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TOMOYO Linux Cross Reference
Linux/tools/perf/tests/thread-mg-share.c

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  1 #include "tests.h"
  2 #include "machine.h"
  3 #include "thread.h"
  4 #include "map.h"
  5 #include "debug.h"
  6 
  7 int test__thread_mg_share(void)
  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 map_groups *mg;
 16 
 17         /* other process */
 18         struct thread *other, *other_leader;
 19         struct map_groups *other_mg;
 20 
 21         /*
 22          * This test create 2 processes abstractions (struct thread)
 23          * with several threads and checks they properly share and
 24          * maintain map groups info (struct map_groups).
 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         mg = leader->mg;
 46         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 4);
 47 
 48         /* test the map groups pointer is shared */
 49         TEST_ASSERT_VAL("map groups don't match", mg == t1->mg);
 50         TEST_ASSERT_VAL("map groups don't match", mg == t2->mg);
 51         TEST_ASSERT_VAL("map groups don't match", mg == t3->mg);
 52 
 53         /*
 54          * Verify the other leader was created by previous call.
 55          * It should have shared map groups 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_mg = other->mg;
 74         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 2);
 75 
 76         TEST_ASSERT_VAL("map groups don't match", other_mg == other_leader->mg);
 77 
 78         /* release thread group */
 79         thread__put(leader);
 80         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 3);
 81 
 82         thread__put(t1);
 83         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 2);
 84 
 85         thread__put(t2);
 86         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&mg->refcnt), 1);
 87 
 88         thread__put(t3);
 89 
 90         /* release other group  */
 91         thread__put(other_leader);
 92         TEST_ASSERT_EQUAL("wrong refcnt", atomic_read(&other_mg->refcnt), 1);
 93 
 94         thread__put(other);
 95 
 96         machines__exit(&machines);
 97         return 0;
 98 }
 99 

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