1 files changed, 59 insertions, 0 deletions
diff --git a/test/tsan/bench.h b/test/tsan/bench.h
new file mode 100644
index 0000000000000..5ae0dd813db9f
--- /dev/null
+++ b/test/tsan/bench.h
@@ -0,0 +1,59 @@
+#include <pthread.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <time.h>
+
+int bench_nthread;
+int bench_niter;
+int grow_clock_var;
+pthread_barrier_t glow_clock_barrier;
+
+void bench();  // defined by user
+void start_thread_group(int nth, void(*f)(int tid));
+void grow_clock_worker(int tid);
+
+int main(int argc, char **argv) {
+  bench_nthread = 2;
+  if (argc > 1)
+    bench_nthread = atoi(argv[1]);
+  bench_niter = 100;
+  if (argc > 2)
+    bench_niter = atoi(argv[2]);
+
+  // Grow thread's clock.
+  int clock_size = 10;
+  if (argc > 1)
+    clock_size = 1000;
+  pthread_barrier_init(&glow_clock_barrier, 0, clock_size);
+  start_thread_group(clock_size, grow_clock_worker);
+  pthread_barrier_destroy(&glow_clock_barrier);
+  __atomic_load_n(&grow_clock_var, __ATOMIC_ACQUIRE);
+
+  timespec tp0;
+  clock_gettime(CLOCK_MONOTONIC, &tp0);
+  bench();
+  timespec tp1;
+  clock_gettime(CLOCK_MONOTONIC, &tp1);
+  unsigned long long t =
+      (tp1.tv_sec * 1000000000ULL + tp1.tv_nsec) -
+      (tp0.tv_sec * 1000000000ULL + tp0.tv_nsec);
+  fprintf(stderr, "%llu ns/iter\n", t / bench_niter);
+  fprintf(stderr, "DONE\n");
+}
+
+void start_thread_group(int nth, void(*f)(int tid)) {
+  pthread_t *th = (pthread_t*)malloc(nth * sizeof(pthread_t));
+  for (int i = 0; i < nth; i++)
+    pthread_create(&th[i], 0, (void*(*)(void*))f, (void*)(long)i);
+  for (int i = 0; i < nth; i++)
+    pthread_join(th[i], 0);
+}
+
+void grow_clock_worker(int tid) {
+  int res = pthread_barrier_wait(&glow_clock_barrier);
+  if (res == PTHREAD_BARRIER_SERIAL_THREAD)
+    __atomic_store_n(&grow_clock_var, 0, __ATOMIC_RELEASE);
+}
+