Win32Process1.c 1/27/2007 /** * Win32Process1.c * Code for Win32Process1.exe * * This is the code for the child process Win32Process1 which will be * created by parent process Win32MulProc * * Author: Joydip Datta * Date: 3:09 PM Saturday, January 27, 2007 */ #include stdio.h #include stdlib.h #include windows.h // a simple process thats counts 1 2 3 4 etc until Esc is hit // a specific delay is imposed between each count #define DEFAULT_DELAY 500 //ms int main(int argc, char * argv[]) { int delay, i, ch; printf("\nProcess Win32Process1 started...\n"); if(argc>=2) //delay specified delay = atoi(argv[1]); else //delay not specified delay = DEFAULT_DELAY; for(i=0;;i++) { if(kbhit()) if((ch=getch())==27) break; printf("Win32Process1: %d\n",i); Sleep(delay); } printf("\nProcess Win32Process1 ended...\n"); Win32Process2.c 1/27/2007 /** * Win32Process2.c * Code for Win32Process2.exe * * This is the code for the child process Win32Process2 which will be * created by parent process Win32MulProc * * Author: Joydip Datta * Date: 3:09 PM Saturday, January 27, 2007 */ #include stdio.h #include stdlib.h #include windows.h // a simple process thats counts 1 2 3 4 etc until Esc is hit // a specific delay is imposed between each count #define DEFAULT_DELAY 500 //ms int main(int argc, char * argv[]) { int delay, i, ch; printf("\nProcess Win32Process2 started...\n"); if(argc>=2) //delay specified delay = atoi(argv[1]); else //delay not specified delay = DEFAULT_DELAY; for(i=0;;i++) { if(kbhit()) if((ch=getch())==27) break; printf("Win32Process2: %d\n",i); Sleep(delay); } printf("\nProcess Win32Process2 ended...\n"); } /** * Win32MulProc.c * This is the parent process that calls and run two child processes * Win32Process1.exe and Win32Process2.exe * (and of course there is the main process) * (To check how Windows handles multi programming) * * Author: Joydip Datta * Date: 3:41 PM Saturday, January 27, 2007 */ #include stdio.h #include windows.h #define DEFAULT_DELAY 500 #define PROCESS1 "Win32Process1" #define PROCESS2 "Win32Process2" int main(int argc, char* argv[]) { STARTUPINFO si1,si2; PROCESS_INFORMATION pi1,pi2; int delayMain,delayP1,delayP2, i, ch; char cmd1[50],cmd2[50]; //commands for two child processes printf("\nProcess Main started...\n"); //delay calculation if(argc>=4) {//delay specified delayMain = atoi(argv[1]); delayP1 = atoi(argv[2]); delayP2 = atoi(argv[3]); } else //delay not specified delayMain = delayP1 = delayP2 = DEFAULT_DELAY; //setup commands sprintf(cmd1,"%s %d",PROCESS1,delayP1); sprintf(cmd2,"%s %d",PROCESS2,delayP2); printf("\nPreparing to open two child processes...\n"); //CREATE 1ST PROCESS //ALLOCATE MEMORY ZeroMemory(&si1,sizeof(si1)); si1.cb=sizeof(si1); ZeroMemory(&pi1,sizeof(pi1)); //create child process if(! CreateProcess(NULL, cmd1, NULL, NULL, FALSE, 0, NULL, NULL, &si1, &pi1)) { fprintf(stderr,"err: Win32Process1 creation failed"); return -1; } //CREATE 2ND PROCESS //ALLOCATE MEMORY ZeroMemory(&si2,sizeof(si2)); si2.cb=sizeof(si2); ZeroMemory(&pi2,sizeof(pi2)); //create child process if(! CreateProcess(NULL, cmd2, NULL, NULL, FALSE, 0, NULL, NULL, &si2, &pi2)) { fprintf(stderr,"err: Win32Process2 creation failed"); return -1; } //loop for main process for(i=0;;i++) { if(kbhit()) if((ch=getch())==27) break; printf("Main: %d\n",i); Sleep(delayMain); } printf("\nLoop of Process Main ended.\nBut Process Main will wait for her children...\n"); //parent will wait till child completes WaitForSingleObject(pi1.hProcess,INFINITE); printf("1st child complete\n"); WaitForSingleObject(pi2.hProcess,INFINITE); printf("2nd child complete\n"); //close handles CloseHandle(pi1.hProcess); CloseHandle(pi1.hThread); printf("\nProcess Main ended...\n"); return 0; | 
