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实现boost::thread中RAII风格的共享锁

Thu, 22 Jan 2009 02:22:00 GMT

实现代码�Q?br>

    typedef enum { UNIQUE_LOCK, SHARED_LOCK } LockType;

template<LockType lt>
class shared_lock;

template <>
class shared_lock<UNIQUE_LOCK>: private boost::noncopyable {
public:
    shared_lock(boost::shared_mutex& sm): sm_(sm) { sm_.lock(); }
    ~shared_lock() { sm_.unlock(); }
private:
    boost::shared_mutex& sm_;
};

template <>
class shared_lock<SHARED_LOCK>: private boost::noncopyable {
public:
    shared_lock(boost::shared_mutex& sm): sm_(sm) { sm_.lock_shared(); }
    ~shared_lock() { sm_.unlock_shared(); }
private:
    boost::shared_mutex& sm_;
};

调用方式�Q?br>

boost::shared_mutex session_mutex_;

//独占锁定
shared_lock<UNIQUE_LOCK> lock(session_mutex_);

//�׃�n锁定
shared_lock<SHARED_LOCK> lock(session_mutex_);

http://www.shnenglu.com/thisisbin/archive/2009/01/21/72417.html 一�?single-write/multi-read ��可以应用这�U�RAII风格的共享锁�?/p>

许�v�?/a> 2009-01-22 10:22 发表评论

Wed, 21 Jan 2009 05:58:00 GMT

�E�序中几个线�E�一起往控制台写入log_info�Q�但是可以很清楚的看到begin or write_process不会(x��)同时�q�箋的出玎ͼ�而且在begin of write_process和end of write_process之间肯定不会(x��)出现begin of read_process或者end of read_process。但是begin of read_process却会(x��)在控制台上连�l�出玎ͼ��q�说明在同一时刻只有一个write_prcess在运行，但是wrte_process没有�q�行的时候，�?x��)有多个read_process�q�发�q�行�?br>

1 #include <iostream>
2
3 #include <boost/thread/thread.hpp>
4 #include <boost/thread/shared_mutex.hpp>
5
6 using namespace std;
7 using namespace boost;
8
9 boost::shared_mutex shr_mutex;
10
11 /// �q�个是辅助类�Q�能够保证log_info被完整的输出
12 class safe_log {
13 public:
14     static void log(const std::string& log_info) {
15         boost::mutex::scoped_lock lock(log_mutex);
16         cout << log_info << endl;
17     }
18
19 private:
20     static boost::mutex log_mutex;
21 };
22
23 boost::mutex safe_log::log_mutex;
24
25 void write_process() {
26     shr_mutex.lock();
27     safe_log::log("begin of write_process");
28     safe_log::log("end of write_process");
29     shr_mutex.unlock();
30 }
31
32 void read_process() {
33     shr_mutex.lock_shared();
34     safe_log::log("begin of read_process");
35     safe_log::log("end of read_process");
36     shr_mutex.unlock_shared();
37 }
38
39 int main() {
40
41     thread_group threads;
42     for (int i = 0; i < 10; ++ i) {
43         threads.create_thread(&write_process);
44         threads.create_thread(&read_process);
45     }
46
47     threads.join_all();
48
49     ::system("PAUSE");
50
51     return 0;
52 }

许�v�?/a> 2009-01-21 13:58 发表评论

vs2005下编译基于stlport的boost

Tue, 09 Dec 2008 05:22:00 GMT

1、安装stlport�Q�参考文章：(x��)http://www.cnblogs.com/DonLiang/archive/2007/10/13/923143.html
如果是DEBUG模式请在��目的属�?>配置属�?>c/c++=>命��o(h��)行的附加选项增加/D_STLP_DEBUG

2、boost_1_37_0\tools\jam\stage下运行build.bat�~�译生成bjam.exe�q�拷贝到boost根目�?br>
3、修攚w��|�文件boost_1_37_0\tools\build\v2\user-config.jam�Q�将两个stlport选项打开

4、vs2005命��o(h��)提示下编译命令：(x��)bjam stdlib=stlport --build-type=complete install�Q�接下来是�O长的�{�待�Q�大概两个小时以上吧

许�v�?/a> 2008-12-09 13:22 发表评论