1// SPDX-License-Identifier: GPL-2.0
 2#include "tests.h"
 3#include "machine.h"
 4#include "thread.h"
 5#include "debug.h"
 6
 7int test__thread_mg_share(struct test *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 map_groups *mg;
16
17	/* other process */
18	struct thread *other, *other_leader;
19	struct map_groups *other_mg;
20
21	/*
22	 * This test create 2 processes abstractions (struct thread)
23	 * with several threads and checks they properly share and
24	 * maintain map groups info (struct map_groups).
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	mg = leader->mg;
46	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 4);
47
48	/* test the map groups pointer is shared */
49	TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
50	TEST_ASSERT_VAL("map groups don't match", mg == t2->mg);
51	TEST_ASSERT_VAL("map groups don't match", mg == t3->mg);
52
53	/*
54	 * Verify the other leader was created by previous call.
55	 * It should have shared map groups 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_mg = other->mg;
74	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 2);
75
76	TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
77
78	/* release thread group */
79	thread__put(leader);
80	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 3);
81
82	thread__put(t1);
83	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 2);
84
85	thread__put(t2);
86	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&mg->refcnt), 1);
87
88	thread__put(t3);
89
90	/* release other group  */
91	thread__put(other_leader);
92	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_mg->refcnt), 1);
93
94	thread__put(other);
95
96	machines__exit(&machines);
97	return 0;
98}