--- /dev/null
+/*
+ * Copyright (c) 2013 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ * Authors:
+ * Daniel Vetter <daniel.vetter@ffwll.ch>
+ */
+
+#include <sys/ioctl.h>
+#include <stdlib.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <pthread.h>
+
+#include "drmtest.h"
+#include "i915_drm.h"
+#include "intel_bufmgr.h"
+
+/* Testcase: check for flink/open vs. gem close races
+ *
+ * The gem flink open ioctl had a little race with gem close which could result
+ * in the flink name and corresponding reference getting leaked.
+ */
+
+/* We want lockless and I'm to lazy to dig out an atomic libarary. On x86 this
+ * works, too. */
+volatile int pls_die = 0;
+int fd;
+
+static void *thread_fn(void *p)
+{
+ struct drm_gem_open open_struct;
+ int ret;
+
+ while (!pls_die) {
+ memset(&open_struct, 0, sizeof(open_struct));
+
+ open_struct.name = 1;
+ ret = ioctl(fd, DRM_IOCTL_GEM_OPEN, &open_struct);
+ if (ret == 0)
+ gem_close(fd, open_struct.handle);
+ }
+
+ printf("meh\n");
+
+ return (void *)0;
+}
+
+int main(int argc, char **argv)
+{
+ int num_threads;
+ pthread_t *threads;
+ int r, i;
+ void *status;
+
+ drmtest_skip_on_simulation();
+
+ num_threads = sysconf(_SC_NPROCESSORS_ONLN) - 1;
+ if (!num_threads)
+ num_threads = 1;
+
+ threads = calloc(num_threads, sizeof(pthread_t));
+
+ fd = drm_open_any();
+ assert(fd >= 0);
+
+ for (i = 0; i < num_threads; i++) {
+ r = pthread_create(&threads[i], NULL, thread_fn, NULL);
+ assert(r == 0);
+ }
+
+ for (i = 0; i < 1000000; i++) {
+ uint32_t handle;
+
+ handle = gem_create(fd, 4096);
+
+ gem_flink(fd, handle);
+
+ gem_close(fd, handle);
+ }
+
+ pls_die = 1;
+
+ for (i = 0; i < num_threads; i++) {
+ pthread_join(threads[i], &status);
+ assert(status == 0);
+ }
+
+ fd = drm_open_any();
+ assert(fd >= 0);
+
+ close(fd);
+
+ return 0;
+}