1 // SPDX-License-Identifier: GPL-2.0
2 #include "tests.h"
3 #include "machine.h"
4 #include "thread.h"
5 #include "debug.h"
6
test__thread_maps_share(struct test_suite * test __maybe_unused,int subtest __maybe_unused)7 static int test__thread_maps_share(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
8 {
9 struct machines machines;
10 struct machine *machine;
11
12 /* thread group */
13 struct thread *leader;
14 struct thread *t1, *t2, *t3;
15 struct maps *maps;
16
17 /* other process */
18 struct thread *other, *other_leader;
19 struct maps *other_maps;
20
21 /*
22 * This test create 2 processes abstractions (struct thread)
23 * with several threads and checks they properly share and
24 * maintain maps info (struct maps).
25 *
26 * thread group (pid: 0, tids: 0, 1, 2, 3)
27 * other group (pid: 4, tids: 4, 5)
28 */
29
30 machines__init(&machines);
31 machine = &machines.host;
32
33 /* create process with 4 threads */
34 leader = machine__findnew_thread(machine, 0, 0);
35 t1 = machine__findnew_thread(machine, 0, 1);
36 t2 = machine__findnew_thread(machine, 0, 2);
37 t3 = machine__findnew_thread(machine, 0, 3);
38
39 /* and create 1 separated process, without thread leader */
40 other = machine__findnew_thread(machine, 4, 5);
41
42 TEST_ASSERT_VAL("failed to create threads",
43 leader && t1 && t2 && t3 && other);
44
45 maps = thread__maps(leader);
46 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 4);
47
48 /* test the maps pointer is shared */
49 TEST_ASSERT_VAL("maps don't match", RC_CHK_ACCESS(maps) == RC_CHK_ACCESS(thread__maps(t1)));
50 TEST_ASSERT_VAL("maps don't match", RC_CHK_ACCESS(maps) == RC_CHK_ACCESS(thread__maps(t2)));
51 TEST_ASSERT_VAL("maps don't match", RC_CHK_ACCESS(maps) == RC_CHK_ACCESS(thread__maps(t3)));
52
53 /*
54 * Verify the other leader was created by previous call.
55 * It should have shared maps with no change in
56 * refcnt.
57 */
58 other_leader = machine__find_thread(machine, 4, 4);
59 TEST_ASSERT_VAL("failed to find other leader", other_leader);
60
61 /*
62 * Ok, now that all the rbtree related operations were done,
63 * lets remove all of them from there so that we can do the
64 * refcounting tests.
65 */
66 machine__remove_thread(machine, leader);
67 machine__remove_thread(machine, t1);
68 machine__remove_thread(machine, t2);
69 machine__remove_thread(machine, t3);
70 machine__remove_thread(machine, other);
71 machine__remove_thread(machine, other_leader);
72
73 other_maps = thread__maps(other);
74 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(other_maps)), 2);
75
76 TEST_ASSERT_VAL("maps don't match", RC_CHK_ACCESS(other_maps) ==
77 RC_CHK_ACCESS(thread__maps(other_leader)));
78
79 /* release thread group */
80 thread__put(t3);
81 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 3);
82
83 thread__put(t2);
84 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 2);
85
86 thread__put(t1);
87 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 1);
88
89 thread__put(leader);
90
91 /* release other group */
92 thread__put(other_leader);
93 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(other_maps)), 1);
94
95 thread__put(other);
96
97 machines__exit(&machines);
98 return 0;
99 }
100
101 DEFINE_SUITE("Share thread maps", thread_maps_share);
102