git.maquefel.me Git - linux.git/blob

1 // SPDX-License-Identifier: GPL-2.0

2 #include "tests.h"

3 #include "machine.h"

4 #include "thread.h"

5 #include "debug.h"

7 int test__thread_maps_share(struct test *test __maybe_unused, int subtest __maybe_unused)

8 {

9 struct machines machines;

10 struct machine *machine;

12 /* thread group */

13 struct thread *leader;

14 struct thread *t1, *t2, *t3;

15 struct maps *maps;

17 /* other process */

18 struct thread *other, *other_leader;

19 struct maps *other_maps;

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 */

30 machines__init(&machines);

31 machine = &machines.host;

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);

39 /* and create 1 separated process, without thread leader */

40 other = machine__findnew_thread(machine, 4, 5);

42 TEST_ASSERT_VAL("failed to create threads",

43 leader && t1 && t2 && t3 && other);

45 maps = leader->maps;

46 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 4);

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);

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);

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);

73 other_maps = other->maps;

74 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 2);

76 TEST_ASSERT_VAL("maps don't match", other_maps == other_leader->maps);

78 /* release thread group */

79 thread__put(leader);

80 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 3);

82 thread__put(t1);

83 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 2);

85 thread__put(t2);

86 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 1);

88 thread__put(t3);

90 /* release other group */

91 thread__put(other_leader);

92 TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 1);

94 thread__put(other);

96 machines__exit(&machines);

97 return 0;

98 }