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- // SPDX-License-Identifier: GPL-2.0
- #include "tests.h"
- #include "machine.h"
- #include "thread.h"
- #include "debug.h"
- int test__thread_maps_share(struct test *test __maybe_unused, int subtest __maybe_unused)
- {
- struct machines machines;
- struct machine *machine;
- /* thread group */
- struct thread *leader;
- struct thread *t1, *t2, *t3;
- struct maps *maps;
- /* other process */
- struct thread *other, *other_leader;
- struct maps *other_maps;
- /*
- * This test create 2 processes abstractions (struct thread)
- * with several threads and checks they properly share and
- * maintain maps info (struct maps).
- *
- * thread group (pid: 0, tids: 0, 1, 2, 3)
- * other group (pid: 4, tids: 4, 5)
- */
- machines__init(&machines);
- machine = &machines.host;
- /* create process with 4 threads */
- leader = machine__findnew_thread(machine, 0, 0);
- t1 = machine__findnew_thread(machine, 0, 1);
- t2 = machine__findnew_thread(machine, 0, 2);
- t3 = machine__findnew_thread(machine, 0, 3);
- /* and create 1 separated process, without thread leader */
- other = machine__findnew_thread(machine, 4, 5);
- TEST_ASSERT_VAL("failed to create threads",
- leader && t1 && t2 && t3 && other);
- maps = leader->maps;
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 4);
- /* test the maps pointer is shared */
- TEST_ASSERT_VAL("maps don't match", maps == t1->maps);
- TEST_ASSERT_VAL("maps don't match", maps == t2->maps);
- TEST_ASSERT_VAL("maps don't match", maps == t3->maps);
- /*
- * Verify the other leader was created by previous call.
- * It should have shared maps with no change in
- * refcnt.
- */
- other_leader = machine__find_thread(machine, 4, 4);
- TEST_ASSERT_VAL("failed to find other leader", other_leader);
- /*
- * Ok, now that all the rbtree related operations were done,
- * lets remove all of them from there so that we can do the
- * refcounting tests.
- */
- machine__remove_thread(machine, leader);
- machine__remove_thread(machine, t1);
- machine__remove_thread(machine, t2);
- machine__remove_thread(machine, t3);
- machine__remove_thread(machine, other);
- machine__remove_thread(machine, other_leader);
- other_maps = other->maps;
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 2);
- TEST_ASSERT_VAL("maps don't match", other_maps == other_leader->maps);
- /* release thread group */
- thread__put(leader);
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 3);
- thread__put(t1);
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 2);
- thread__put(t2);
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&maps->refcnt), 1);
- thread__put(t3);
- /* release other group */
- thread__put(other_leader);
- TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(&other_maps->refcnt), 1);
- thread__put(other);
- machines__exit(&machines);
- return 0;
- }
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