13.1 多线程操作共享内存、生产者消费者模型、多线程服务器框架

　　生产者消费者模型如下：

程序如下：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 
  4 #include <stdlib.h>
  5 #include <stdio.h>
  6 #include <errno.h>
  7 #include <string.h>
  8 
  9 #include <pthread.h>
 10 
 11 int g_Count = 0;
 12 
 13 int     nNum, nLoop;
 14 
 15 //定义锁
 16 pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 17 
 18 //定义条件并初始化
 19 pthread_cond_t my_condition=PTHREAD_COND_INITIALIZER;
 20 
 21 #define CUSTOM_COUNT 2
 22 #define PRODUCT_COUNT 4
 23 
 24 
 25   // int pthread_mutex_lock(pthread_mutex_t *mutex);
 26   //     int pthread_mutex_trylock(pthread_mutex_t *mutex);
 27    //    int pthread_mutex_unlock(pthread_mutex_t *mutex);
 28 
 29 /*
 30        int pthread_cond_timedwait(pthread_cond_t *restrict cond,
 31               pthread_mutex_t *restrict mutex,
 32               const struct timespec *restrict abstime);
 33        int pthread_cond_wait(pthread_cond_t *restrict cond,
 34               pthread_mutex_t *restrict mutex);
 35               */
 36 
 37 //posix 线程库的函数 线程库
 38 void *consume(void* arg)
 39 {
 40     
 41     int inum = 0;
 42     inum = (int)arg;
 43     while(1)
 44     {
 45         pthread_mutex_lock(&mutex);
 46         printf("consum:%d
", inum);
 47         while (g_Count == 0)  //while 醒来以后需要重新判断 条件g_Count是否满足，如果不满足，再次wait
 48         {
 49             printf("consum:%d 开始等待
", inum);
 50             pthread_cond_wait(&my_condition, &mutex); //api做了三件事情 //pthread_cond_wait假醒
 51             printf("consum:%d 醒来
", inum);
 52         }
 53     
 54         printf("consum:%d 消费产品begin
", inum);
 55         g_Count--; //消费产品
 56         printf("consum:%d 消费产品end
", inum);
 57         
 58         pthread_mutex_unlock(&mutex);
 59     
 60         sleep(1);
 61     }
 62 
 63     pthread_exit(0);
 64 
 65 } 
 66 
 67 //生产者线程
 68 //
 69 void *produce(void* arg)
 70 {
 71     int inum = 0;
 72     inum = (int)arg;
 73     
 74     while(1)
 75     {
 76     
 77     /*
 78         //因为是很多生产者调用produce，要保护全局变量g_Count，所以加锁 
 79         pthread_mutex_lock(&mutex);
 80         if (g_Count > 20)
 81         {
 82             printf("produce:%d 产品太多，需要控制，休眠
", inum);
 83             pthread_mutex_unlock(&mutex);
 84             sleep(1);
 85             continue;
 86         }
 87         else
 88         {
 89             pthread_mutex_unlock(&mutex);
 90         }
 91         */
 92     
 93         pthread_mutex_lock(&mutex);
 94         printf("产品数量:%d
", g_Count);
 95         printf("produce:%d 生产产品begin
", inum);
 96         g_Count++;
 97         //只要我生产出一个产品，就告诉消费者去消费
 98         printf("produce:%d 生产产品end
", inum);
 99         
100         printf("produce:%d 发条件signal begin
", inum);
101         pthread_cond_signal(&my_condition); //通知，在条件上等待的线程 
102         printf("produce:%d 发条件signal end
", inum);
103         
104         pthread_mutex_unlock(&mutex);
105         sleep(1);
106     }
107     
108     pthread_exit(0);
109 
110 } 
111 
112 //结论：return arg 和 pthread_exit（）的结果都可以让pthread_join 接过来
113 int main()
114 {
115     int        i =0;
116     pthread_t    tidArray[CUSTOM_COUNT+PRODUCT_COUNT+10];
117     
118     //创建消费者线程
119     for (i=0; i<CUSTOM_COUNT; i++)
120     {
121         pthread_create(&tidArray[i], NULL, consume, (void *)i);
122     }
123     
124     sleep(1);
125     //创建生产线程
126     for (i=0; i<PRODUCT_COUNT; i++)
127     {
128         pthread_create(&tidArray[i+CUSTOM_COUNT], NULL, produce, (void*)i);
129     }
130     
131     
132     
133     for (i=0; i<CUSTOM_COUNT+PRODUCT_COUNT; i++)
134     {
135         pthread_join(tidArray[i], NULL); //等待线程结束。。。
136     }
137     
138     
139     printf("进程也要结束1233
");
140     
141     return 0;
142 }

执行结果如下：

条件等待模型如下：

多线程访问共享内存，通过信号量同步：不同进程中的线程无法进行同步与互斥

  1 #include <sys/types.h>
  2 #include <unistd.h>
  3 
  4 #include <stdlib.h>
  5 #include <stdio.h>
  6 #include <string.h>
  7 
  8 #include <signal.h>
  9 #include <errno.h>
 10 #include <signal.h>
 11 #include <sys/wait.h>
 12 
 13 #include "myipc_sem.h"
 14 #include "myipc_shm.h"
 15 
 16 #include <pthread.h>
 17 
 18 int g_key = 0x3333;
 19 
 20 void TestFunc(int loopnum)
 21 {
 22     printf("loopnum:%d
", loopnum);
 23     
 24     int ncount = 0;
 25     int ret = 0;
 26     int shmhdl = 0;
 27     int *addr = NULL;
 28     
 29     int semid = 0;
 30     sem_open(g_key, &semid);
 31 
 32 
 33      sem_p(semid); //临界区开始
 34     //
 35         ret = IPC_CreatShm(".", 0, &shmhdl);
 36         
 37         ret =IPC_MapShm(shmhdl, (void **)&addr);
 38         *((int *)addr) =  *((int *)addr)  + 1;
 39         ncount = *((int *)addr);
 40         printf("ncount:%d
", ncount);
 41         //addr[0] = addr[0] +1;
 42         ret =IPC_UnMapShm(addr);
 43         //sleep(2);
 44         
 45     sem_v(semid);  //临界区开始
 46     //
 47     printf("进程正常退出:%d
", getpid());
 48 }    
 49 
 50 
 51 
 52 //posix 线程库的函数 线程库
 53 void *thread_routine(void* arg)
 54 {
 55     printf("thread_routine start
");
 56     TestFunc(1);
 57     pthread_exit(0);
 58 
 59 } 
 60 
 61 int main(void )
 62 {
 63     int res;
 64     int procnum=10;
 65     int loopnum = 100;
 66     
 67     pthread_t tidArray[200];
 68 
 69 
 70     int  i=0,j = 0;
 71 
 72     printf("请输入要创建子进程的个数 : 
");
 73     scanf("%d", &procnum);
 74 
 75     printf("请输入让每个子进程测试多少次 :
");
 76     scanf("%d", &loopnum);
 77     
 78     //共享内存创建
 79     int        ret = 0;
 80     int     shmhdl = 0;
 81     ret = IPC_CreatShm(".", sizeof(int), &shmhdl);
 82     if (ret != 0)
 83     {
 84         printf("func IPC_CreatShm() err:%d 
", ret);
 85         return ret;
 86     }
 87     
 88     
 89     //信号量的创建
 90      int      semid = 0;
 91     ret = sem_creat(g_key, &semid);
 92     if (ret != 0)
 93     {
 94         printf("func sem_creat() err:%d,重新按照open打开信号量 
", ret);
 95         if (ret == SEMERR_EEXIST)
 96         {
 97             ret = sem_open(g_key, &semid);
 98             if (ret != 0)
 99             {
100                 printf("按照打开的方式，重新获取sem失败:%d 
", ret);
101                 return ret;
102             }
103         }
104         else
105         {
106             return ret;
107         }
108         
109     }
110     
111     int  val = 0;
112     ret = sem_getval(semid, &val);
113     if (ret != 0 )
114     {
115         printf("func sem_getval() err:%d 
", ret);
116         return ret;
117     }
118     printf("sem val:%d
", val);
119     getchar();
120     
121     for (i=0; i<procnum; i++)
122     {
123     
124         //tmp.numId = i; //这说明 线程函数在使用了一个不断变化的内存空间。。。。
125         pthread_create(&tidArray[i], NULL, thread_routine, NULL);
126     }
127     
128     for (i=0; i<procnum; i++)
129     {
130         pthread_join(tidArray[i], NULL); //等待线程结束。。。
131     }
132 
133 
134     printf("父进程退出 hello...
");
135     return 0;
136 }

