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 int test__thread_maps_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 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