1// SPDX-License-Identifier: GPL-2.0
2#include "tests.h"
3#include "machine.h"
4#include "thread.h"
5#include "debug.h"
6
7static 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", maps__equal(maps, thread__maps(t1)));
50	TEST_ASSERT_VAL("maps don't match", maps__equal(maps, thread__maps(t2)));
51	TEST_ASSERT_VAL("maps don't match", maps__equal(maps, 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", maps__equal(other_maps, thread__maps(other_leader)));
77
78	/* release thread group */
79	thread__put(t3);
80	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 3);
81
82	thread__put(t2);
83	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 2);
84
85	thread__put(t1);
86	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 1);
87
88	thread__put(leader);
89
90	/* release other group  */
91	thread__put(other_leader);
92	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(other_maps)), 1);
93
94	thread__put(other);
95
96	machines__exit(&machines);
97	return 0;
98}
99
100DEFINE_SUITE("Share thread maps", thread_maps_share);
101