1> 使用無名管道完成父子進程間的通信

#include<myhead.h>int main(int argc, const char *argv[])
{//創建存放兩個文件描述符的數組int fd[2];int pid = -1;//打開無名管道if(pipe(fd) == -1){perror("pipe");return -1;}//創建子進程pid = fork();if(pid > 0){//父進程//關閉讀端close(fd[0]);char buf[128]="";while(1){printf("請輸入：");fgets(buf,sizeof(buf),stdin);buf[strlen(buf)-1] = 0;write(fd[1],buf,strlen(buf));if(strcmp(buf,"quit") == 0){break;}}close(fd[1]);}else if(pid == 0){//子進程close(fd[1]);char buf[128]="";while(1){bzero(buf,sizeof(buf));read(fd[0],buf,sizeof(buf));printf("輸出是：%s\n",buf);if(strcmp(buf,"quit") == 0){break;}}close(fd[0]);}else{perror("fork");return -1;}wait(NULL);return 0;
}

?效果圖:

2> 使用標準IO完成兩個文件的拷貝

#include<myhead.h>int main(int argc, const char *argv[])
{FILE* rfile;FILE* wfile;if((rfile = fopen("./01test.c","r")) == NULL){perror("fopen");return -1;}if((wfile = fopen("./02test.txt","w")) == NULL){perror("fopen");return -1;}char buf[128]="";int res = 0;while(1){res = fread(buf,1,sizeof(buf),rfile);if(res == 0 || res == -1){break;}fwrite(buf,res,1,wfile);}fclose(rfile);fclose(wfile);return 0;
}

?效果圖:

3> 使用文件IO實現兩個文件的拷貝

#include<myhead.h>int main(int argc, const char *argv[])
{pid_t rpid = -1;pid_t wpid = -1;if((rpid = open("./01test.c",O_RDONLY))==-1){perror("open");return -1;}if((wpid = open("./03test.txt",O_WRONLY | O_CREAT | O_TRUNC,0664))==-1){perror("open");return -1;}char buf[128]="";int res = 0;while(1){bzero(buf,sizeof(buf));res = read(rpid,buf,sizeof(buf));if(res == 0||res == -1){break;}write(wpid,buf,res);}close(rpid);close(wpid);return 0;
}

?效果圖:

4> 使用多進程完成兩個文件的拷貝

#include<myhead.h>int main(int argc, const char *argv[])
{pid_t pid = -1;int rfd = -1;int wfd = -1;if((rfd = open("./01test.c",O_RDONLY))==-1){perror("open");return -1;}if((wfd = open("./04test.txt",O_WRONLY|O_CREAT|O_TRUNC,0664))==-1){perror("open");return -1;}int len = lseek(rfd,0,SEEK_END);pid = fork();if(pid > 0){	lseek(rfd,0,SEEK_SET);lseek(wfd,0,SEEK_SET);char buf[128]="";int res = -1;int num = 0;while(1){	res = read(rfd,buf,sizeof(buf));num += res;if(num > len/2||res == 0){write(wfd,buf,res-(num-len/2));break;}write(wfd,buf,res);}close(rfd);close(wfd);wait(NULL);}else if(pid == 0){lseek(rfd,len/2,SEEK_SET);lseek(wfd,len/2,SEEK_SET);char buf[128]="";int res = -1;int num = 0;while(1){	res = read(rfd,buf,sizeof(buf));num += res;if(num > (len-len/2) || res == 0){write(wfd,buf,res-(num-len/2));break;}write(wfd,buf,res);}close(rfd);close(wfd);exit(EXIT_SUCCESS);}else{perror("fork");return -1;}return 0;
}

?效果圖:

