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  1. #include<stdio.h>
  2. int max[100][100];
  3. int alloc[100][100];
  4. int need[100][100];
  5. int avail[100];
  6. int n,r;
  7. void input();
  8. void show();
  9. void cal();
  10. int main()
  11. {
  12. int i,j;
  13. printf("********** Deadlock Detection Algo ************\n");
  14. input();
  15. show();
  16. cal();
  17.  
  18. return 0;
  19. }
  20. void input()
  21. {int i,j;
  22. printf("Enter the no of Processes\t");
  23. scanf("%d",&n);
  24. printf("Enter the no of resource instances\t");
  25. scanf("%d",&r);
  26. printf("Enter the Max Matrix\n");
  27. for(i=0;i<n;i++)
  28. {for(j=0;j<r;j++) {
  29. scanf("%d",&max[i][j]);
  30. }}
  31.  
  32. printf("Enter the Allocation Matrix\n");
  33. for(i=0;i<n;i++)
  34. {for(j=0;j<r;j++) {
  35. scanf("%d",&alloc[i][j]);
  36. }}
  37. printf("Enter the available Resources\n");
  38. for(j=0;j<r;j++) {
  39. scanf("%d",&avail[j]);
  40. }}
  41. void show() {
  42. int i,j;
  43. printf("Process\t Allocation\t Max\t Available\t");
  44. for(i=0;i<n;i++) {
  45. printf("\nP%d\t ",i+1);
  46. for(j=0;j<r;j++) {
  47. printf("%d ",alloc[i][j]); }
  48. printf("\t");
  49. for(j=0;j<r;j++)
  50. {printf("%d ",max[i][j]); }
  51. printf("\t");
  52. if(i==0) {
  53. for(j=0;j<r;j++)
  54. printf("%d ",avail[j]);
  55. }}}
  56.  
  57. void cal()
  58. { int finish[100],temp,need[100][100],flag=1,k,c1=0;
  59. int dead[100];
  60. int safe[100];
  61. int i,j;
  62. for(i=0;i<n;i++)
  63.  
  64. {finish[i]=0;
  65. }
  66. //find need matrix
  67. for(i=0;i<n;i++)
  68. {for(j=0;j<r;j++)
  69. {
  70. need[i][j]=max[i][j]-alloc[i][j];
  71. }}
  72. while(flag)
  73. {flag=0;
  74. for(i=0;i<n;i++)
  75. {int c=0;
  76. for(j=0;j<r;j++)
  77. {if((finish[i]==0)&&(need[i][j]<=avail[j]))
  78. {c++;
  79. if(c==r)
  80. {
  81. for(k=0;k<r;k++)
  82. {avail[k]+=alloc[i][j];
  83. finish[i]=1;
  84. flag=1;
  85. }//printf("\nP%d",i);
  86. if(finish[i]==1)
  87. {i=n;
  88. }}}}}}
  89. j=0;
  90. flag=0;
  91. for(i=0;i<n;i++)
  92. {
  93. if(finish[i]==0)
  94. {dead[j]=i;
  95.  
  96. j++;
  97. flag=1;
  98. }}
  99. if(flag==1)
  100. {
  101. printf("\n\nSystem is in Deadlock and the Deadlock process are\n");
  102. for(i=0;i<n;i++)
  103. {printf("P%d\t",dead[i]);
  104. }}
  105. else
  106. {
  107. printf("\nNo Deadlock Occur"); }}
Success #stdin #stdout 0s 5320KB
comments (?)
stdin
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Standard input is empty
stdout
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********** Deadlock Detection Algo ************
Enter the no of Processes	Enter the no of resource instances	Enter the Max Matrix
Enter the Allocation Matrix
Enter the available Resources
Process	 Allocation	 Max	 Available	
No Deadlock Occur
https://ideone.com/0mXC1r
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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