Linux下的程序、進程和線程

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概念

1. Linux環境下的進程

   • 進程的產生

     • 複製父進程的環境配置
     • 在內核中建立進程結構
     • 將結構插入進程列表
     • 分配資源
     • 複製父進程的內存映射信息
     • 管理文件描述符和鏈接點
     • 通知父進程

   • 進程的終止

     • main函數返回
     • 調用exit
     • 調用_exit
     • 調用abort
     • 由一個信號終止

     進程終止將釋放其擁有的資源

2. 線程和進程的主要區別是進程是操作系統資源分配的基本單位，擁有完整的虛擬空間。

   線程則除了CPU資源，所有的資源都是要與進程中的其他線程共享資源，不單獨分配資源。

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進程產生的方式

以下函數大部分都要導入

#include <sys/types.h> //包含了大部分的引申的數據類型的庫，如ssize_t,pid_t等
#include <unistd.h> //unix standard library 

1. 進程號

   getpid()、getppid()函數

   前者返回當前進程的id，後者返回當前進程的父進程的id。返回值類型都為pid_t

2. 複製進程fork()

   fork()函數產生一個新的進程，除了內存之外，其他的信息都與調用該函數進程共享，包括程序計數器，所以在fork後父進程和子進程同步執行接下來的指令。

   在父進程中，fork函數的返回值為子進程的id，在子進程中則返回0

3. system()方式

   system()函數可以在C語言程序中使用外部的shell命令。

   int system(const char * cmdstring) { pid_t pid; int status; if(cmdstring == NULL) { return (1); //如果cmdstring为空，返回非零值，一般为1 } if((pid = fork())<0) { status = -1; //fork失败，返回-1 } else if(pid == 0) //子进程 { execl("/bin/sh", "sh", "-c", cmdstring, (char *)0); _exit(127); // exec执行失败返回127，注意exec只在失败时才返回现在的进程，成功的话现在的进程就不存在啦~~ } else //父进程 { while(waitpid(pid, &status, 0) < 0) { if(errno != EINTR) { status = -1; //如果waitpid被信号中断，则返回-1 break; } } } return status; //如果waitpid成功，则返回子进程的返回状态 } 

   system()源碼如上。在調用system函數後會產生兩個進程，子進程調用execl函數(execl內部執行系統調用execve())執行shell命令，父進程則阻塞等待子進程的執行。

4. 進程執行exec()函數系列

   之前的fork()和system()函數都是新建一個進程來執行操作。exec()族函數則是用新進程代替原來的進程，系統從新進程運行，PID值不變。

5. 初始進程init

   所有進程的祖先，original process

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進程間通信與同步

管道

管道是由内核管理的一个缓冲区，管道的一端连接一个进程的输出，另一端连接一个进程的输入。

在Linux中，管道的实现没有专门的数据结构，而是借助了文件系统的file结构和VFS的索引节点inode。通过将两个 file 结构指向同一个临时的 VFS 索引节点，而这个 VFS 索引节点又指向一个物理页面而实现的。如下图

管道读写时，管道的写函数通过将字节复制到VFS索引节点指向的物理内存而写入数据，管道的读函数就可以通过复制物理内存中的字节而读出数据。

当写进程向管道中写入时，它利用标准的库函数write()，系统根据库函数传递的文件描述符，可找到该文件的 file 结构。file 结构中指定了用来进行写操作的函数（即写入函数）地址，于是，内核调用该函数完成写操作。写入函数在向内存中写入数据之前，必须首先检查 VFS 索引节点中的信息，同时满足如下条件时，才能进行实际的内存复制工作：

• 内存中有足够的空间可容纳所有要写入的数据
• 内存没有被读程序锁定

如果同时满足上述条件，写入函数首先锁定内存，然后从写进程的地址空间中复制数据到内存。否则，写入进程就休眠在 VFS 索引节点的等待队列中，接下来，内核将调用调度程序，而调度程序会选择其他进程运行。写入进程实际处于可中断的等待状态，当内存中有足够的空间可以容纳写入数据，或内存被解锁时，读取进程会唤醒写入进程，这时，写入进程将接收到信号。当数据写入内存之后，内存被解锁，而所有休眠在索引节点的读取进程会被唤醒。

管道的读取过程和写入过程类似。但是，进程可以在没有数据或内存被锁定时立即返回错误信息，而不是阻塞该进程，这依赖于文件或管道的打开模式。反之，进程可以休眠在索引节点的等待队列中等待写入进程写入数据。当所有的进程完成了管道操作之后，管道的索引节点被丢弃，而共享数据页也被释放。