5> 使用多線程完成兩個文件的拷貝

#include<myhead.h>
typedef struct
{const char* srcfile;const char* destfile;int place;int offset;
}arg;void* read_file(void* aarg)
{arg ofile=*((arg*)aarg);printf(" %s %s %d %d\n",ofile.srcfile,ofile.destfile,ofile.place,ofile.offset);int  rfd = -1;int  wfd = -1;if((rfd = open(ofile.srcfile,O_RDONLY))==-1){perror("open");pthread_exit(NULL);}if((wfd = open(ofile.destfile,O_WRONLY|O_CREAT,0664))==-1){perror("open");pthread_exit(NULL);}lseek(rfd,ofile.place,SEEK_SET);lseek(wfd,ofile.place,SEEK_SET);char buf[128]="";int res = 0;int num = 0;while(1){bzero(buf,sizeof(buf));res = read(rfd,buf,sizeof(buf));num += res;if(num >= ofile.offset||res == 0){write(wfd,buf,res-(num-ofile.offset));break;}write(wfd,buf,res);}		close(rfd);close(wfd);pthread_exit(NULL);}int main(int argc, const char *argv[])
{pthread_t rtid = -1;pthread_t wtid = -1;pid_t fd = -1;if((fd = open(argv[1],O_RDONLY))==-1){perror("open");return -1;}int len = lseek(fd,0,SEEK_END);close(fd);arg ofile_information={argv[1],argv[2],0,len/2};if((pthread_create(&rtid,NULL,read_file,&ofile_information)) != 0){perror("pthread_creat");return -1;}arg tfile_information={argv[1],argv[2],len/2,len-(len/2)};if((pthread_create(&wtid,NULL,read_file,&tfile_information)) != 0){perror("pthread_creat");return -1;}pthread_join(rtid,NULL);pthread_join(wtid,NULL);return 0;
}

?

效果圖:

6> 將互斥鎖的案例重新寫一遍

#include<myhead.h>pthread_mutex_t mutex;
int money = 5000;void* cost(void* arg)
{while(1){pthread_mutex_lock(&mutex);money -= 50; printf("小王花了50,還剩%d\n",money);pthread_mutex_unlock(&mutex);sleep(1);}pthread_exit(NULL);
}int main(int argc, const char *argv[])
{pthread_t tid;//初始化pthread_mutex_init(&mutex,NULL);if(pthread_create(&tid,NULL,cost,NULL) != 0){perror("pthread_create");return -1;}//上鎖while(1){sleep(1);pthread_mutex_lock(&mutex);money -= 100;printf("小張花了100，還剩:%d\n",money);pthread_mutex_unlock(&mutex);}pthread_mutex_destroy(&mutex);pthread_join(tid,NULL);return 0;
}

?效果圖:

7> 將無名信號量實現生產者消費者程序重新實現一遍

#include<myhead.h>sem_t sem;void* task1(void* arg)
{while(1){printf("我生產了\n");sem_post(&sem);sleep(1);}pthread_exit(NULL);
}void* task2(void* arg)
{while(1){sem_wait(&sem);printf("我消費了\n");//sem_post(&sem);sleep(1);}pthread_exit(NULL);
}int main(int argc, const char *argv[])
{pthread_t tid1;pthread_t tid2;//初始化sem_init(&sem,0,0);if(pthread_create(&tid1,NULL,task1,NULL) != 0){perror("pthread_create");return -1;}if(pthread_create(&tid2,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}sem_destroy(&sem);pthread_join(tid1,NULL);pthread_join(tid2,NULL);return 0;
}

效果圖:

8> 將條件變量實現生產者消費者程序重新實現一遍

#include<myhead.h>pthread_cond_t cond;
pthread_mutex_t mutex;void* task1(void* arg)
{while(1){printf("生產了一個\n");pthread_cond_signal(&cond);sleep(1);}
}void* task2(void* arg)
{while(1){pthread_mutex_lock(&mutex);pthread_cond_wait(&cond,&mutex);printf("%#lx消費了一個\n",pthread_self());pthread_mutex_unlock(&mutex);sleep(1);}
}int main(int argc, const char *argv[])
{pthread_t tid1,tid2,tid3,tid4,tid5,tid6;//初始化pthread_cond_init(&cond,NULL);pthread_mutex_init(&mutex,NULL);//生產線if(pthread_create(&tid1,NULL,task1,NULL) != 0){perror("pthread_create");return -1;}//消費線if(pthread_create(&tid2,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}if(pthread_create(&tid3,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}if(pthread_create(&tid4,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}if(pthread_create(&tid5,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}if(pthread_create(&tid6,NULL,task2,NULL) != 0){perror("pthread_create");return -1;}pthread_join(tid1,NULL);pthread_join(tid2,NULL);pthread_join(tid3,NULL);pthread_join(tid4,NULL);pthread_join(tid5,NULL);pthread_join(tid6,NULL);pthread_cond_destroy(&cond);pthread_mutex_destroy(&mutex);return 0;
}

效果圖: