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  <TR>
    <TD class=a14>char i; </TD></TR></TBODY></TABLE>
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    <TD class=a14>struct shmid_ds buf; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>key=ftok(" /" , 0); </TD></TR></TBODY></TABLE>
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    <TD class=a14>shmid=shmget(key,SEGSIZE,IPC_CREAT|0604); 
</TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>if(shmid ==－ 1){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>printf(" create shared momery error\n" ); 
</TD></TR></TBODY></TABLE>
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    <TD class=a14>return－ 1; </TD></TR></TBODY></TABLE>
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  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>shm=(char＊ )shmat(shmid,0,0); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>if((int)shm ==－ 1){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>printf(" attach shared momery error\n" ); 
</TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>return－ 1; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>semid=sem(key); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>for(i=0;i&lt;=3;i＋＋ ){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>sleep(1); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>p(semid); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>sleep(READTIME); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>msg[5]=' 0'＋ i; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>memcpy(shm,msg,sizeof(msg)); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>sleep(58); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>v(semid); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>shmdt(shm); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>shmctl(shmid,IPC_RMID,＆ buf); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>d_sem(semid); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>return 0; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>2.Client端程序＃ define SEGSIZE 1024 </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>union semun { </TD></TR></TBODY></TABLE>
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  <TR>
    <TD class=a14>int val; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>struct semid_ds＊ buf; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>ushort_t＊ array; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>} ; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>//打印程序执行时间 </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>void secondpass(){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>static long start=0; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>time_t timer; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>if (start == 0){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>timer=time(NULL); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>start=(long)timer; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
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    <TD class=a14>printf(" now start \n" ); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>printf(" second:％ ld \n" ,(long)(time(NULL))－ start); 
  </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>int sem(key_t key){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>union semun sem ; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>int semid; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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    <TD class=a14>sem.val=0; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>semid=semget(key,0,0); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>if (semid ==－ 1){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>printf(" get semaphore error\n"); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>exit(－ 1); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>return semid; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>//等待信号量变成 0 </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>void waitv(int semid){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>struct sembuf sops={0,0,0}; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>semop(semid,＆ sops,1); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>int main(){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>key_t key; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>int shmid,semid; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>char＊ shm; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>char msg[100]; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>int i; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>key=ftok(" /" , 0); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>shmid=shmget(key,SEGSIZE,0); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>if(shmid ==－ 1){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>printf(" get shared momery error\n" ); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>return－ 1; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>shm=(char＊ )shmat(shmid,0,0); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>if((int)shm ==－ 1){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>printf(" attach shared momery error\n" ); 
</TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>return－ 1; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>semid=sem(key); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>for(i=0;i&lt; 3;i＋＋ ){ </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>sleep(2); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>waitv(semid); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>printf(" the msg get is \n％ s\n" ,shm＋ 1); 
</TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
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  <TR>
    <TD class=a14>secondpass(); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>shmdt(shm); </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>return 0; </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>} </TD></TR></TBODY></TABLE>
<TABLE align=center width=620>
  <TBODY>
  <TR>
    <TD class=a14>本程序在 Solaris 7下编译通过。</TD></TR></TBODY></TABLE><BR>
<TABLE align=center width=620>
  <TBODY>
  <TR>
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