多线程访问共享内存，通过线程锁实现：

  1 #include <sys/types.h>
  2 #include <unistd.h>
  3 
  4 #include <stdlib.h>
  5 #include <stdio.h>
  6 #include <string.h>
  7 
  8 #include <signal.h>
  9 #include <errno.h>
 10 #include <signal.h>
 11 #include <sys/wait.h>
 12 
 13 #include "myipc_sem.h"
 14 #include "myipc_shm.h"
 15 
 16 #include <pthread.h>
 17 
 18 pthread_mutex_t mymutex = PTHREAD_MUTEX_INITIALIZER;
 19 
 20 int g_key = 0x3333;
 21 
 22 void TestFunc(int loopnum)
 23 {
 24     printf("loopnum:%d
", loopnum);
 25     
 26     int ncount = 0;
 27     int ret = 0;
 28     int shmhdl = 0;
 29     int *addr = NULL;
 30     
 31     int semid = 0;
 32     sem_open(g_key, &semid);
 33 
 34 
 35      sem_p(semid); //临界区开始
 36     //
 37         ret = IPC_CreatShm(".", 0, &shmhdl);
 38         
 39         ret =IPC_MapShm(shmhdl, (void **)&addr);
 40         *((int *)addr) =  *((int *)addr)  + 1;
 41         ncount = *((int *)addr);
 42         printf("ncount:%d
", ncount);
 43         //addr[0] = addr[0] +1;
 44         ret =IPC_UnMapShm(addr);
 45         //sleep(2);
 46         
 47     sem_v(semid);  //临界区开始
 48     //
 49     printf("进程正常退出:%d
", getpid());
 50 }    
 51 
 52 void TestFunc_threadMutex(int loopnum)
 53 {
 54     printf("loopnum:%d
", loopnum);
 55     
 56     int ncount = 0;
 57     int ret = 0;
 58     int shmhdl = 0;
 59     int *addr = NULL;
 60     
 61     int semid = 0;
 62     sem_open(g_key, &semid);
 63 
 64 
 65      //sem_p(semid); //临界区开始
 66      pthread_mutex_lock(&mymutex);
 67     //
 68         ret = IPC_CreatShm(".", 0, &shmhdl);
 69         
 70         ret =IPC_MapShm(shmhdl, (void **)&addr);
 71         *((int *)addr) =  *((int *)addr)  + 1;
 72         ncount = *((int *)addr);
 73         printf("ncount:%d
", ncount);
 74         //addr[0] = addr[0] +1;
 75         ret =IPC_UnMapShm(addr);
 76         //sleep(2);
 77         
 78     //sem_v(semid);  //临界区开始
 79     pthread_mutex_unlock(&mymutex);
 80     //
 81     printf("进程正常退出:%d
", getpid());
 82 }    
 83 
 84 
 85 
 86 
 87 //posix 线程库的函数 线程库
 88 void *thread_routine(void* arg)
 89 {
 90     printf("thread_routine start
");
 91     //TestFunc(1);
 92     TestFunc_threadMutex(1);
 93     pthread_exit(0);
 94 
 95 } 
 96 
 97 int main(void )
 98 {
 99     int res;
100     int procnum=10;
101     int loopnum = 100;
102     
103     pthread_t tidArray[1024*10];
104 
105 
106     int  i=0,j = 0;
107 
108     printf("请输入要创建子进程的个数 : 
");
109     scanf("%d", &procnum);
110 
111     printf("请输入让每个子进程测试多少次 :
");
112     scanf("%d", &loopnum);
113     
114     //共享内存创建
115     int        ret = 0;
116     int     shmhdl = 0;
117     ret = IPC_CreatShm(".", sizeof(int), &shmhdl);
118     if (ret != 0)
119     {
120         printf("func IPC_CreatShm() err:%d 
", ret);
121         return ret;
122     }
123     
124     
125     //信号量的创建
126      int      semid = 0;
127     ret = sem_creat(g_key, &semid);
128     if (ret != 0)
129     {
130         printf("func sem_creat() err:%d,重新按照open打开信号量 
", ret);
131         if (ret == SEMERR_EEXIST)
132         {
133             ret = sem_open(g_key, &semid);
134             if (ret != 0)
135             {
136                 printf("按照打开的方式，重新获取sem失败:%d 
", ret);
137                 return ret;
138             }
139         }
140         else
141         {
142             return ret;
143         }
144         
145     }
146     
147     int  val = 0;
148     ret = sem_getval(semid, &val);
149     if (ret != 0 )
150     {
151         printf("func sem_getval() err:%d 
", ret);
152         return ret;
153     }
154     printf("sem val:%d
", val);
155     getchar();
156     
157     for (i=0; i<procnum; i++)
158     {
159     
160         //tmp.numId = i; //这说明 线程函数在使用了一个不断变化的内存空间。。。。
161         pthread_create(&tidArray[i], NULL, thread_routine, NULL);
162     }
163     
164     for (i=0; i<procnum; i++)
165     {
166         pthread_join(tidArray[i], NULL); //等待线程结束。。。
167     }
168 
169 
170     printf("父进程退出 hello...
");
171     return 0;
172 }

