Fix #1728: racing test (#1764)

tests/gdb-tests/tests/binaries/multiple_threads.c

@@ -6,14 +6,6 @@
 
 sem_t sem;
 
-void *thread_function(void *arg)
-{
-    sem_post(&sem);
-    usleep(4000);
-    exit(1);
-    return NULL;
-}
-
 void *useless_thread(void *arg)
 {
     // signal the semaphore to indicate that the thread has started
@@ -37,7 +29,7 @@ int main()
     sem_init(&sem, 0, 0);
 
     pthread_t thread1, thread2;
-    int res1 = pthread_create(&thread1, NULL, thread_function, NULL);
+    int res1 = pthread_create(&thread1, NULL, useless_thread, NULL);
     if (res1 != 0) {
         perror("Thread creation failed");
         exit(EXIT_FAILURE);

tests/gdb-tests/tests/test_command_killthreads.py

@@ -33,10 +33,6 @@ def test_command_killthreads_kills_all_threads_except_current(start_binary):
     # check if only one thread is left
     wait_until(lambda: len(gdb.selected_inferior().threads()) == 1)
 
-    gdb.execute("continue")
-    exit_code = gdb.execute("print $_exitcode", to_string=True)
-    assert exit_code == "$1 = 0\n"  # if the second thread was killed, the exit code should be 0
-
 
 def test_command_killthreads_kills_specific_thread(start_binary):
     start_binary(REFERENCE_BINARY_THREADS)