. | |
188 Report.Failed ("Task continued execution following entry call"); | |
189 exception | |
190 when others => | |
191 Report.Failed ("Exception raised in Print_Request task"); | |
192 end Print_Request; | |
193 | |
194 --==============================================-- | |
195 | |
196 begin -- Main program. | |
197 | |
198 Report.Test ("C954A01", "Requeue without abort - check that the abort " & | |
199 "is deferred until after the rendezvous completes. (Task to PO)"); | |
200 | |
201 -- To pass this test, the following must be true: | |
202 -- | |
203 -- (A) The abort of Print_Request is deferred until after the | |
204 -- Done_Printing entry body completes. | |
205 -- (B) Print_Request aborts after the Done_Printing entry call | |
206 -- completes. | |
207 -- | |
208 -- Call the entry Verify_Results. The entry call will not be accepted | |
209 -- until after Print_Request has been requeued to Done_Printing. | |
210 | |
211 Printer_Server.Verify_Results; -- Accepted after Print_Request is | |
212 -- requeued to Done_Printing. | |
213 | |
214 -- Simulate an application which needs access to the printer within | |
215 -- a specified time, and which aborts the current printer job if time | |
216 -- runs out. | |
217 | |
218 select | |
219 Printer(1).Done_Printing; -- Wait for printer to come free. | |
220 or | |
221 delay Long_Enough; -- Print job took too long. | |
222 abort Print_Request; -- Abort print job. | |
223 end select; | |
224 | |
225 Printer_Server.Verify_Results; -- Abortion completion point: force | |
226 -- abort to complete (if it's going | |
227 -- to). | |
228 | |
229 -- Verify that the Done_Printing entry body has not yet completed, | |
230 -- and thus that Print_Request has not been aborted. | |
231 | |
232 if Printer(1).Is_Done then | |
233 Report.Failed ("Target entry of requeue executed prematurely"); | |
234 elsif Print_Request'Terminated then | |
235 Report.Failed ("Caller was aborted before entry was complete"); | |
236 else | |
237 | |
238 Printer(1).Handle_Interrupt; -- Simulate a printer interrupt, | |
239 -- signaling that printing is | |
240 -- done. | |
241 | |
242 -- The Done_Printing entry body will complete before the next protected | |
243 -- action is called (Printer(1).Is_Done). Verify (A) and (B): that the | |
244 -- Print_Request is aborted. | |
245 | |
246 Printer_Server.Verify_Results; -- Abortion completion point: force | |
247 -- Print_Request abort to complete. | |
248 | |
249 if not Printer(1).Is_Done then | |
250 Report.Failed ("Target entry of requeue did not complete"); | |
251 end if; | |
252 | |
253 if not Print_Request'Terminated then | |
254 Report.Failed ("Task not aborted following completion of entry call"); | |
255 abort Print_Request; -- Try to kill hung task. | |
256 end if; | |
257 | |
258 end if; | |
259 | |
260 Report.Result; | |
261 | |
262 end C954A01; |