Revert "Revert "More pthreads cleanup.""
This reverts commit 6f94de3ca49e4ea147b1c59e5818fa175846518f
(Doesn't try to increase the number of TLS slots; that leads to
an inability to boot. Adds more tests.)
Change-Id: Ia7d25ba3995219ed6e686463dbba80c95cc831ca
diff --git a/libc/private/ErrnoRestorer.h b/libc/private/ErrnoRestorer.h
new file mode 100644
index 0000000..ed6ab62
--- /dev/null
+++ b/libc/private/ErrnoRestorer.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ERRNO_RESTORER_H
+#define ERRNO_RESTORER_H
+
+#include <errno.h>
+
+class ErrnoRestorer {
+ public:
+ explicit ErrnoRestorer() : saved_errno_(errno) {
+ }
+
+ ~ErrnoRestorer() {
+ errno = saved_errno_;
+ }
+
+ void override(int new_errno) {
+ saved_errno_ = new_errno;
+ }
+
+ private:
+ int saved_errno_;
+
+ // Disallow copy and assignment.
+ ErrnoRestorer(const ErrnoRestorer&);
+ void operator=(const ErrnoRestorer&);
+};
+
+#endif // ERRNO_RESTORER_H