服务器多进程模型、共享内存、信号量：

信号量封装：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 #include <sys/stat.h>
  4 #include <fcntl.h>
  5 #include <sys/mman.h>
  6 #include <sys/ipc.h>
  7 #include <sys/shm.h>
  8 #include <sys/sem.h>
  9 
 10 #include <stdlib.h>
 11 #include <stdio.h>
 12 #include <errno.h>
 13 #include <string.h>
 14 
 15 #include <sys/ipc.h>
 16 #include <sys/sem.h>
 17 #include "myipc_sem.h"
 18 
 19 
 20 union semun {
 21 int              val;    /* Value for SETVAL */
 22 struct semid_ds *buf;    /* Buffer for IPC_STAT, IPC_SET */
 23 unsigned short  *array;  /* Array for GETALL, SETALL */
 24 struct seminfo  *__buf;  /* Buffer for IPC_INFO
 25                            (Linux specific) */
 26 };
 27 
 28 //@返回值 0 正确 其他错误
 29 int sem_creat(int key, int *semid)
 30 {
 31     int     ret = 0;
 32     //int     tmpsemid = 0;
 33     
 34     if (semid == NULL)
 35     {
 36         ret = SEMERR_PARAM;
 37         printf("func sem_creat() err:%d
", ret);
 38         return ret;
 39     }
 40     ret = semget(key, 1, 0666| IPC_CREAT | IPC_EXCL); 
 41     if (ret == -1)
 42     {
 43             ret = errno;
 44             //perror("semget");
 45             if (errno == EEXIST) 
 46             {
 47                 ret = SEMERR_EEXIST;
 48                 printf("func sem_creat() 检测到信号量集已经存在:%d
", ret);
 49                 return ret;
 50             }
 51     }
 52     *semid = ret;
 53     
 54     ret = sem_setval(*semid, 1);
 55     if (ret != 0)
 56     {
 57         printf("func sem_setval() err:%d
", ret);
 58         return ret;
 59     }
 60     ret = 0;
 61     return ret;
 62 }   
 63 
 64 int sem_open(int key, int *semid)
 65 {
 66     int ret = 0;
 67     
 68     if (semid == NULL)
 69     {
 70         ret = SEMERR_PARAM;
 71         printf("func sem_open() err:%d
", ret);
 72         return ret;
 73     }
 74     
 75     ret = semget(key, 0, 0); 
 76     if (ret == -1)
 77     {
 78             ret = errno;
 79             printf("func sem_open() 失败:%d
", ret);
 80             return ret;    
 81     }
 82     *semid = ret;
 83     ret = 0;
 84     return ret;
 85 }  
 86 
 87 int sem_setval(int semid, int val)
 88 {
 89     int ret = 0;
 90     union semun su;
 91     su.val = val;
 92     ret = semctl(semid, 0,  SETVAL, su);
 93     return ret;
 94 }
 95 
 96 /*
 97 int sem_getval(int semid, int *val)
 98 {
 99     int ret = 0;
100     int tmpval;
101     if (val == NULL)
102     {
103         ret = SEMERR_PARAM;
104         printf("func sem_getval() err:%d
", ret);
105         return ret;
106     }
107     union semun su;
108     tmpval = su.val ;
109     ret = semctl(semid, 0, GETVAL, su);
110     *val = tmpval  ;
111     printf("val:%d
", tmpval);
112     return ret;
113 }
114 */
115 int sem_getval(int semid, int *myval)
116 {
117     int ret = 0;
118     int val;
119     union semun su;
120     val = su.val ;
121     //信号量 计数值
122     ret = semctl(semid, 0, GETVAL, su);
123     //printf("val:%d
", val);
124     
125     *myval = ret;
126     ret = 0;
127     return ret;
128 }
129 
130 //信号量p操作时候，需要传递好几个信息给linux内核
131 //所以linux内核定义了一个结构
132 //我要操作信号量集的下标 0
133 //我要执行什么操作 -1 +1
134 //我按照什么策略执行操作 0  UNDO NOWAITing
135 int sem_p(int semid)
136 {
137     struct sembuf buf = {0, -1, 0};
138     int ret = 0;
139     ret = semop(semid, &buf, 1);
140     return ret;
141 }
142 
143 int sem_v(int semid)
144 {
145     struct sembuf buf = {0, 1, 0};
146     int ret = 0;
147     ret = semop(semid, &buf, 1);
148     return ret;
149 }
150 
151 
152 /*
153 int main()
154 {
155     
156     //IPC_CREAT and IPC_EXCL a
157     int semid;
158     semid  = sem_creat(0x1111);
159     //sem_setval(semid, 1);
160     //sem_getval(semid);
161     
162     
163     int pid = 0;
164     pid = fork();
165     
166 
167     //sem_p(semid);
168         int i=0;
169     //    printf("i:%d pid:%d 
", i++, getpid());
170     //    sleep(3);
171     //    printf("i:%d pid:%d 
", i++, getpid());
172         
173     //sem_v(semid);
174     
175     
176     
177     return 0;
178 }
179 */

共享内存封装：

 1 #define    _OS_LINUX_
 2 
 3 #if defined _OS_LINUX_
 4 #include <stdio.h>
 5 #include <errno.h>
 6 #include <unistd.h>
 7 #include <memory.h>
 8 #include <sys/ipc.h>
 9 #include <sys/shm.h>
10 #include <sys/sem.h>
11 #include <sys/msg.h>
12 #include "myipc_shm.h" 
13 
14 #endif
15 
16 int shmflag = 0;
17 int shmkey;
18 
19 /***********************************************************************
20   功能描述：    创建共享内存
21   参数说明：    shmname  [in]  是共享内存名,系统中唯一标志
22                 shmsize  [in]  是要创建的共享内存的大小；
23                 shmhdl   [out] 共享内存的句柄.
24   返回值：      返回0函数执行成功；非0返回错误码
25 ************************************************************************/
26 int IPC_CreatShm(char *shmseedfile, int shmsize, int *shmhdl)
27 {
28     if(shmflag == 0)            //判断接口中共享内存key是否已经存在
29     {
30         shmkey = ftok(shmseedfile, 'c');
31         if (shmkey == -1)
32         {
33             perror("ftok");
34             return -1;
35         }
36             
37         shmflag = 1;
38     }
39     
40     //创建共享内存
41     *shmhdl = shmget(shmkey,shmsize,IPC_CREAT|0666);
42     if (*shmhdl == -1)            //创建失败
43         return -2;
44     return 0;
45 
46 }
47 /***********************************************************************
48   功能描述：    关联共享内存
49   参数说明：    shmhdl    [in]  共享的句柄
50                 mapaddr [out] 共享内存首地址
51   返回值：      返回0函数执行成功；非0返回错误码
52 ************************************************************************/
53 int
54 IPC_MapShm(int  shmhdl, void  **mapaddr)
55 {
56     void *tempptr = NULL;
57 
58     //连接共享内存
59     tempptr = (void *)shmat(shmhdl,0,SHM_RND);
60     if ((int)tempptr == -1)        //共享内存连接失败
61         return -1;
62     *mapaddr = tempptr;            //导出共享内存首指针
63 
64     return 0;
65 }
66 /***********************************************************************
67   功能描述：    取消共享内存关联
68   参数说明：    unmapaddr   [in] 共享内存首地址
69   返回值：      返回0函数执行成功；非0返回错误码
70 ************************************************************************/
71 int IPC_UnMapShm(void *unmapaddr)
72 {
73     int  rv;
74     //取消连接共享内存 
75     rv = shmdt((char *)unmapaddr);
76     if (rv == -1)            //取消连接失败
77         return -1;
78 
79     return 0;
80 }
81 /***********************************************************************
82   功能描述：    删除共享内存
83   参数说明：    shmhdl    [in]  共享的句柄
84   返回值：      返回0函数执行成功；非0返回错误码
85 ************************************************************************/
86 int IPC_DelShm(int shmhdl)
87 {
88     int  rv;
89     //删除共享内存
90     rv = shmctl(shmhdl,IPC_RMID,NULL);
91     if(rv < 0)                //删除共享内存失败
92         return -1;
93     return 0;
94 }

客户端：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 //#include <sys/socket.h>
  4 //#include <netinet/in.h>
  5 //#include <arpa/inet.h>
  6 #include <signal.h>
  7 #include <sys/wait.h>
  8 //#include "sckutil.h"
  9 
 10 #include <stdlib.h>
 11 #include <stdio.h>
 12 #include <errno.h>
 13 #include <string.h>
 14 
 15 #include "commsocket.h"
 16 
 17 void handle(int signum)
 18 {
 19     int pid = 0;
 20     printf("recv signum:%d 
", signum);
 21     
 22     //避免僵尸进程
 23     while ((pid = waitpid(-1, NULL, WNOHANG) ) > 0)
 24     {
 25         printf("退出子进程pid%d 
", pid);
 26         fflush(stdout);
 27     } 
 28 }
 29 
 30 
 31 
 32 int main()
 33 {    
 34     int         ret = 0;
 35     void         *handle = NULL;
 36     //void         handle = NULL;
 37     int         connfd;
 38     int                 i = 0, j = 0;
 39     
 40     signal(SIGCHLD, handle);
 41     signal(SIGPIPE, SIG_IGN); //防止 sokcet破裂
 42     
 43     int procnum=10;
 44     int loopnum = 100;
 45     
 46     pthread_t tidArray[1024*2];
 47     
 48 
 49 
 50     printf("请输入要创建子进程的个数 : 
");
 51     scanf("%d", &procnum);
 52 
 53     printf("请输入让每个子进程测试多少次 :
");
 54     scanf("%d", &loopnum);
 55     
 56         
 57      unsigned char *data = (unsigned char *)"aaaaaafffffffffffssssss";
 58      int         datalen = 10;
 59      
 60      unsigned char out[1024];
 61      int outlen = 1024;
 62     //客户端环境初始化
 63     
 64     ret = sckCliet_init(&handle, 15, 5, 5, 10);
 65 
 66     for (i=0; i<procnum; i++)
 67     {
 68         int pid = fork();
 69         if (pid == 0)
 70         {
 71             ret = sckCliet_getconn(handle, "127.0.0.1", 8001, &connfd);
 72             for (j=0; j<loopnum; j++)
 73             {
 74                 //客户端发送报文
 75                 ret = sckClient_send(handle,  connfd, data, datalen);
 76                 if (ret != 0)
 77                 {
 78                     if (ret == Sck_ErrTimeOut)
 79                     {
 80                         continue;
 81                     }
 82                     break;
 83                 }
 84                 //printf("ccccccc
");
 85                     //客户端端接受报文
 86                 ret = sckClient_rev(handle, connfd, out, &outlen); //10
 87                 if (ret != 0)
 88                 {
 89                     if (ret == Sck_ErrTimeOut)
 90                     {
 91                         break; 
 92                     }
 93                     break;
 94                 }
 95                 out[outlen] = '';
 96             
 97                 printf("out: %s 
", out);
 98             }
 99             
100             close(connfd);
101             exit(0); //让子进程退出，不参与fork
102         }
103     }
104     
105 
106     // 客户端环境释放 
107     ret = sckClient_destroy(handle);
108     
109     //避免僵尸进程
110     int mypid;
111     while ((mypid = waitpid(-1, NULL, WNOHANG) ) > 0)
112     {
113         printf("退出子进程pid%d 
", mypid);
114         fflush(stdout);
115     } 
116 
117 }

