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  1. 	#include <stdlib.h>
  2. 	#include <string.h>
  3. 	#include <stdio.h>
  4. 	#include <pthread.h>
  5.  
  6. 	#define THREADS 5
  7. 	#define DATA 100
  8.  
  9. 	typedef struct _pthread_arg_t {
  10. 		pthread_t thread;
  11. 		int *data;
  12. 		unsigned int end;
  13. 		int max;
  14. 	} pthread_arg_t;
  15.  
  16. 	void* pthread_routine(void *arg) {
  17. 		pthread_arg_t *info = (pthread_arg_t*) arg;
  18. 		int *it = info->data,
  19. 			*end = info->data + info->end;
  20.  
  21. 		while (it < end) {
  22. 			if (*it > info->max) {
  23. 				info->max = *it;
  24. 			}
  25. 			it++;
  26. 		}
  27.  
  28. 		pthread_exit(NULL);
  29. 	}
  30.  
  31. 	int main(int argc, char *argv[]) {
  32. 		pthread_arg_t threads[THREADS];
  33. 		int data[DATA],
  34. 			thread = 0,
  35. 			limit = 0,
  36. 			result = 0;
  37.  
  38. 		memset(&threads, 0, sizeof(pthread_arg_t) * THREADS);	
  39. 		memset(&data, 0, sizeof(int) * DATA);
  40.  
  41. 		while (limit < DATA) {
  42. 			/* you can replace this with randomm number */
  43. 			data[limit] = limit;
  44. 			limit++;
  45. 		}
  46.  
  47. 		limit = DATA/THREADS;
  48.  
  49. 		while (thread < THREADS) {
  50. 			threads[thread].data = &data[thread * limit];
  51. 			threads[thread].end = limit;
  52. 			if (pthread_create(&threads[thread].thread, NULL, pthread_routine, &threads[thread]) != 0) {
  53. 				/* do something */
  54. 				return 1;
  55. 			}
  56. 			thread++;
  57. 		}
  58.  
  59. 		thread = 0;
  60. 		while (thread < THREADS) {
  61. 			if (pthread_join(threads[thread].thread, NULL) != 0) {
  62. 				/* do something */
  63. 				return 1;
  64. 			}
  65. 			thread++;
  66. 		}
  67.  
  68. 		thread = 0;
  69. 		result = threads[0].max;
  70. 		printf("result:\n");
  71. 		while (thread < THREADS) {
  72. 			printf("\t%d - %d: %d\n",
  73. 				thread * limit,
  74. 				thread * limit + limit - 1,
  75. 				threads[thread].max);
  76. 			if (threads[thread].max > result) {
  77. 				result = threads[thread].max;
  78. 			}
  79. 			thread++;
  80. 		}
  81. 		printf("max\t%d\n", result);
  82.  
  83. 		return 0;
  84. 	}
Success #stdin #stdout 0s 44392KB
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Standard input is empty
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result:
	0 - 19: 19
	20 - 39: 39
	40 - 59: 59
	60 - 79: 79
	80 - 99: 99
max	99
https://ideone.com/6CXagu
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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