【PTHREAD】linux 多线程编程---Mutex实现Service线程和work线程

最新推荐文章于 2022-10-17 11:57:06 发布

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#pthread #Linux #C++

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本文介绍了一个使用C++实现的多线程程序案例，其中包含一个主线程负责向链表添加数据，两个子线程从链表中取出并删除数据。程序展示了线程同步机制，包括互斥锁的使用。

程序功能：

主线程向list<int>添加数据，两个子线程冲list<int>中取数据并删除该数据。主线程类似于Service线程，子线程类是于work线程。

Code

#include<iostream>
#include<pthread.h>
#include<list>
#include<unistd.h>
#include<stdlib.h>
#include<time.h>
using namespace std;

pthread_mutex_t vc_mutex;

list<int>* pgusts = NULL;
int gust_max_indx = 0;

int get_rand_num()
{
#define MAX_SLEEP_TIME 30
	time_t tsr;
	srand(time(&tsr));
	int rnum = rand()%MAX_SLEEP_TIME;
	return rnum;
}

void * handle_hair(void *arg)
{

	pthread_t pth_id = pthread_self();

   cout<<"child pid<handle_hair>:\t"<<(unsigned int)pth_id<<endl;
	while(1)
	{
		pthread_mutex_lock(&vc_mutex);
		if(NULL != pgusts && !pgusts->empty())
		{
			int igust = pgusts->front();
			pgusts->pop_front();
			cout<<"pthread "<<(unsigned int)pth_id<<" handle"<<igust<<endl;
		}
		pthread_mutex_unlock(&vc_mutex);
		sleep(get_rand_num());
	}
}
void * add_gust(void *arg)
{
  pthread_t pth_id = pthread_self();
  while(1)
  {
	  sleep(get_rand_num()+10);
	  int gust_num = get_rand_num()+1;

	  int i = 0;
	  while(i<gust_num)
	  {
		  pgusts->push_back(i+gust_max_indx+1);
		  ++i;
	  }
	  gust_max_indx+=gust_num;
  }
}

int main(void)
{
	int err;
	if(0 != pthread_mutex_init(&vc_mutex,NULL))
	{
		cerr<<"[error]initialize mutex fail"<<endl;
		return 1;
	}
	pgusts = new list<int>;

	if ( NULL == pgusts )
	{
		cerr<<"[error]malloc list<int> fail"<<endl;
		return 1;
	}
	pthread_t pth_id = pthread_self();

   cout<<"main pid:\t"<<(unsigned int)pth_id<<endl;

	err = pthread_create(&pth_id,NULL,handle_hair,NULL);
	if(0 != err )
	{
		cerr<<"[error]pthread_create fail"<<endl;
		return 1;
	}
   cout<<"child pid:\t"<<(unsigned int)pth_id<<endl;

	err = pthread_create(&pth_id,NULL,handle_hair,NULL);
	if(0 != err )
	{
		cerr<<"[error]pthread_create fail"<<endl;
		return 1;
	}
    cout<<"child pid:\t"<<(unsigned int)pth_id<<endl;

    add_gust(NULL);
	return 0;
}

编译Code:

