Add flock(2)ing on dex-cache files to prevent races

Bug: 9071417
Change-Id: I1ee9ff281867f90fba7a8ed8bbf06b33ac29d511

1 files changed, 2 insertions, 2 deletions

diff --git a/compiler/llvm/llvm_compilation_unit.cc b/compiler/llvm/llvm_compilation_unit.cc
index 7542b841a1..139100bee9 100644
--- a/compiler/llvm/llvm_compilation_unit.cc
+++ b/compiler/llvm/llvm_compilation_unit.cc
@@ -155,7 +155,7 @@ void LlvmCompilationUnit::DumpBitcodeToFile() {
   std::string bitcode;
   DumpBitcodeToString(bitcode);
   std::string filename(StringPrintf("%s/Art%u.bc", DumpDirectory().c_str(), cunit_id_));
-  UniquePtr<File> output(OS::OpenFile(filename.c_str(), true));
+  UniquePtr<File> output(OS::CreateEmptyFile(filename.c_str()));
   output->WriteFully(bitcode.data(), bitcode.size());
   LOG(INFO) << ".bc file written successfully: " << filename;
 }
@@ -182,7 +182,7 @@ bool LlvmCompilationUnit::Materialize() {
   if (kDumpELF) {
     // Dump the ELF image for debugging
     std::string filename(StringPrintf("%s/Art%u.o", DumpDirectory().c_str(), cunit_id_));
-    UniquePtr<File> output(OS::OpenFile(filename.c_str(), true));
+    UniquePtr<File> output(OS::CreateEmptyFile(filename.c_str()));
     output->WriteFully(elf_object_.data(), elf_object_.size());
     LOG(INFO) << ".o file written successfully: " << filename;
   }