1 // SPDX-License-Identifier: GPL-2.0
2 #include "tests.h"
3 #include "machine.h"
4 #include "thread.h"
5 #include "debug.h"
6 
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 = leader->maps;
46 	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 4);
47 
48 	/* test the maps pointer is shared */
49 	TEST_ASSERT_VAL("maps don't match", maps == t1->maps);
50 	TEST_ASSERT_VAL("maps don't match", maps == t2->maps);
51 	TEST_ASSERT_VAL("maps don't match", maps == t3->maps);
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 = other->maps;
74 	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 2);
75 
76 	TEST_ASSERT_VAL("maps don't match", other_maps == other_leader->maps);
77 
78 	/* release thread group */
79 	thread__put(leader);
80 	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 3);
81 
82 	thread__put(t1);
83 	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 2);
84 
85 	thread__put(t2);
86 	TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->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_maps->refcnt), 1);
93 
94 	thread__put(other);
95 
96 	machines__exit(&machines);
97 	return 0;
98 }
99 
100 DEFINE_SUITE("Share thread maps", thread_maps_share);
101