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