服务器：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 #include <signal.h>
  4 #include <sys/wait.h>
  5 
  6 
  7 #include <stdlib.h>
  8 #include <stdio.h>
  9 #include <errno.h>
 10 #include <string.h>
 11 #include "commsocket.h"
 12 
 13 #include "myipc_sem.h"
 14 #include "myipc_shm.h"
 15 int g_key = 0x3333;
 16 
 17 #define ERR_EXIT(m) 
 18         do 
 19         { 
 20                 perror(m); 
 21                 exit(EXIT_FAILURE); 
 22         } while(0)
 23         
 24         
 25 #include <signal.h>
 26 
 27 void handle(int signum)
 28 {
 29     int pid = 0;
 30     printf("recv signum:%d 
", signum);
 31     
 32     //避免僵尸进程
 33     while ((pid = waitpid(-1, NULL, WNOHANG) ) > 0)
 34     {
 35         printf("退出子进程pid%d 
", pid);
 36         fflush(stdout);
 37     } 
 38 }
 39 
 40 int srvInit()
 41 {
 42     //共享内存创建
 43     int        ret = 0;
 44     int     shmhdl = 0;
 45     ret = IPC_CreatShm(".", sizeof(int), &shmhdl);
 46     if (ret != 0)
 47     {
 48         printf("func IPC_CreatShm() err:%d 
", ret);
 49         return ret;
 50     }
 51     
 52     
 53     //信号量的创建
 54      int      semid = 0;
 55     ret = sem_creat(g_key, &semid);
 56     if (ret != 0)
 57     {
 58         printf("func sem_creat() err:%d,重新按照open打开信号量 
", ret);
 59         if (ret == SEMERR_EEXIST)
 60         {
 61             ret = sem_open(g_key, &semid);
 62             if (ret != 0)
 63             {
 64                 printf("按照打开的方式，重新获取sem失败:%d 
", ret);
 65                 return ret;
 66             }
 67         }
 68         else
 69         {
 70             return ret;
 71         }
 72         
 73     }
 74     
 75     int  val = 0;
 76     ret = sem_getval(semid, &val);
 77     if (ret != 0 )
 78     {
 79         printf("func sem_getval() err:%d 
", ret);
 80         return ret;
 81     }
 82     printf("sem val:%d
", val);
 83     
 84 }
 85 
 86 
 87 void TestFunc()
 88 {
 89     int ncount = 0;
 90     int ret = 0;
 91     int shmhdl = 0;
 92     int *addr = NULL;
 93     
 94     int semid = 0;
 95     sem_open(g_key, &semid);
 96 
 97 
 98      sem_p(semid); //临界区开始
 99     //
100         ret = IPC_CreatShm(".", 0, &shmhdl);
101         
102         ret =IPC_MapShm(shmhdl, (void **)&addr);
103         *((int *)addr) =  *((int *)addr)  + 1;
104         ncount = *((int *)addr);
105         printf("ncount:%d
", ncount);
106         //addr[0] = addr[0] +1;
107         ret =IPC_UnMapShm(addr);
108         //sleep(2);
109         
110     sem_v(semid);  //临界区开始
111     //
112     //printf("进程正常退出:%d
", getpid());
113 }    
114 
115 int main(void)
116 {
117     int        ret = 0;
118     int     listenfd;
119     
120     
121     signal(SIGCHLD, handle);
122     signal(SIGPIPE, SIG_IGN);
123     
124     //完成共享内存和信号量的创建
125     srvInit();
126     //getchar();
127 
128     ret = sckServer_init(8001, &listenfd);
129     if (ret != 0)
130     {
131         printf("sckServer_init() err:%d 
", ret);
132         return ret;
133     }
134     
135     while(1)
136     {
137         int ret = 0;
138         int wait_seconds = 5;
139         int connfd = 0;
140 
141         ret = sckServer_accept(listenfd, &connfd,  wait_seconds);
142         if (ret == Sck_ErrTimeOut)
143         {
144             //printf("timeout....
");
145             continue;
146         }
147     
148         int pid = fork();
149         if (pid == 0)
150         {
151             unsigned char     recvbuf[1024];
152             int     recvbuflen = 1024;
153                 
154             close(listenfd);
155             while(1)
156             {
157                 memset(recvbuf, 0, sizeof(recvbuf));
158                 ret = sckServer_rev(connfd, recvbuf, &recvbuflen,  wait_seconds);
159                 if (ret != 0)
160                 {
161                     printf("func sckServer_rev() err:%d 
", ret);
162                     break;
163                 }
164                 
165                 TestFunc();
166                 printf("recvbuf:%s
", recvbuf);
167                 
168                 //
169                 ret = sckServer_send(connfd,  recvbuf, recvbuflen, wait_seconds);
170                 if (ret != 0)
171                 {
172                     printf("func sckServer_send() err:%d 
", ret);
173                     break;
174                 }
175             }
176             close(connfd);
177             exit(ret);
178         }
179         else if (pid > 0)
180         {
181             close(connfd);
182         }
183     }
184     
185 
186     return 0;
187 }

