1、捧4計算機與軟件工程學院實驗報告（2017/ 2018學年第1 學期）課程名稱操作系統實驗課程代碼150901189實驗時間2017.11.27指導單位軟件工程系指導教師譚平學生姓名夏霜年級2015 級學 號3120150901209專業計算機科學與技術實驗名稱進程控制實驗地點8321實驗類型驗證實驗學時4一、實驗目的和要求1. 加深對進程概念的理解，進一步認識并發執行的實質2. 掌握Linux操作系統的進程創建和終止操作3. 利用Linux操作系統提供的信號量工具實現進程間的同步4. 掌握對共享內存的相關操作二、實驗環境(實驗設備)硬件：微型計算機軟件：Linux操作系統二、實驗內容及過程1

2、.編寫一段程序，實現進程的軟中斷通信。要求：使用系統調用fork()創建兩個子進程，再用系統調用signal()讓父進程捕捉鍵盤上 來的中斷信號(即按 DEL鍵)；當捕捉到中斷信號后，父進程用系統調用Kill()向兩個子進程發出信號，子進程捕捉到信號后分別輸出下列信息后終止：Child Processll is Killed by Pare nt!Child Processl2 is Killed by Pare nt!父進程等待兩個子進程終止后，輸出如下的信息后終止Pare nt Process is Killed! 在上面的程序中增加語句signal (SIGNAL, SIG-IGN)和

3、signal (SIGQUIT, SIG-IGN),觀察執行結果，并分析原因。解答： 源代碼#in clude#in cludevsig nal.h#in cludev uni std.hvoid wait in g(), stop(), alarmi ng();int wait_mark;void mai n()in t p1, p2 ;if(p1=fork()if(p2=fork() wait mark=1 ;sig nal(SIGINT, stop);sig nal(SIGALRM, alarmi ng); wait in g();kill(p1, 16);kill(p2, 17);wa

4、it(0);wait(0);prin tf(pare nt process is killed! n); exit(0);elsewait_mark=1;sig nal(17, stop);sig nal(SIGINT,SIGGN); while(wait_mark!=O);lockf(1, 1,0);prin tf(childre n process2 is killed by pare ntn); lockf(1,0, 0);exit(0);elsewait_mark=1;sig nal(16, stop);sig nal(SIGINT,SIG_I GN);while(wait_mark!

5、=0);lockf(1, 1,0);prin tf(childre n process1 is killed by pare ntn);lockf(1, 0, 0);exit(0);void wait in g()sleep(5);if(wait_mark!=0)kill(getpid(),SIGALRM);void alarmi ng()wait_mark=O;void stop()wait_mark=O;相關操作界面和運行結果界面截圖不加入 signal (SIGINT, SIG-IGN) 和signal (SIGQUIT, SIG-IGN) 運行結果host 1 f gedtt sign

6、altest.c d gcc signaltest.c -o stgnaltestsignaltestIn functton *natn1:signaltest.c;19:7;Lnplicit declaration of function rwalt* -Winpliclt-functlan-declarationwatt(e);Asign al testc:22:7:-inpli cit declaration of function SxVt WinpHcitfjdction declarationslgnaltKtc:22:7s onstjnattest,c:22:7: slfri a

7、ltest c;34:7; on *exLt*extt(e)；signal test.c:34:7: signalte(t,c:47：5: onexlt(c);extt(O);“yrg： incoRpatible inplicit declaration of built*tn functinot: intlude f*5tdlib*h* h or provide a decla ration of 1 exit * c r - inconpttble implicit declaration of built - tn functinat- include1 or providp a dec

8、laration of 1 exitJ-incompatible inpltcit declaration of built-in functixslccathost 擊 + /signa Ltestcnnoren processl i.s killed by parert children process2 ts killed by parent parent process ts killed!加入 signal (SIGINT, SIG-IGN) 相關操作界面和運行結果界面截圖| xs*5ocalho$t I stgnaltestl.c *t stgrialtestl stgnaltes