管道的种类：

1. 普通管道：有两种限制，一是只能单向传输，二是只能在父子或兄弟进程间进行通信

2. 半雙工管道

   只能在父子或兄弟进程间使用，可以双向传输

   shell中通過|表示管道，左邊的輸出作為右邊的輸入。

   進程創建管道時，需要創建兩個文件描述符來操作管道，一個讀，一個寫。兩個通信的進程中的讀與寫的描述符相對應。在進程A中設置為讀的描述符，在B中設置為寫。

   pipe()函數

   #include <unistd.h>
   int pipe(int filedes[2]); 

   filedes是一個文件描述符的數組，第1個是讀，第2個是寫。

   pipe寫入數據時，寫入的數據小於128K時是非原子的。當大於128K時，緩衝區的數據會被連續地寫入管道，之後阻塞等待讀進程將所有的數據讀完。

3. 命名管道FIFO

   文件系統中FIFO以設備特殊文件的形式存在，它在文件系统中有对应的路径，当一个进程以读的方式打开该文件，另一个进程以写的方式打开该文件，那么内核就会在这两个进程间建立管道。

   不同的進程可以通過FIFO共享數據

   • 創建FIFO

     shell中：mkfifo fifo_name

     C語言：

     #include <sys/stat.h>
     int mkfifo(const char *pathname, mode_t mode); 

   • FIFO默認狀態下總是處於阻塞狀態，必須使用open()函數來顯式地建立到管道的連接，並且使用O_NONBLOCK標誌

消息隊列

消息隊列時內核空間中的內部鏈錶，通過內核在各個進程間傳遞內容。消息順序地發送到消息隊列中，並以幾種不同的方式從隊列中獲取，每個隊列通過IPC標識符唯一地標識，每個消息隊列中的消息，又構成一個獨立的鏈錶。

每个消息队列都有一个队列头，用结构struct msg_queue来描述。队列头中包含了该消息队列的大量信息，包括消息队列键值、用户ID、组ID、消息队列中消息数目等等，甚至记录了最近对消息队列读写进程的ID。读者可以访问这些信息，也可以设置其中的某些信息。

• 消息緩衝區結構

  #include <linux/msg.h>
  struct msgmbuf { long mtype; //消息類型，用整數表示，可以為某類消息設定一個類型，以區分接收到的不同的消息 char mtext[1]; //消息數據，長度不一定為1 } 

  对于发送消息来说，首先预置一个msgbuf缓冲区并写入消息类型和内容，调用相应的发送函数即可；对读取消息来说，首先分配这样一个msgbuf缓冲区，然后把消息读入该缓冲区即可。

  消息總的大小不能超過8192字節。

• ipc_perm

  內核將IPC對象的許可權限信息放在ipc_perm類型的結構中。

  struct ipc_perm {
      key_t key; //用於區分消息隊列 uid_t uid; //用戶的UID gid_t gid; //用戶組的id uid_t cuid; //建立者的UID gid_t cgid; unsigned short mode; //讀寫控制權限 unsigned short seq; //序列號 }; 

• msqid_ds

  消息队列的信息基本上都保存在消息队列头中，因此，可以分配一个类似于消息队列头的结构(struct msqid_ds)，来返回消息队列的属性；同样可以设置该数据结构。

  每個msqid_ds代表一個系統消息隊列。系統通過struct list_head q_messages來管理消息隊列，一個系統中最優有128個消息隊列。

  struct msqid_ds {
      struct ipc_perm msg_perm;     struct msg *msg_first;      /* first message on queue,unused  */     struct msg *msg_last;       /* last message in queue,unused */     __kernel_time_t msg_stime;  /* last msgsnd time */     __kernel_time_t msg_rtime;  /* last msgrcv time */     __kernel_time_t msg_ctime;  /* last change time */     unsigned long  msg_lcbytes; /* Reuse junk fields for 32 bit */     unsigned long  msg_lqbytes; /* ditto */     unsigned short msg_cbytes;  /* current number of bytes on queue */     unsigned short msg_qnum;    /* number of messages in queue */     unsigned short msg_qbytes;  /* max number of bytes on queue */     __kernel_ipc_pid_t msg_lspid;   /* pid of last msgsnd */     __kernel_ipc_pid_t msg_lrpid;   /* last receive pid */ }; 

  消息隊列便通過msg_first和msg_lasr指針來鏈接頭和尾的消息體，消息體定義如下：

  /* one msg structure for each message */
  struct msg {
  	struct msg *msg_next; /* next message on queue */ long msg_type; char *msg_spot; /* message text address */ time_t msg_stime; /* msgsnd time */ short msg_ts; /* message text size */ }; 

• 內核中的消息隊列的關係

  