服务器多线程框架：

客户端连接封装：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 #include <sys/socket.h>
  4 #include <netinet/in.h>
  5 #include <arpa/inet.h>
  6 #include <signal.h>
  7 #include <sys/wait.h>
  8 
  9 #include <fcntl.h>
 10 
 11 
 12 #include <stdlib.h>
 13 #include <stdio.h>
 14 #include <errno.h>
 15 #include <string.h>
 16 
 17 #include "commsocket.h"
 18 
 19 typedef struct _SckHandle
 20 {
 21     int sockArray[100];
 22     int arrayNum;
 23     int sockfd;
 24     int contime;
 25     int sendtime;
 26     int revtime;
 27 
 28 }SckHandle;
 29 
 30 /**
 31  * readn - 读取固定字节数
 32  * @fd: 文件描述符
 33  * @buf: 接收缓冲区
 34  * @count: 要读取的字节数
 35  * 成功返回count，失败返回-1，读到EOF返回<count
 36  */
 37 ssize_t readn(int fd, void *buf, size_t count)
 38 {
 39     size_t nleft = count;
 40     ssize_t nread;
 41     char *bufp = (char*)buf;
 42 
 43     while (nleft > 0)
 44     {
 45         if ((nread = read(fd, bufp, nleft)) < 0)
 46         {
 47             if (errno == EINTR)
 48                 continue;
 49             return -1;
 50         }
 51         else if (nread == 0)
 52             return count - nleft;
 53 
 54         bufp += nread;
 55         nleft -= nread;
 56     }
 57 
 58     return count;
 59 }
 60 
 61 /**
 62  * writen - 发送固定字节数
 63  * @fd: 文件描述符
 64  * @buf: 发送缓冲区
 65  * @count: 要读取的字节数
 66  * 成功返回count，失败返回-1
 67  */
 68 ssize_t writen(int fd, const void *buf, size_t count)
 69 {
 70     size_t nleft = count;
 71     ssize_t nwritten;
 72     char *bufp = (char*)buf;
 73 
 74     while (nleft > 0)
 75     {
 76         if ((nwritten = write(fd, bufp, nleft)) < 0)
 77         {
 78             if (errno == EINTR)
 79                 continue;
 80             return -1;
 81         }
 82         else if (nwritten == 0)
 83             continue;
 84 
 85         bufp += nwritten;
 86         nleft -= nwritten;
 87     }
 88 
 89     return count;
 90 }
 91 
 92 /**
 93  * recv_peek - 仅仅查看套接字缓冲区数据，但不移除数据
 94  * @sockfd: 套接字
 95  * @buf: 接收缓冲区
 96  * @len: 长度
 97  * 成功返回>=0，失败返回-1
 98  */
 99 ssize_t recv_peek(int sockfd, void *buf, size_t len)
100 {
101     while (1)
102     {
103         int ret = recv(sockfd, buf, len, MSG_PEEK);
104         if (ret == -1 && errno == EINTR)
105             continue;
106         return ret;
107     }
108 }
109 
110 
111 //函数声明
112 //客户端环境初始化
113 int sckCliet_init(void **handle, int contime, int sendtime, int revtime, int nConNum)
114 {
115     int     ret = 0;
116     if (handle == NULL ||contime<0 || sendtime<0 || revtime<0)
117     {
118         ret = Sck_ErrParam;
119         printf("func sckCliet_init() err: %d, check  (handle == NULL ||contime<0 || sendtime<0 || revtime<0)
", ret);
120         return ret;
121     }
122     
123     SckHandle *tmp = (SckHandle *)malloc(sizeof(SckHandle));
124     if (tmp == NULL)
125     {
126         ret = Sck_ErrMalloc;
127         printf("func sckCliet_init() err: malloc %d
", ret);
128         return ret;
129     }
130     
131     tmp->contime = contime;
132     tmp->sendtime = sendtime;
133     tmp->revtime = revtime;
134     tmp->arrayNum = nConNum;
135         
136         
137     /*
138     int sockfd;
139     int i = 0;
140     for (i=0; i<1; i++)
141     {
142         //链表的顺序
143         sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
144         if (sockfd < 0)
145         {
146             ret = errno;
147             printf("func socket() err:  %d
", ret);
148             return ret;
149         }
150         tmp->sockfd = sockfd;
151     }
152     */
153 
154     *handle = tmp; 
155     return ret;
156 }
157 
158 /**
159  * activate_noblock - 设置I/O为非阻塞模式
160  * @fd: 文件描符符
161  */
162 int activate_nonblock(int fd)
163 {
164     int ret = 0;
165     int flags = fcntl(fd, F_GETFL);
166     if (flags == -1)
167     {
168         ret = flags;
169         printf("func activate_nonblock() err:%d", ret);
170         return ret;
171     }
172         
173 
174     flags |= O_NONBLOCK;
175     ret = fcntl(fd, F_SETFL, flags);
176     if (ret == -1)
177     {
178         printf("func activate_nonblock() err:%d", ret);
179         return ret;
180     }
181     return ret;
182 }
183 
184 /**
185  * deactivate_nonblock - 设置I/O为阻塞模式
186  * @fd: 文件描符符
187  */
188 int deactivate_nonblock(int fd)
189 {
190     int ret = 0;
191     int flags = fcntl(fd, F_GETFL);
192     if (flags == -1)
193     {
194         ret = flags;
195         printf("func deactivate_nonblock() err:%d", ret);
196         return ret;
197     }
198 
199     flags &= ~O_NONBLOCK;
200     ret = fcntl(fd, F_SETFL, flags);
201     if (ret == -1)
202     {
203         printf("func deactivate_nonblock() err:%d", ret);
204         return ret;
205     }
206     return ret;
207 }
208 
209 
210 
211 /**
212  * connect_timeout - connect
213  * @fd: 套接字
214  * @addr: 要连接的对方地址
215  * @wait_seconds: 等待超时秒数，如果为0表示正常模式
216  * 成功（未超时）返回0，失败返回-1，超时返回-1并且errno = ETIMEDOUT
217  */
218 static int connect_timeout(int fd, struct sockaddr_in *addr, unsigned int wait_seconds)
219 {
220     int ret;
221     socklen_t addrlen = sizeof(struct sockaddr_in);
222 
223     if (wait_seconds > 0)
224         activate_nonblock(fd);
225 
226     ret = connect(fd, (struct sockaddr*)addr, addrlen);
227     if (ret < 0 && errno == EINPROGRESS)
228     {
229         //printf("11111111111111111111
");
230         fd_set connect_fdset;
231         struct timeval timeout;
232         FD_ZERO(&connect_fdset);
233         FD_SET(fd, &connect_fdset);
234         timeout.tv_sec = wait_seconds;
235         timeout.tv_usec = 0;
236         do
237         {
238             // 一但连接建立，则套接字就可写  所以connect_fdset放在了写集合中
239             ret = select(fd + 1, NULL, &connect_fdset, NULL, &timeout);
240         } while (ret < 0 && errno == EINTR);
241         if (ret == 0)
242         {
243             ret = -1;
244             errno = ETIMEDOUT;
245         }
246         else if (ret < 0)
247             return -1;
248         else if (ret == 1)
249         {
250             //printf("22222222222222222
");
251             /* ret返回为1（表示套接字可写），可能有两种情况，一种是连接建立成功，一种是套接字产生错误，*/
252             /* 此时错误信息不会保存至errno变量中，因此，需要调用getsockopt来获取。 */
253             int err;
254             socklen_t socklen = sizeof(err);
255             int sockoptret = getsockopt(fd, SOL_SOCKET, SO_ERROR, &err, &socklen);
256             if (sockoptret == -1)
257             {
258                 return -1;
259             }
260             if (err == 0)
261             {
262                 //printf("3333333333333
");
263                 ret = 0;
264             }
265             else
266             {
267                 //printf("4444444444444444:%d
", err);
268                 errno = err;
269                 ret = -1;
270             }
271         }
272     }
273     if (wait_seconds > 0)
274     {
275         deactivate_nonblock(fd);
276     }
277     return ret;
278 }
279 
280 
281 
282 //
283 int sckCliet_getconn(void *handle, char *ip, int port, int *connfd)
284 {
285     
286     int ret = 0;
287     SckHandle  *tmp = NULL;
288     if (handle == NULL || ip==NULL || connfd==NULL || port<0 || port>65537)
289     {
290         ret = Sck_ErrParam;
291         printf("func sckCliet_getconn() err: %d, check  (handle == NULL || ip==NULL || connfd==NULL || port<0 || port>65537) 
", ret);
292         return ret;
293     }
294     
295     //
296     int sockfd;
297     sockfd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
298     if (sockfd < 0)
299     {
300         ret = errno;
301         printf("func socket() err:  %d
", ret);
302         return ret;
303     }
304     
305     struct sockaddr_in servaddr;
306     memset(&servaddr, 0, sizeof(servaddr));
307     servaddr.sin_family = AF_INET;
308     servaddr.sin_port = htons(port);
309     servaddr.sin_addr.s_addr = inet_addr(ip);
310     
311     tmp = (SckHandle* )handle;
312 
313     /*
314     ret = connect(sockfd, (struct sockaddr*) (&servaddr), sizeof(servaddr));
315     if (ret < 0)
316     {
317         ret = errno;
318         printf("func connect() err:  %d
", ret);
319         return ret;
320     }
321     */
322     
323     ret = connect_timeout(sockfd, (struct sockaddr_in*) (&servaddr), (unsigned int )tmp->contime);
324     if (ret < 0)
325     {
326         if (ret==-1 && errno == ETIMEDOUT)
327         {
328             ret = Sck_ErrTimeOut;
329             return ret;
330         }
331         else
332         {
333             printf("func connect_timeout() err:  %d
", ret);
334         }
335     }
336     
337     *connfd = sockfd;
338    
339        return ret;
340     
341 }
342 
343 
344 
345 /**
346  * write_timeout - 写超时检测函数，不含写操作
347  * @fd: 文件描述符
348  * @wait_seconds: 等待超时秒数，如果为0表示不检测超时
349  * 成功（未超时）返回0，失败返回-1，超时返回-1并且errno = ETIMEDOUT
350  */
351 int write_timeout(int fd, unsigned int wait_seconds)
352 {
353     int ret = 0;
354     if (wait_seconds > 0)
355     {
356         fd_set write_fdset;
357         struct timeval timeout;
358 
359         FD_ZERO(&write_fdset);
360         FD_SET(fd, &write_fdset);
361 
362         timeout.tv_sec = wait_seconds;
363         timeout.tv_usec = 0;
364         do
365         {
366             ret = select(fd + 1, NULL, &write_fdset, NULL, &timeout);
367         } while (ret < 0 && errno == EINTR);
368 
369         if (ret == 0)
370         {
371             ret = -1;
372             errno = ETIMEDOUT;
373         }
374         else if (ret == 1)
375             ret = 0;
376     }
377 
378     return ret;
379 }
380 
381 
382 //客户端发送报文
383 int sckClient_send(void *handle, int  connfd,  unsigned char *data, int datalen)
384 {
385     int     ret = 0;
386     
387     SckHandle  *tmp = NULL;
388     tmp = (SckHandle *)handle;
389     ret = write_timeout(connfd, tmp->sendtime);
390     if (ret == 0)
391     {
392         int writed = 0;
393         unsigned char *netdata = ( unsigned char *)malloc(datalen + 4);
394         if ( netdata == NULL)
395         {
396             ret = Sck_ErrMalloc;
397             printf("func sckClient_send() mlloc Err:%d
 ", ret);
398             return ret;
399         }
400         int netlen = htonl(datalen);
401         memcpy(netdata, &netlen, 4);
402         memcpy(netdata+4, data, datalen);
403         
404         writed = writen(connfd, netdata, datalen + 4);
405         if (writed < (datalen + 4) )
406         {
407             if (netdata != NULL) 
