[fuzzer] Fix threaded stack printing
Reviewers: kcc
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D39397
llvm-svn: 317071
diff --git a/compiler-rt/test/fuzzer/TraceMallocThreadedTest.cpp b/compiler-rt/test/fuzzer/TraceMallocThreadedTest.cpp
new file mode 100644
index 0000000..5603af3
--- /dev/null
+++ b/compiler-rt/test/fuzzer/TraceMallocThreadedTest.cpp
@@ -0,0 +1,22 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Check that allocation tracing from different threads does not cause
+// interleaving of stack traces.
+#include <assert.h>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+#include <thread>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+ auto C = [&] {
+ volatile void *a = malloc(5639);
+ free((void *)a);
+ };
+ std::thread T[] = {std::thread(C), std::thread(C), std::thread(C),
+ std::thread(C), std::thread(C), std::thread(C)};
+ for (auto &X : T)
+ X.join();
+ return 0;
+}