• 鍵值構建ftok()函數

  由於共享內存、消息隊列、信號量都是通過中間介質來進行通信的，想要唯一一個介質進程通信，需要指定一個id。ftok()函數用於產生這種id。

  將路徑名和項目的標識符轉變為一個系統V的IPC鍵值

  #include <sys/ipc.h>
  key_t ftok(const char* pathname, int proj_id); 

  pathname是存在且可訪問的文件名，proj_id是隨便指定的一個數，1~255。

  ftok()的返回值是根據pathname對應的文件節點信息和proj_id生成的。文件節點結構為

  //函数：int stat( const char *file_name, struct stat *buf )
  //函数说明：通过文件名filename，获取文件信息，并保存在buf所指的结构体stat中。
  //返回值：成功执行返回0，失败返回-1，错误代码存于errno
  //struct stat结构体的定义如下：
  struct stat { unsigned long st_dev;//文件的设备编号 unsigned long st_ino;//节点 unsigned short st_mode; //文件的类型和存取的权限 unsigned short st_nlink;//连到该文件的硬连接数目，刚建立的文件值为1 unsigned short st_uid; //用户ID unsigned short st_gid; //组ID unsigned long st_rdev; unsigned long st_size; unsigned long st_blksize; unsigned long st_blocks; unsigned long st_atime; unsigned long st_atime_nsec; unsigned long st_mtime; unsigned long st_mtime_nsec; unsigned long st_ctime; unsigned long st_ctime_nsec; unsigned long __unused4; unsigned long __unused5; }; 

  ftok获取的键值是由ftok()函数的第二个参数的后8个bit，st_dev的后两位，st_ino的后四位构成的。

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• 獲得消息隊列id msgget()函數

  #include <sys/msg.h>
  #include <sys/ipc.h> int msgget(key_t key, int msgflag); 

  成功調用返回消息隊列ID

  key即為ftok()創建的key

  msgflag:

  • IPC_CREAT:如果在內核中不存在該隊列，則創建它
  • IPC_EXCL:和IPC_CREAT一起使用時，如果隊列存在就出錯。為了保證沒有一個現存的隊列為了訪問而被打開。

• 發送消息msgsend()函數

  int msgsend(int msqid, const void *msgp, size_t msgsz, int msgflg);

  msqid:消息隊列id

  msgp:指向一個消息緩衝區msgmbuf

  msgz:消息的大小，單位字節，不包括4字節的消息類型

  msgflg:指定設置為IPC_NOWAIT，如果消息隊列已滿就不繼續寫消息。沒有設置則進程阻塞，直到可以繼續寫消息。

• 接受消息msgrcv()函數

  ssize_t msgrcv(int msqid, void *msgp, size_t msgsz,long msgtyp, int msgflg);

  msgtyp表示要從隊列獲取的消息類型，內核將查找隊列中第一個到達的匹配類型的消息。如果傳0表示無論類型，接收最老的消息。

• 消息控制msgctl()函數

  int msgctl(int msqid, int cmd, struct msqid_ds* buf);

  msgctl()函數向內核發送一個cmd命令

  • IPC_STAT:獲取隊列的msqid_ds結構放置于buf中
  • IPC_SET:設置隊列的msqid_ds結構的ipc_perm成員值，值從buf中獲得。
  • IPC_RMID:內核刪除隊列。

1. 消息隊列

   

   消息隊列時內核空間中的內部鏈錶，通過內核在各個進程間傳遞內容。消息順序地發送到消息隊列中，並以幾種不同的方式從隊列中獲取，每個隊列通過IPC標識符唯一地標識，每個消息隊列中的消息，又構成一個獨立的鏈錶。

   每个消息队列都有一个队列头，用结构struct msg_queue来描述。队列头中包含了该消息队列的大量信息，包括消息队列键值、用户ID、组ID、消息队列中消息数目等等，甚至记录了最近对消息队列读写进程的ID。读者可以访问这些信息，也可以设置其中的某些信息。

   • 消息緩衝區結構

     #include <linux/msg.h>
     struct msgmbuf { long mtype; //消息類型，用整數表示，可以為某類消息設定一個類型，以區分接收到的不同的消息 char mtext[1]; //消息數據，長度不一定為1 } 

     对于发送消息来说，首先预置一个msgbuf缓冲区并写入消息类型和内容，调用相应的发送函数即可；对读取消息来说，首先分配这样一个msgbuf缓冲区，然后把消息读入该缓冲区即可。

     消息總的大小不能超過8192字節。

   • ipc_perm

     內核將IPC對象的許可權限信息放在ipc_perm類型的結構中。

     struct ipc_perm {
         key_t key; //用於區分消息隊列 uid_t uid; //用戶的UID gid_t gid; //用戶組的id uid_t cuid; //建立者的UID gid_t cgid; unsigned short mode; //讀寫控制權限 unsigned short seq; //序列號 }; 

   • msqid_ds

     消息队列的信息基本上都保存在消息队列头中，因此，可以分配一个类似于消息队列头的结构(struct msqid_ds)，来返回消息队列的属性；同样可以设置该数据结构。

     每個msqid_ds代表一個系統消息隊列。系統通過struct list_head q_messages來管理消息隊列，一個系統中最優有128個消息隊列。