g++ -g -Wall -o barber_out  barber.c  -lpthread

注意这里必须要添加-lpthread选项，因为pthread不是linux活在标准的c/c++库

运行结果：

main pid:	267999040
child pid:	251287296
child pid:	242894592
child pid<handle_hair>:	251287296
child pid<handle_hair>:	242894592
pthread 251287296 handle1
pthread 242894592 handle2
pthread 251287296 handle3
pthread 242894592 handle4
pthread 251287296 handle5
pthread 242894592 handle6
pthread 251287296 handle7
pthread 242894592 handle8
pthread 251287296 handle9
pthread 242894592 handle10
pthread 251287296 handle11
pthread 242894592 handle12
pthread 251287296 handle13
pthread 242894592 handle14
pthread 242894592 handle15
pthread 251287296 handle16
pthread 251287296 handle17
pthread 251287296 handle18
pthread 242894592 handle19
pthread 242894592 handle20
pthread 242894592 handle21
pthread 242894592 handle22
pthread 242894592 handle23
pthread 242894592 handle24
pthread 242894592 handle25
pthread 242894592 handle26
pthread 242894592 handle27
pthread 242894592 handle28
pthread 242894592 handle29
pthread 242894592 handle30
pthread 242894592 handle31
pthread 242894592 handle32
pthread 242894592 handle33
pthread 242894592 handle34
pthread 242894592 handle35
pthread 242894592 handle36
pthread 242894592 handle37
pthread 242894592 handle38
pthread 242894592 handle39
pthread 242894592 handle40
pthread 242894592 handle41
pthread 242894592 handle42
pthread 242894592 handle43
pthread 242894592 handle44
pthread 242894592 handle45
pthread 242894592 handle46
pthread 242894592 handle47
pthread 242894592 handle48
pthread 242894592 handle49
pthread 242894592 handle50
pthread 242894592 handle51
pthread 242894592 handle52
pthread 242894592 handle53
pthread 242894592 handle54
pthread 242894592 handle55
pthread 242894592 handle56
pthread 242894592 handle57
pthread 242894592 handle58
pthread 242894592 handle59
pthread 242894592 handle60
pthread 242894592 handle61
pthread 242894592 handle62
pthread 242894592 handle63
pthread 242894592 handle64
pthread 242894592 handle65
pthread 242894592 handle66
pthread 242894592 handle67
pthread 242894592 handle68
pthread 242894592 handle69
pthread 242894592 handle70
pthread 251287296 handle71
pthread 242894592 handle72
pthread 251287296 handle73
pthread 242894592 handle74
pthread 251287296 handle75
pthread 242894592 handle76
pthread 251287296 handle77
pthread 242894592 handle78
pthread 251287296 handle79
pthread 251287296 handle80
pthread 251287296 handle81
pthread 251287296 handle82
pthread 251287296 handle83
pthread 251287296 handle84
pthread 251287296 handle85
pthread 251287296 handle86
pthread 251287296 handle87
pthread 251287296 handle88
pthread 251287296 handle89
pthread 251287296 handle90
pthread 251287296 handle91
pthread 251287296 handle92
pthread 251287296 handle93
pthread 251287296 handle94
pthread 251287296 handle95
pthread 251287296 handle96
pthread 251287296 handle97
pthread 251287296 handle98
pthread 251287296 handle99
pthread 251287296 handle100
pthread 251287296 handle101
pthread 251287296 handle102
pthread 251287296 handle103
pthread 251287296 handle104
pthread 251287296 handle105
pthread 251287296 handle106
pthread 251287296 handle107
pthread 251287296 handle108
pthread 251287296 handle109
pthread 251287296 handle110
pthread 251287296 handle111
pthread 251287296 handle112
pthread 251287296 handle113
pthread 251287296 handle114
pthread 251287296 handle115
pthread 251287296 handle116
pthread 251287296 handle117
pthread 251287296 handle118
pthread 251287296 handle119
pthread 251287296 handle120
pthread 251287296 handle121
pthread 251287296 handle122
pthread 251287296 handle123
pthread 242894592 handle124
pthread 251287296 handle125
pthread 242894592 handle126
pthread 251287296 handle127

查看线程运行情况：

ialan@Apprentice>thread$ top -c -H -p 3901

top - 18:01:02 up  2:06,  3 users,  load average: 0.74, 0.68, 0.73
top - 18:01:15 up  2:06,  3 users,  load average: 0.86, 0.72, 0.74
Tasks:   3 total,   0 running,   3 sleeping,   0 stopped,   0 zombie
Cpu(s): 22.0%us,  4.3%sy,  0.0%ni, 72.1%id,  0.8%wa,  0.0%hi,  0.7%si,  0.0%st
Mem:   3903276k total,  2261200k used,  1642076k free,    64988k buffers
Swap:  7999484k total,        0k used,  7999484k free,   878068k cached


  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND                                                        
 3901 ialan     20   0 31124 1104  928 S    0  0.0   0:00.00 ./barber_out                                                   
 3902 ialan     20   0 31124 1104  928 S    0  0.0   0:00.00 ./barber_out                                                   
 3903 ialan     20   0 31124 1104  928 S    0  0.0   0:00.00 ./barber_out