408             {
409                 free(netdata);
410                 netdata = NULL;
411             }
412             return writed;
413         }
414           
415     }
416     
417     if (ret < 0)
418     {
419         //失败返回-1，超时返回-1并且errno = ETIMEDOUT
420         if (ret == -1 && errno == ETIMEDOUT)
421         {
422             ret = Sck_ErrTimeOut;
423             printf("func sckClient_send() mlloc Err:%d
 ", ret);
424             return ret;
425         }
426         return ret;
427     }
428     
429     return ret;
430 }
431 
432 
433 
434 /**
435  * read_timeout - 读超时检测函数，不含读操作
436  * @fd: 文件描述符
437  * @wait_seconds: 等待超时秒数，如果为0表示不检测超时
438  * 成功（未超时）返回0，失败返回-1，超时返回-1并且errno = ETIMEDOUT
439  */
440 int read_timeout(int fd, unsigned int wait_seconds)
441 {
442     int ret = 0;
443     if (wait_seconds > 0)
444     {
445         fd_set read_fdset;
446         struct timeval timeout;
447 
448         FD_ZERO(&read_fdset);
449         FD_SET(fd, &read_fdset);
450 
451         timeout.tv_sec = wait_seconds;
452         timeout.tv_usec = 0;
453         
454         //select返回值三态
455         //1 若timeout时间到（超时），没有检测到读事件 ret返回=0
456         //2 若ret返回<0 &&  errno == EINTR 说明select的过程中被别的信号中断（可中断睡眠原理）
457         //2-1 若返回-1，select出错
458         //3 若ret返回值>0 表示有read事件发生，返回事件发生的个数
459         
460         do
461         {
462             ret = select(fd + 1, &read_fdset, NULL, NULL, &timeout);
463         } while (ret < 0 && errno == EINTR); 
464 
465         if (ret == 0)
466         {
467             ret = -1;
468             errno = ETIMEDOUT;
469         }
470         else if (ret == 1)
471             ret = 0;
472     }
473 
474     return ret;
475 }
476 
477 //客户端端接受报文
478 int sckClient_rev(void *handle,  int  connfd, unsigned char *out, int *outlen)
479 {
480     
481     int        ret = 0;
482     SckHandle *tmpHandle = (SckHandle *)handle;
483     
484     if (handle==NULL || out==NULL)
485     {
486         ret = Sck_ErrParam;
487         printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
488         return ret;
489     }
490     
491     ret =  read_timeout(connfd, tmpHandle->revtime ); //bugs modify bombing
492     if (ret != 0)
493     {
494         if (ret==-1 || errno == ETIMEDOUT)
495         {
496             ret = Sck_ErrTimeOut;
497             printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
498             return ret;
499         }
500         else
501         {
502             printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
503             return ret;
504         }    
505     }
506     
507     int netdatalen = 0;
508     ret = readn(connfd, &netdatalen,  4); //读包头 4个字节
509     if (ret == -1)
510     {
511         printf("func readn() err:%d 
", ret);
512         return ret;
513     }
514     else if (ret < 4)
515     {
516         ret = Sck_ErrPeerClosed;
517         printf("func readn() err peer closed:%d 
", ret);
518         return ret;
519     }
520     
521     int n;
522     n = ntohl(netdatalen);
523     ret = readn(connfd, out, n); //根据长度读数据
524     if (ret == -1)
525     {
526         printf("func readn() err:%d 
", ret);
527         return ret;
528     }
529     else if (ret < n)
530     {
531         ret = Sck_ErrPeerClosed;
532         printf("func readn() err peer closed:%d 
", ret);
533         return ret;
534     }
535     
536     *outlen = n;
537     
538     return 0;
539 }
540 
541 // 客户端环境释放 
542 int sckClient_destroy(void *handle)
543 {
544     if (handle != NULL)
545     {
546         free(handle);
547     }
548     return 0;
549 }
550 
551 int sckCliet_closeconn(int connfd)
552 {
553     if (connfd >=0 )
554     {
555         close(connfd);
556     }
557     return 0;
558 }
559 
560 
561 
562 /////////////////////////////////////////////////////////////////////////////////////
563 //函数声明
564 //服务器端初始化
565 int sckServer_init(int port, int *listenfd)
566 {
567     int     ret = 0;
568     int mylistenfd;
569     struct sockaddr_in servaddr;
570     memset(&servaddr, 0, sizeof(servaddr));
571     servaddr.sin_family = AF_INET;
572     servaddr.sin_port = htons(port);
573     servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
574     
575         
576     mylistenfd = socket(PF_INET, SOCK_STREAM, 0);
577     if (mylistenfd < 0)
578     {
579         ret = errno ;
580         printf("func socket() err:%d 
", ret);
581         return ret;
582     }
583         
584 
585     int on = 1;
586     ret = setsockopt(mylistenfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on) );
587     if (ret < 0)
588     {
589         ret = errno ;
590         printf("func setsockopt() err:%d 
", ret);
591         return ret;
592     }
593     
594 
595     ret = bind(mylistenfd, (struct sockaddr*)&servaddr, sizeof(servaddr));
596     if (ret < 0)
597     {
598         ret = errno ;
599         printf("func bind() err:%d 
", ret);
600         return ret;
601     }
602         
603     ret = listen(mylistenfd, SOMAXCONN);
604     if (ret < 0)
605     {
606         ret = errno ;
607         printf("func listen() err:%d 
", ret);
608         return ret;
609     }
610         
611     *listenfd = mylistenfd;
612 
613     return 0;
614 }
615 
616 /**
617  * accept_timeout - 带超时的accept
618  * @fd: 套接字
619  * @addr: 输出参数，返回对方地址
620  * @wait_seconds: 等待超时秒数，如果为0表示正常模式
621  * 成功（未超时）返回已连接套接字，超时返回-1并且errno = ETIMEDOUT
622  */
623 int accept_timeout(int fd, struct sockaddr_in *addr, unsigned int wait_seconds)
624 {
625     int ret;
626     socklen_t addrlen = sizeof(struct sockaddr_in);
627 
628     if (wait_seconds > 0)
629     {
630         fd_set accept_fdset;
631         struct timeval timeout;
632         FD_ZERO(&accept_fdset);
633         FD_SET(fd, &accept_fdset);
634         timeout.tv_sec = wait_seconds;
635         timeout.tv_usec = 0;
636         do
637         {
638             ret = select(fd + 1, &accept_fdset, NULL, NULL, &timeout);
639         } while (ret < 0 && errno == EINTR);
640         if (ret == -1)
641             return -1;
642         else if (ret == 0)
643         {
644             errno = ETIMEDOUT;
645             return -1;
646         }
647     }
648 
649     //一但检测出 有select事件发生，表示对等方完成了三次握手，客户端有新连接建立
650     //此时再调用accept将不会堵塞
651     if (addr != NULL)
652         ret = accept(fd, (struct sockaddr*)addr, &addrlen); //返回已连接套接字
653     else
654         ret = accept(fd, NULL, NULL);
655         if (ret == -1)
656         {
657             ret = errno;
658             printf("func accept() err:%d 
", ret);
659             return ret;
660         }
661     
662 
663     return ret;
664 }
665 
666 int sckServer_accept(int listenfd, int *connfd,  int timeout)
667 {
668     int    ret = 0;
669     
670     ret = accept_timeout(listenfd, NULL, (unsigned int) timeout);
671     if (ret < 0)
672     {
673         if (ret == -1 && errno == ETIMEDOUT)
674         {
675             ret = Sck_ErrTimeOut;
676             //printf("func accept_timeout() timeout err:%d 
", ret);
677             return ret;
678         }
679         else
680         {
681             ret = errno;
682             printf("func accept_timeout() err:%d 
", ret);
683             return ret;
684         }
685     }
686     
687     *connfd = ret;
688     return 0;
689 }
690 //服务器端发送报文
691 int sckServer_send(int connfd,  unsigned char *data, int datalen, int timeout)
692 {
693     int     ret = 0;
694     
695     ret = write_timeout(connfd, timeout);
696     if (ret == 0)
697     {
698         int writed = 0;
699         unsigned char *netdata = ( unsigned char *)malloc(datalen + 4);
700         if ( netdata == NULL)
701         {
702             ret = Sck_ErrMalloc;
703             printf("func sckServer_send() mlloc Err:%d
 ", ret);
704             return ret;
705         }
706         int netlen = htonl(datalen);
707         memcpy(netdata, &netlen, 4);
708         memcpy(netdata+4, data, datalen);
709         
710         writed = writen(connfd, netdata, datalen + 4);
711         if (writed < (datalen + 4) )
712         {
713             if (netdata != NULL) 
714             {
715                 free(netdata);
716                 netdata = NULL;
717             }
718             return writed;
719         }
720           
721     }
722     
723     if (ret < 0)
724     {
725         //失败返回-1，超时返回-1并且errno = ETIMEDOUT
726         if (ret == -1 && errno == ETIMEDOUT)
727         {
728             ret = Sck_ErrTimeOut;
729             printf("func sckServer_send() mlloc Err:%d
 ", ret);
730             return ret;
731         }
732         return ret;
733     }
734     
735     return ret;
736 }
737 //服务器端端接受报文
738 int sckServer_rev(int  connfd, unsigned char *out, int *outlen,  int timeout)
739 {
740         
741     int        ret = 0;
742     
743     if (out==NULL || outlen==NULL)
744     {
745         ret = Sck_ErrParam;
746         printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
747         return ret;
748     }
749     
750     ret =  read_timeout(connfd, timeout); //bugs modify bombing
751     if (ret != 0)
752     {
753         if (ret==-1 || errno == ETIMEDOUT)
754         {
755             ret = Sck_ErrTimeOut;
756             printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
757             return ret;
758         }
759         else
760         {
761             printf("func sckClient_rev() timeout , err:%d 
", Sck_ErrTimeOut);
762             return ret;
763         }    
764     }
765     
766     int netdatalen = 0;
767     ret = readn(connfd, &netdatalen,  4); //读包头 4个字节
768     if (ret == -1)
769     {
770         printf("func readn() err:%d 
", ret);
771         return ret;
772     }
773     else if (ret < 4)
774     {
775         ret = Sck_ErrPeerClosed;
776         printf("func readn() err peer closed:%d 
", ret);
777         return ret;
778     }
779     
780     int n;
781     n = ntohl(netdatalen);
782     ret = readn(connfd, out, n); //根据长度读数据
783     if (ret == -1)
784     {
785         printf("func readn() err:%d 
", ret);
786         return ret;
787     }
788     else if (ret < n)
789     {
790         ret = Sck_ErrPeerClosed;
791         printf("func readn() err peer closed:%d 
", ret);
792         return ret;
793     }
794     
795     *outlen = n;
796     
797     return 0;
798 }
799 
800 //服务器端环境释放 
801 int sckServer_destroy(void *handle)
802 {
803     return 0;
804 }

