mutex.cpp

来自「功能强大的开源加密软件。使用最新ieee-p1619标准」· C++ 代码 · 共 57 行

/*
 Copyright (c) 2008 TrueCrypt Foundation. All rights reserved.

 Governed by the TrueCrypt License 2.4 the full text of which is contained
 in the file License.txt included in TrueCrypt binary and source code
 distribution packages.
*/

#include <pthread.h>
#include "Platform/Mutex.h"
#include "Platform/SystemException.h"

namespace TrueCrypt
{
	Mutex::Mutex ()
	{
		pthread_mutexattr_t attributes;

		int status = pthread_mutexattr_init (&attributes);
		if (status != 0)
			throw SystemException (SRC_POS, status);

		status = pthread_mutexattr_settype (&attributes, PTHREAD_MUTEX_RECURSIVE);
		if (status != 0)
			throw SystemException (SRC_POS, status);

		status = pthread_mutex_init (&SystemMutex, &attributes);
		if (status != 0)
			throw SystemException (SRC_POS, status);

		Initialized = true;
	}

	Mutex::~Mutex ()
	{
		Initialized = false;
		int status = pthread_mutex_destroy (&SystemMutex);
		if (status != 0)
			throw SystemException (SRC_POS, status);
	}

	void Mutex::Lock ()
	{
		assert (Initialized);
		int status = pthread_mutex_lock (&SystemMutex);
		if (status != 0)
			throw SystemException (SRC_POS, status);
	}

	void Mutex::Unlock ()
	{
		int status = pthread_mutex_unlock (&SystemMutex);
		if (status != 0)
			throw SystemException (SRC_POS, status);
	}
}