pthread_mutex_lock线程互斥锁示例

#include<pthread.h>

#include<iostream>

#include<stdint.h>

using namespace std;



int32_t var;

pthread_mutex_t locker=PTHREAD_MUTEX_INITIALIZER;



void* thread_fun(void*)

{

for(int32_t i=0;i<4;i++)

{

pthread_mutex_lock(&locker);

cout<<"in thread......"<<i<<endl;

var++;

cout<<"var:"<<var<<endl;

pthread_mutex_unlock(&locker);

sleep(1);



}

return NULL;

}



int32_t main()

{

pthread_t thread_id;

if(pthread_create(&thread_id,NULL,thread_fun,NULL)!=0)

{

cout<<"cannot creat new thread"<<endl;

return 1;

}

for(int32_t i=0;i<4;i++)

{

pthread_mutex_lock(&locker);

cout<<"in main thread......"<<i<<endl;

var++;

cout<<"var:"<<var<<endl;

pthread_mutex_unlock(&locker);

sleep(1);

}

if(pthread_join(thread_id,NULL))

{

cout<<"cannot joint thread"<<endl;

return 1;

}

//将主线程加锁，用户输入“123”方能解锁、然后主线程关闭。

pthread_mutex_lock(&locker);

while(true)

{

int a;

cout<<"input the number:"<<endl;

cin>>a;

if(a==123)

{

pthread_mutex_unlock(&locker);

break;

}



}

cout<<"\t\tvar:"<<var<<endl;

return 0;

}

输出：

in main thread......0

var:1

in thread......0

var:2

in main thread......1

var:3

in thread......1

var:4

in main thread......2

var:5

in thread......2

var:6

in main thread......3

var:7

in thread......3

var:8

input the number:

124

input the number:

26

input the number:

123

var:8