服务器：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 #include <signal.h>
  4 #include <sys/wait.h>
  5 
  6 
  7 #include <stdlib.h>
  8 #include <stdio.h>
  9 #include <errno.h>
 10 #include <string.h>
 11 #include <pthread.h>
 12 
 13 #include "commsocket.h"
 14 
 15 #include "myipc_sem.h"
 16 #include "myipc_shm.h"
 17 
 18 pthread_mutex_t mymutex = PTHREAD_MUTEX_INITIALIZER;
 19 
 20 
 21 int g_key = 0x3333;
 22 
 23 #define ERR_EXIT(m) 
 24         do 
 25         { 
 26                 perror(m); 
 27                 exit(EXIT_FAILURE); 
 28         } while(0)
 29         
 30         
 31 #include <signal.h>
 32 
 33 void handle(int signum)
 34 {
 35     int pid = 0;
 36     printf("recv signum:%d 
", signum);
 37     
 38     //避免僵尸进程
 39     while ((pid = waitpid(-1, NULL, WNOHANG) ) > 0)
 40     {
 41         printf("退出子进程pid%d 
", pid);
 42         fflush(stdout);
 43     } 
 44 }
 45 
 46 int srvInit()
 47 {
 48     //共享内存创建
 49     int        ret = 0;
 50     int     shmhdl = 0;
 51     ret = IPC_CreatShm(".", sizeof(int), &shmhdl);
 52     if (ret != 0)
 53     {
 54         printf("func IPC_CreatShm() err:%d 
", ret);
 55         return ret;
 56     }
 57     
 58     
 59     //信号量的创建
 60      int      semid = 0;
 61     ret = sem_creat(g_key, &semid);
 62     if (ret != 0)
 63     {
 64         printf("func sem_creat() err:%d,重新按照open打开信号量 
", ret);
 65         if (ret == SEMERR_EEXIST)
 66         {
 67             ret = sem_open(g_key, &semid);
 68             if (ret != 0)
 69             {
 70                 printf("按照打开的方式，重新获取sem失败:%d 
", ret);
 71                 return ret;
 72             }
 73         }
 74         else
 75         {
 76             return ret;
 77         }
 78         
 79     }
 80     
 81     int  val = 0;
 82     ret = sem_getval(semid, &val);
 83     if (ret != 0 )
 84     {
 85         printf("func sem_getval() err:%d 
", ret);
 86         return ret;
 87     }
 88     printf("sem val:%d
", val);
 89     return 0;
 90     
 91 }
 92 
 93 
 94 void TestFunc_sem()
 95 {
 96     int ncount = 0;
 97     int ret = 0;
 98     int shmhdl = 0;
 99     int *addr = NULL;
100     
101     int semid = 0;
102     sem_open(g_key, &semid);
103 
104 
105      sem_p(semid); //临界区开始
106      
107     //
108         ret = IPC_CreatShm(".", 0, &shmhdl);
109         
110         ret =IPC_MapShm(shmhdl, (void **)&addr);
111         *((int *)addr) =  *((int *)addr)  + 1;
112         ncount = *((int *)addr);
113         printf("ncount:%d
", ncount);
114         //addr[0] = addr[0] +1;
115         ret =IPC_UnMapShm(addr);
116         //sleep(2);
117         
118     sem_v(semid);  //临界区开始
119     //
120     //printf("进程正常退出:%d
", getpid());
121 }    
122 
123 
124 void TestFunc_mutex()
125 {
126     int ncount = 0;
127     int ret = 0;
128     int shmhdl = 0;
129     int *addr = NULL;
130     
131     int semid = 0;
132     sem_open(g_key, &semid);
133 
134 
135      //sem_p(semid); //临界区开始
136      pthread_mutex_lock(&mymutex);
137      
138     //
139         ret = IPC_CreatShm(".", 0, &shmhdl);
140         
141         ret =IPC_MapShm(shmhdl, (void **)&addr);
142         *((int *)addr) =  *((int *)addr)  + 1;
143         ncount = *((int *)addr);
144         printf("ncount:%d
", ncount);
145         //addr[0] = addr[0] +1;
146         ret =IPC_UnMapShm(addr);
147         //sleep(2);
148         
149     //sem_v(semid);  //临界区开始
150     pthread_mutex_unlock(&mymutex);
151     //
152     //printf("进程正常退出:%d
", getpid());
153 }    
154 
155 
156 void *thread_routine(void* arg)
157 {
158     int     connfd = 0;
159     int     ret = 0;
160     
161     pthread_detach(pthread_self());
162     
163     if (arg == NULL)
164     {
165         return NULL;
166     }
167     connfd = *((int *)arg);
168     free(arg);
169 
170     unsigned char     recvbuf[1024];
171     int         recvbuflen = 1024;
172     int         wait_seconds = 5;
173         
174     
175     while(1)
176     {
177         memset(recvbuf, 0, sizeof(recvbuf));
178         ret = sckServer_rev(connfd, recvbuf, &recvbuflen,  wait_seconds);
179         if (ret != 0)
180         {
181             if (ret == Sck_ErrTimeOut)
182             {
183                 continue;
184             }
185             printf("func sckServer_rev() err:%d 
", ret);
186             break;
187         }
188         
189         TestFunc_mutex();
190         printf("recvbuf:%s
", recvbuf);
191         
192         //
193         ret = sckServer_send(connfd,  recvbuf, recvbuflen, wait_seconds);
194         if (ret != 0)
195         {
196             printf("func sckServer_send() err:%d 
", ret);
197             break;
198         }
199     }
200     close(connfd);
201     return NULL;    
202 }
203 
204 int main(void)
205 {
206     int        ret = 0;
207     int     listenfd;
208     
209     
210     signal(SIGCHLD, handle);
211     signal(SIGPIPE, SIG_IGN);
212     
213     //完成共享内存和信号量的创建
214     srvInit();
215 
216     ret = sckServer_init(8001, &listenfd);
217     if (ret != 0)
218     {
219         printf("sckServer_init() err:%d 
", ret);
220         return ret;
221     }
222     
223     while(1)
224     {
225         int ret = 0;
226         int wait_seconds = 5;
227         int connfd = 0;
228 
229         ret = sckServer_accept(listenfd, &connfd,  wait_seconds);
230         if (ret == Sck_ErrTimeOut)
231         {
232             //printf("timeout....
");
233             continue;
234         }
235         int tid = 0;
236         
237         int *pCon = (int *)malloc(sizeof(int)) ; 
238         *pCon = connfd;
239         
240         //每来一个连接，需要启动I个线程，线程需要收发报文 
241         pthread_create(&tid, NULL, thread_routine, (void *)pCon);
242 
243     }
244     
245 
246     return 0;
247 }

