[PATCH v5 bpf-next 5/6] selftests: xsk: make sure single threaded test terminates

[Maciej Fijalkowski <maciej.fijalkowski@intel.com>]

For single threaded poll tests call pthread_kill() from main thread so
that we are sure worker thread has finished its job and it is possible
to proceed with next test types from test suite. It was observed that on
some platforms it takes a bit longer for worker thread to exit and next
test case sees device as busy in this case.

Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
---
 tools/testing/selftests/bpf/xskxceiver.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tools/testing/selftests/bpf/xskxceiver.c b/tools/testing/selftests/bpf/xskxceiver.c
index 4f8a028f5433..8e157c462cd0 100644
--- a/tools/testing/selftests/bpf/xskxceiver.c
+++ b/tools/testing/selftests/bpf/xskxceiver.c
@@ -1345,6 +1345,11 @@ static void testapp_clean_xsk_umem(struct ifobject *ifobj)
 	munmap(ifobj->umem->buffer, umem_sz);
 }
 
+static void handler(int signum)
+{
+	pthread_exit(NULL);
+}
+
 static int testapp_validate_traffic_single_thread(struct test_spec *test, struct ifobject *ifobj,
 						  enum test_type type)
 {
@@ -1362,6 +1367,7 @@ static int testapp_validate_traffic_single_thread(struct test_spec *test, struct
 	test->ifobj_rx->shared_umem = false;
 	test->ifobj_tx->shared_umem = false;
 
+	signal(SIGUSR1, handler);
 	/* Spawn thread */
 	pthread_create(&t0, NULL, ifobj->func_ptr, test);
 
@@ -1371,6 +1377,7 @@ static int testapp_validate_traffic_single_thread(struct test_spec *test, struct
 	if (pthread_barrier_destroy(&barr))
 		exit_with_error(errno);
 
+	pthread_kill(t0, SIGUSR1);
 	pthread_join(t0, NULL);
 
 	if (test->total_steps == test->current_step || test->fail) {
-- 
2.34.1