tsan: add a stress test

The stress test does various assorted things
(memory accesses, function calls, atomic operations,
thread creation/join, intercepted libc calls)
in multiple threads just to stress various parts
of the runtime.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D110416

compiler-rt/test/tsan/stress.cpp

@@ -0,0 +1,74 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %env_tsan_opts="flush_memory_ms=1 flush_symbolizer_ms=1 memory_limit_mb=1" %run %t 2>&1 | FileCheck %s
+#include "test.h"
+#include <fcntl.h>
+#include <string.h>
+
+volatile long stop;
+long atomic, read_only;
+int fds[2];
+
+__attribute__((noinline)) void *SecondaryThread(void *x) {
+  __atomic_fetch_add(&atomic, 1, __ATOMIC_ACQ_REL);
+  return NULL;
+}
+
+void *Thread(void *x) {
+  const int me = (long)x;
+  volatile long sink = 0;
+  while (!stop) {
+    // If me == 0, we do all of the following,
+    // otherwise only 1 type of action.
+    if (me == 0 || me == 1) {
+      // just read the stop variable
+    }
+    if (me == 0 || me == 2) {
+      __atomic_store_n(&atomic, 1, __ATOMIC_RELEASE);
+    }
+    if (me == 0 || me == 3) {
+      sink += __atomic_fetch_add(&atomic, 1, __ATOMIC_ACQ_REL);
+    }
+    if (me == 0 || me == 4) {
+      SecondaryThread(NULL);
+    }
+    if (me == 0 || me == 5) {
+      write(fds[1], fds, 1);
+    }
+    if (me == 0 || me == 6) {
+      char buf[2];
+      read(fds[0], &buf, sizeof(buf));
+    }
+    if (me == 0 || me == 7) {
+      pthread_t th;
+      pthread_create(&th, NULL, SecondaryThread, NULL);
+      pthread_join(th, NULL);
+    }
+    if (me == 0 || me == 8) {
+      long buf;
+      memcpy(&buf, &read_only, sizeof(buf));
+      sink += buf;
+    }
+    // If you add more actions, update kActions in main.
+  }
+  return NULL;
+}
+
+int main() {
+  ANNOTATE_BENIGN_RACE(stop);
+  if (pipe2(fds, O_NONBLOCK))
+    exit((perror("pipe2"), 1));
+  const int kActions = 9;
+  const int kMultiplier = 4;
+  pthread_t t[kActions * kMultiplier];
+  for (int i = 0; i < kActions * kMultiplier; i++)
+    pthread_create(&t[i], NULL, Thread, (void *)(long)(i % kActions));
+  sleep(5);
+  stop = 1;
+  for (int i = 0; i < kActions * kMultiplier; i++)
+    pthread_join(t[i], NULL);
+  fprintf(stderr, "DONE\n");
+  return 0;
+}
+
+// CHECK-NOT: ThreadSanitizer:
+// CHECK: DONE
+// CHECK-NOT: ThreadSanitizer:

compiler-rt/test/tsan/test.h

@@ -88,8 +88,10 @@ void AnnotateIgnoreSyncEnd(const char *f, int l);
 void AnnotateHappensBefore(const char *f, int l, void *addr);
 void AnnotateHappensAfter(const char *f, int l, void *addr);
 
-void AnnotateBenignRaceSized(const char *f, int l, void *mem, unsigned int size, const char *desc);
-void WTFAnnotateBenignRaceSized(const char *f, int l, void *mem, unsigned int size, const char *desc);
+void AnnotateBenignRaceSized(const char *f, int l, const volatile void *mem,
+                             unsigned int size, const char *desc);
+void WTFAnnotateBenignRaceSized(const char *f, int l, const volatile void *mem,
+                                unsigned int size, const char *desc);
 
 #ifdef __cplusplus
 }