客户端：

  1 #include <unistd.h>
  2 #include <sys/types.h>
  3 //#include <sys/socket.h>
  4 //#include <netinet/in.h>
  5 //#include <arpa/inet.h>
  6 #include <signal.h>
  7 #include <sys/wait.h>
  8 //#include "sckutil.h"
  9 
 10 #include <stdlib.h>
 11 #include <stdio.h>
 12 #include <errno.h>
 13 #include <string.h>
 14 
 15 #include "commsocket.h"
 16 
 17 void handle(int signum)
 18 {
 19     int pid = 0;
 20     printf("recv signum:%d 
", signum);
 21     
 22     //避免僵尸进程
 23     while ((pid = waitpid(-1, NULL, WNOHANG) ) > 0)
 24     {
 25         printf("退出子进程pid%d 
", pid);
 26         fflush(stdout);
 27     } 
 28 }
 29 
 30 
 31 
 32 int main()
 33 {    
 34     int         ret = 0;
 35     void         *handle = NULL;
 36     //void         handle = NULL;
 37     int         connfd;
 38     int                 i = 0, j = 0;
 39     
 40     signal(SIGCHLD, handle);
 41     signal(SIGPIPE, SIG_IGN); //防止 sokcet破裂
 42     
 43     int procnum=10;
 44     int loopnum = 100;
 45     
 46     pthread_t tidArray[1024*2];
 47     
 48 
 49 
 50     printf("请输入要创建子进程的个数 : 
");
 51     scanf("%d", &procnum);
 52 
 53     printf("请输入让每个子进程测试多少次 :
");
 54     scanf("%d", &loopnum);
 55     
 56         
 57      unsigned char *data = (unsigned char *)"aaaaaafffffffffffssssss";
 58      int         datalen = 10;
 59      
 60      unsigned char out[1024];
 61      int outlen = 1024;
 62     //客户端环境初始化
 63     
 64     ret = sckCliet_init(&handle, 15, 5, 5, 10);
 65 
 66     for (i=0; i<procnum; i++)
 67     {
 68         int pid = fork();
 69         if (pid == 0)
 70         {
 71             ret = sckCliet_getconn(handle, "127.0.0.1", 8001, &connfd);
 72             for (j=0; j<loopnum; j++)
 73             {
 74                 //客户端发送报文
 75                 ret = sckClient_send(handle,  connfd, data, datalen);
 76                 if (ret != 0)
 77                 {
 78                     if (ret == Sck_ErrTimeOut)
 79                     {
 80                         continue;
 81                     }
 82                     break;
 83                 }
 84                 //printf("ccccccc
");
 85                     //客户端端接受报文
 86                 ret = sckClient_rev(handle, connfd, out, &outlen); //10
 87                 if (ret != 0)
 88                 {
 89                     if (ret == Sck_ErrTimeOut)
 90                     {
 91                         break; 
 92                     }
 93                     break;
 94                 }
 95                 out[outlen] = '';
 96             
 97                 printf("out: %s 
", out);
 98             }
 99             
100             close(connfd);
101             exit(0); //让子进程退出，不参与fork
102         }
103     }
104     
105 
106     // 客户端环境释放 
107     ret = sckClient_destroy(handle);
108     
109     //避免僵尸进程
110     int mypid;
111     while ((mypid = waitpid(-1, NULL, WNOHANG) ) > 0)
112     {
113         printf("退出子进程pid%d 
", mypid);
114         fflush(stdout);
115     } 
116 
117 }

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原文地址：https://www.cnblogs.com/wanmeishenghuo/p/9457764.html