Cleanup

native_client_sdk/src/libraries/nacl_mounts/inode_pool.h

+/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef LIBRARIES_NACL_MOUNTS_INODE_POOL_H_
+#define LIBRARIES_NACL_MOUNTS_INODE_POOL_H_
+
+#include <stdlib.h>
+#include <vector>
+
+#include "nacl_mounts/osstat.h"
+#include "pthread.h"
+#include "utils/auto_lock.h"
+
+
+class INodePool {
+ public:
+  INodePool()
+    : max_nodes_(0),
+      num_nodes_(0) {
+    pthread_mutex_init(&lock_, NULL);
+  }
+  ~INodePool() {
+    pthread_mutex_destroy(&lock_);
+  }
+
+  ino_t Acquire() {
+    AutoLock lock(&lock_);
+    const int INO_CNT = 8;
+
+    // If we run out of INO numbers, then allocate 8 more
+    if (inos_.size() == 0) {
+      max_nodes_ += INO_CNT;
+      // Add eight more to the stack in reverse order, offset by 1
+      // since '0' refers to no INO.
+      for (int a = 0; a < INO_CNT; a++) {
+        inos_.push_back(max_nodes_ - a);
+      }
+    }
+
+    // Return the INO at the top of the stack.
+    int val = inos_.back();
+    inos_.pop_back();
+    num_nodes_++;
+    return val;
+  }
+
+  void Release(ino_t ino) {
+    AutoLock lock(&lock_);
+    inos_.push_back(ino);
+    num_nodes_--;
+  }
+
+  size_t size() const { return num_nodes_; }
+  size_t capacity() const { return max_nodes_; }
+
+ private:
+  size_t num_nodes_;
+  size_t max_nodes_;
+  std::vector<ino_t> inos_;
+  pthread_mutex_t lock_;
+};
+
+#endif  // LIBRARIES_NACL_MOUNTS_INODE_POOL_H_