From 45d36f36ad0aa45040e997f53c465b034d49d1d9 Mon Sep 17 00:00:00 2001
From: Rajith Muditha Attapattu <rajith@apache.org>
Date: Fri, 16 Nov 2007 17:33:34 +0000
Subject: Creating a new tag for M2 final release

git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/tags/M2@595753 13f79535-47bb-0310-9956-ffa450edef68
---
 Final/cpp/lib/common/sys/Mutex.h | 158 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 Final/cpp/lib/common/sys/Mutex.h

(limited to 'Final/cpp/lib/common/sys/Mutex.h')

diff --git a/Final/cpp/lib/common/sys/Mutex.h b/Final/cpp/lib/common/sys/Mutex.h
new file mode 100644
index 0000000000..ae1d6369af
--- /dev/null
+++ b/Final/cpp/lib/common/sys/Mutex.h
@@ -0,0 +1,158 @@
+#ifndef _sys_Mutex_h
+#define _sys_Mutex_h
+
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.
+ *
+ */
+
+#ifdef USE_APR
+#  include <apr_thread_mutex.h>
+#  include <apr_pools.h>
+#  include "apr/APRBase.h"
+#  include "apr/APRPool.h"
+#else
+#  include <pthread.h>
+#  include <posix/check.h>
+#endif
+#include <boost/noncopyable.hpp>
+
+namespace qpid {
+namespace sys {
+
+/**
+ * Scoped lock template: calls lock() in ctor, unlock() in dtor.
+ * L can be any class with lock() and unlock() functions.
+ */
+template <class L>
+class ScopedLock
+{
+  public:
+    ScopedLock(L& l) : mutex(l) { l.lock(); }
+    ~ScopedLock() { mutex.unlock(); }
+  private:
+    L& mutex;
+};
+
+/**
+ * Mutex lock.
+ */
+class Mutex : private boost::noncopyable {
+  public:
+    typedef ScopedLock<Mutex> ScopedLock;
+    
+    inline Mutex();
+    inline ~Mutex();
+    inline void lock();
+    inline void unlock();
+    inline void trylock();
+
+  protected:
+#ifdef USE_APR
+    apr_thread_mutex_t* mutex;
+    apr_pool_t* pool;
+#else
+    pthread_mutex_t mutex;
+#endif
+};
+
+#ifdef USE_APR
+// APR ================================================================
+
+Mutex::Mutex() {
+    pool = APRPool::get();
+    CHECK_APR_SUCCESS(apr_thread_mutex_create(&mutex, APR_THREAD_MUTEX_NESTED, pool));
+}
+
+Mutex::~Mutex(){
+    CHECK_APR_SUCCESS(apr_thread_mutex_destroy(mutex));
+    APRPool::free(pool);    
+}
+
+void Mutex::lock() {
+    CHECK_APR_SUCCESS(apr_thread_mutex_lock(mutex));
+}
+void Mutex::unlock() {
+    CHECK_APR_SUCCESS(apr_thread_mutex_unlock(mutex));
+}
+
+void Mutex::trylock() {
+    CHECK_APR_SUCCESS(apr_thread_mutex_trylock(mutex));
+}
+
+#else
+// POSIX ================================================================
+
+/**
+ * PODMutex is a POD, can be static-initialized with
+ * PODMutex m = QPID_PODMUTEX_INITIALIZER
+ */
+struct PODMutex 
+{
+    typedef ScopedLock<PODMutex> ScopedLock;
+
+    inline void lock();
+    inline void unlock();
+    inline void trylock();
+
+    // Must be public to be a POD:
+    pthread_mutex_t mutex;
+};
+
+#define QPID_MUTEX_INITIALIZER { PTHREAD_MUTEX_INITIALIZER }
+
+
+void PODMutex::lock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_lock(&mutex));
+}
+void PODMutex::unlock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_unlock(&mutex));
+}
+
+void PODMutex::trylock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_trylock(&mutex));
+}
+
+
+Mutex::Mutex() {
+    QPID_POSIX_THROW_IF(pthread_mutex_init(&mutex, 0));
+}
+
+Mutex::~Mutex(){
+    QPID_POSIX_THROW_IF(pthread_mutex_destroy(&mutex));
+}
+
+void Mutex::lock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_lock(&mutex));
+}
+void Mutex::unlock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_unlock(&mutex));
+}
+
+void Mutex::trylock() {
+    QPID_POSIX_THROW_IF(pthread_mutex_trylock(&mutex));
+}
+
+#endif // USE_APR
+
+}}
+
+
+
+#endif  /*!_sys_Mutex_h*/
-- 
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