From f67e15e50f392625b4097caf22e8be1b0fe96013 Mon Sep 17 00:00:00 2001
From: "jorlow@chromium.org"
 <jorlow@chromium.org@62dab493-f737-651d-591e-8d6aee1b9529>
Date: Fri, 18 Mar 2011 22:37:00 +0000
Subject: Initial checkin.

git-svn-id: https://leveldb.googlecode.com/svn/trunk@2 62dab493-f737-651d-591e-8d6aee1b9529
---
 port/port_posix.h | 108 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 port/port_posix.h

(limited to 'port/port_posix.h')

diff --git a/port/port_posix.h b/port/port_posix.h
new file mode 100644
index 0000000..e7bc5b8
--- /dev/null
+++ b/port/port_posix.h
@@ -0,0 +1,108 @@
+// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file. See the AUTHORS file for names of contributors.
+//
+// See port_example.h for documentation for the following types/functions.
+
+#ifndef STORAGE_LEVELDB_PORT_PORT_POSIX_H_
+#define STORAGE_LEVELDB_PORT_PORT_POSIX_H_
+
+#include <endian.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <string>
+#include <cstdatomic>
+#include <cstring>
+#include "port/sha1_portable.h"
+
+namespace leveldb {
+namespace port {
+
+static const bool kLittleEndian = (__BYTE_ORDER == __LITTLE_ENDIAN);
+
+class CondVar;
+
+class Mutex {
+ public:
+  Mutex();
+  ~Mutex();
+
+  void Lock();
+  void Unlock();
+  void AssertHeld() { }
+
+ private:
+  friend class CondVar;
+  pthread_mutex_t mu_;
+
+  // No copying
+  Mutex(const Mutex&);
+  void operator=(const Mutex&);
+};
+
+class CondVar {
+ public:
+  explicit CondVar(Mutex* mu);
+  ~CondVar();
+  void Wait();
+  void Signal();
+  void SignalAll();
+ private:
+  pthread_cond_t cv_;
+  Mutex* mu_;
+};
+
+// Storage for a lock-free pointer
+class AtomicPointer {
+ private:
+  std::atomic<void*> rep_;
+ public:
+  AtomicPointer() { }
+  explicit AtomicPointer(void* v) : rep_(v) { }
+  inline void* Acquire_Load() const {
+    return rep_.load(std::memory_order_acquire);
+  }
+  inline void Release_Store(void* v) {
+    rep_.store(v, std::memory_order_release);
+  }
+  inline void* NoBarrier_Load() const {
+    return rep_.load(std::memory_order_relaxed);
+  }
+  inline void NoBarrier_Store(void* v) {
+    rep_.store(v, std::memory_order_relaxed);
+  }
+};
+
+inline void SHA1_Hash(const char* data, size_t len, char* hash_array) {
+  SHA1_Hash_Portable(data, len, hash_array);
+}
+
+/**
+ * TODO(gabor): Implement actual compress
+ *     This is a hack - it just copies input to output.
+ *     No actual compression occurs.
+ */
+inline void Lightweight_Compress(const char* input, size_t input_length,
+                           std::string* output) {
+  output->assign(input, input_length);
+}
+
+/**
+ * TODO(gabor): Implement actual uncompress
+ *     This is a hack - it just copies input to output.
+ *     No actual uncompression occurs.
+ */
+inline bool Lightweight_Uncompress(const char* input_data, size_t input_length,
+                             std::string* output) {
+  output->assign(input_data, input_length);
+  return true;
+}
+
+inline bool GetHeapProfile(void (*func)(void*, const char*, int), void* arg) {
+  return false;
+}
+
+}
+}
+
+#endif  // STORAGE_LEVELDB_PORT_PORT_POSIX_H_
-- 
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