9、tlc: In function * main *:slgnaltestl;19: ?; jr n in -j; inpLicit dEclaration of function 1 wait1 -Wlnpliclt -tunctton-decLarattonwatt(6):Aisignaltestlc：22;7: arn lh : impticit declaration of function exit1 -Uinplicit -ru nc t ton -decla ra ttostdltb.hH or protle a declaration or pexttisignaltestl.c

10、:547: rnlng： incoipatible tnplicit declaration of built-in funct ion *erlt*exit(e);signdltst241;34;7;tnclude stdlib*hd or provide a declaration of dexitj xslocalhost TI ./tgraltet2ACparent processts killed!原因：signal(SIGINT,SIG_IGN)是忽略鍵入信號，signal (SIGQUIT, SIG-IGN)是忽略中斷 信號。在子進程中加入 sig nal(SIGINT,SIG_

11、IGN)，子進程會忽略中斷信號，在子進程中加 入sig nal (SIGQUIT, SIG-IGN)，相應的中斷信號就被忽略，只有父進程被中斷2.求100000個浮點數(精確小數點右4位)的平均值(和、最大值、最小值)。要求： 隨機生成100000個浮點數(父進程)； 創建4個子進程，分別求 25000個浮點數之和； 父進程完成100000個浮點數之和并打印結果； 統計順序計算的時間和多個進程采用多道程序設計完成計算的時間。 解答：源代碼#in elude #in elude #in clude #in clude #in clude vuni std.hstatic double allsu

12、m=0.0;int mai n() int i,j;double a425000;double sum4=0.0;double readBuf4; time_t start,e nd;pid_t pid;struct timeval js;int fp42;sra nd(u nsig ned)time(NULL); for(i=0;i4;i+)for(j=0;j25000;j+) aij=(double)ra nd()/(double)RAND_MAX;gettimeofday(&js,NULL);start=js.tv_usec;for(i=0;i4;i+)if(pipe(fpi)0)pri

13、n tf(pipe error); exit(1); pid=fork();if(pid0)pri ntf(fork error!); exit(1);else if(pid=0)for(j=0;j25000;j+)sumi+=aij;write(fpi1, &sumi,sizeof(double);/ prin tf(sum%d=%fn,i,sumi); exit(1);elseif(!read(fpiO,&readBufi,sizeof(double) exit(1);prin tf(sum%d=%fn,i,readBufi);for(i=0;i4;i+) allsum+=readBufi

14、;prin tf(sum=%fn,allsum); gettimeofday(&js,NULL);en d=js.tv_usec;prin tf(time=%dn,e nd-start);return 0;相關操作界面和運行結果界面截圖等M用祥序垃肯文本編輕著tMlLCDocumentsinclude #1nclud include #inc lude til lib. h#include static dauhle all5un=( Oj ini max1()int i.j;double a42OUt J; double sum 1=(S fi double rcadBuf4; time t

15、 start,end； pid_t pld;struct tiinVdl js; int tpl4j 12;srandr (unsigned) time (ill LL)； for(i-0; J-=4;L+)for (j =13; j2b0ec; j+)a L i J J -(double) rand ()/(daubl RAND I4AX; gettlmeoTday(&J s NUU);sLart=j s *tv uecjfor(i=0;i47i+-)if(pipe(fpliJu)prlrtf ( pipf1 rrrnr ); exit(l);)pid=1c rk();If(pid0) pr

16、lntfCTork error!)； exlt(l):xslocalhost Documents$ gedit test.cxslacalhost Documents$ gcc test.c - o testxslocalhost DocumentsS ./testsum0=12555. 205041sun=12480.645962sum2sum3=3 2507.80316SUnt=50068.S43522tinted G01xsMocalhost Documents $四、實驗小結(包括問題和解決方法、心得體會、意見與建議等)本次實驗在編寫程序時，主要是應掌握創建進程，以及對于進程各個操作。使用 fork()函數創建進程，fork函數在父進程中調用一次，在