1 files changed, 76 insertions, 0 deletions

diff --git a/mtp/ffs/PosixAsyncIO.cpp b/mtp/ffs/PosixAsyncIO.cpp
new file mode 100644
index 000000000..435000afc
--- /dev/null
+++ b/mtp/ffs/PosixAsyncIO.cpp
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+
+#include <android-base/logging.h>
+#include <condition_variable>
+#include <memory>
+#include <mutex>
+#include <queue>
+#include <unistd.h>
+
+#include "PosixAsyncIO.h"
+
+namespace {
+
+void read_func(struct aiocb *aiocbp) {
+	aiocbp->ret = TEMP_FAILURE_RETRY(pread(aiocbp->aio_fildes,
+				aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
+	if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+void write_func(struct aiocb *aiocbp) {
+	aiocbp->ret = TEMP_FAILURE_RETRY(pwrite(aiocbp->aio_fildes,
+				aiocbp->aio_buf, aiocbp->aio_nbytes, aiocbp->aio_offset));
+	if (aiocbp->ret == -1) aiocbp->error = errno;
+}
+
+} // end anonymous namespace
+
+aiocb::~aiocb() {
+	CHECK(!thread.joinable());
+}
+
+int aio_read(struct aiocb *aiocbp) {
+	aiocbp->thread = std::thread(read_func, aiocbp);
+	return 0;
+}
+
+int aio_write(struct aiocb *aiocbp) {
+	aiocbp->thread = std::thread(write_func, aiocbp);
+	return 0;
+}
+
+int aio_error(const struct aiocb *aiocbp) {
+	return aiocbp->error;
+}
+
+ssize_t aio_return(struct aiocb *aiocbp) {
+	return aiocbp->ret;
+}
+
+int aio_suspend(struct aiocb *aiocbp[], int n,
+		const struct timespec *) {
+	for (int i = 0; i < n; i++) {
+		aiocbp[i]->thread.join();
+	}
+	return 0;
+}
+
+void aio_prepare(struct aiocb *aiocbp, void* buf, size_t count, off_t offset) {
+	aiocbp->aio_buf = buf;
+	aiocbp->aio_offset = offset;
+	aiocbp->aio_nbytes = count;
+}