Linux C++备忘录

一、单例模式、多线程之间的资源锁用法

test.h

#include <string>#include <pthread.h>using namespace std;class Test{protected:    pthread_rwlockattr_t _rwaddr;    pthread_rwlock_t _rwlock;protected:    void rlock(){ pthread_rwlock_rdlock(&_rwlock); }    //多线程里互斥量读的时候要加该锁    void wlock(){ pthread_rwlock_wrlock(&_rwlock); }    //多线程里互斥量写的时候要加该锁    void unlock(){ pthread_rwlock_unlock(&_rwlock); }   //解锁private:    Test(void);    ~Test(void);    static Test * _cm;public:    static Test* getInstance();};#endif

test.cpp

#include "test.h"Test *Test::_cm = NULL;Test *Test::getInstance(){    if(NULL == _cm){        _cm = new Test();    }    return _cm;}Test::Test(){    pthread_rwlockattr_init(&_rwaddr);    pthread_rwlock_init(&_rwlock, &_rwaddr);}Test::~Test(){    pthread_rwlock_destroy(&_rwlock);    pthread_rwlockattr_destroy(&_rwaddr);}

二、程序运行参数

#include <getopt.h>void GetOpt(int argc, char** argv, string& setupFilePath){    if(argc<2)    {        cout<<"usage:-v for modul version!\n      -s for confPath!"<<endl;        exit(-1);    }    const char * const short_options = "vs:";    const struct option long_options[] = {{ "version", 0, NULL, 'v' },{ "setup", 1, NULL, 's' },{ NULL, 0, NULL, 0 }};    int next_option;    do{        next_option = getopt_long (argc, argv, short_options, long_options, NULL);        switch( next_option )        {            case 'v': /* -h or --help */                cout<<_VERSION_<<endl;                exit(0);                break;            case 's': /* -s or --setup */                setupFilePath = optarg;                break;            case -1: /* Done with options. */                break;            default: /* Something else: unexpected. */                exit(1);                break;        }    }while( next_option != -1 );}

如：

>test -v   可以查看程序版本号

>test -s test.conf   利用配置文件test.conf来运行程序等

三、捕捉kill消息

#include <getopt.h>void sigRoutine(int sig){    switch(sig)    {        case SIGUSR2:   //-12            {dosomething();                break;            }        case SIGUSR1:   //-10            {                cout<<"safe exit.";                exit(0);                break;            }        default:            break;    }}int main(int argc, char **argv) {    ...    signal(SIGUSR1,sigRoutine);    signal(SIGUSR2,sigRoutine);    signal(SIGPIPE,SIG_IGN);    //捕捉PIPE信号，防止向已关闭的连接中写数据时导致直接退出程序的情况。    ...    return 0;}

如：

>kill -10 ID  程序安全退出