// SPDX-License-Identifier: GPL-2.0
#include "tests.h"
#include "machine.h"
#include "thread.h"
#include "debug.h"

static int test__thread_maps_share(struct test_suite *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 = thread__maps(leader);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 4);

        /* test the maps pointer is shared */
        TEST_ASSERT_VAL("maps don't match", maps__equal(maps, thread__maps(t1)));
        TEST_ASSERT_VAL("maps don't match", maps__equal(maps, thread__maps(t2)));
        TEST_ASSERT_VAL("maps don't match", maps__equal(maps, thread__maps(t3)));

        /*
         * 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 = thread__maps(other);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(other_maps)), 2);

        TEST_ASSERT_VAL("maps don't match", maps__equal(other_maps, thread__maps(other_leader)));

        /* release thread group */
        thread__put(t3);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 3);

        thread__put(t2);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 2);

        thread__put(t1);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(maps)), 1);

        thread__put(leader);

        /* release other group  */
        thread__put(other_leader);
        TEST_ASSERT_EQUAL("wrong refcnt", refcount_read(maps__refcnt(other_maps)), 1);

        thread__put(other);

        machines__exit(&machines);
        return 0;
}

DEFINE_SUITE("Share thread maps", thread_maps_share);