Contoh Soal PID Proses
Soal:
Suatu proses induk akan mengirimkan dua bilangan (parameter) kepada dua proses anak. Tiap proses anak akan mengecek apakah bilangan tersebut merupakan bilangan ganjil ataukah bukan. Bila ganjil, maka proses anak akan mengirimkan nilai 1 kepada proses induk. Bila genap, proses anak akan mengirimkan nilai 0 kepada proses induk. Proses induk lalu melakukan pengecekan logika terhadap hasil dari proses anak tersebut. Pengecekan bisa menggunakan “OR” ataupun “AND”. Semua hasil lalu ditampilkan di layar oleh proses induk
Hasinya:
Jawab:
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <stdlib.h>
void child(int InputNumber1, int InputNumber2, int totalpipe)
{
int IntProcess1,IntProcess2,Hasil1,Hasil2,HasilAkhir1,HasilAkhir2;
int pipex[4][2],i;
FILE *FileInput[100],*FileOutput[100];
pid_t pid[100];
i=0;
while(i<totalpipe)
{
pipe(pipex[i]);
i++;
}
FileInput[1] = fdopen(pipex[0][1],”w”);
fprintf(FileInput[1],”%d\n”,InputNumber1);
fclose(FileInput[1]);
FileInput[2] = fdopen(pipex[2][1],”w”);
fprintf(FileInput[2],”%d\n”,InputNumber2);
fclose(FileInput[2]); pid[1] = fork();
if(pid[1]==-1)
{
exit(EXIT_FAILURE);
}
else if(pid[1]==0)
{
close(pipex[0][1]);
FileInput[1] = fdopen(pipex[0][0],”r”);
fscanf(FileInput[1],”%d”,&IntProcess1);
fclose(FileInput[1]);
Hasil1 = IntProcess1%2;
printf(”Anak Pertama Mengirimkan : %d\n”,Hasil1);
FileOutput[1] = fdopen(pipex[1][0],”w”);
fprintf(FileOutput[1],”%d\n”,Hasil1);
fclose(FileOutput[1]);
}
else
{
pid[2] = fork();
if(pid[2]==-1)
{
exit(EXIT_FAILURE);
}
else if(pid[2]==0)
{
close(pipex[2][1]);
FileInput[2] = fdopen(pipex[2][0],”r”);
fscanf(FileInput[2],”%d”,&IntProcess2);
fclose(FileInput[2]);
Hasil2 = IntProcess2%2;
printf(”Anak Kedua Mengirimkan : %d\n”,Hasil2);
FileOutput[2] = fdopen(pipex[3][1],”w”);
fprintf(FileOutput[2],”%d\n”,Hasil2);
fclose(FileOutput[2]);
}
else
{
printf(”===================================================\n”);
FileOutput[1] = fdopen(pipex[0][0],”r”);
fscanf(FileOutput[1],”%d”,&HasilAkhir1);
fclose(FileOutput[1]);
FileOutput[2] = fdopen(pipex[3][0],”r”);
fscanf(FileOutput[2],”%d”,&HasilAkhir2);
fclose(FileOutput[2]);
printf(”Hasil dari OR : %d\n”,HasilAkhir1||HasilAkhir2);
printf(”Hasil dari AND : %d\n”,HasilAkhir1&&HasilAkhir2);
exit(EXIT_SUCCESS);
}
}
return;
}
int main ()
{
int InputNumber1,InputNumber2;
printf(”Masukkan angka pertama (#1): “);
scanf(”%d”,&InputNumber1);
printf(”Masukkan angka kedua (#2) : “);
scanf(”%d”,&InputNumber2);
child(InputNumber1,InputNumber2,4);
return 0;
}
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