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  1. #include <stdlib.h>     /* NULL */
  2. #include <stdio.h>	    /* printf */
  3. #include <sys/types.h>	/* pid_t */
  4. #include <unistd.h>	    /* get_pid */
  5. #include <stdlib.h>     /* exit, EXIT_FAILURE */
  6. #include <sys/wait.h> 	/* wait */
  7. #include <pthread.h>
  8.  
  9. #define PRODUCER_NO 5	//Number of producers, can change here
  10. #define NUM_PRODUCED 20 //2000 //Number of items to be produced, can change here
  11.  
  12. void *generator_function(void*);
  13. void *print_function(void*);
  14. long sum; /* Sum of generated values*/
  15. long finished_producers; /* number of the producer that finished producing */
  16.  
  17. pthread_mutex_t mutex1 = PTHREAD_MUTEX_INITIALIZER;
  18. pthread_cond_t condition_cond = PTHREAD_COND_INITIALIZER;
  19.  
  20. int main(void) {
  21.     int i;
  22.     /* initialize random seed: */
  23.     srand(time(NULL));
  24.     sum = 0;
  25.     finished_producers = 0;
  26.  
  27.     // A: Creates five generator threads
  28.     int thread_return[PRODUCER_NO];
  29.     pthread_t Threads[PRODUCER_NO], Print_Thread;
  30.  
  31.     // Create a thread for the print function
  32.     pthread_create(&Print_Thread, NULL, print_function, NULL);
  33.  
  34.     for (int i = 0; i < PRODUCER_NO; i++) {
  35.         thread_return[i] = pthread_create(&Threads[i], NULL, generator_function, NULL);
  36.     }
  37.  
  38.     // E: Makes sure that print thread has finished before proceeding
  39.     pthread_join(Print_Thread, NULL);
  40.  
  41.     return (0);
  42. }
  43.  
  44. void *generator_function(void* junk) {
  45.     pthread_mutex_lock(&mutex1); // lock
  46.  
  47.     long counter = 0;
  48.     long sum_this_generator = 0;
  49.  
  50.     while (counter < NUM_PRODUCED) {
  51.         long tmpNumber = sum;
  52.         long rnd_number = 1; //rand() % 10; 
  53.         // can make = 1, output should be 100 (20 loops*5 threads)
  54.         printf("current sum of the generated number up to now is %ld going to add %ld to it.\n", tmpNumber, rnd_number);
  55.         sum = tmpNumber + rnd_number;
  56.         counter++;
  57.         sum_this_generator += rnd_number;
  58.         usleep(1000);
  59.     }
  60.  
  61.     printf("--+---+----+----------+---------+---+--+---+------+----\n");
  62.     printf("The sum of produced items for this number generator at the end is: %ld \n", sum_this_generator);
  63.     printf("--+---+----+----------+---------+---+--+---+------+----\n");
  64.     finished_producers++;
  65.     pthread_mutex_unlock(&mutex1); // unlock
  66.  
  67.     // H: If all generator has finished, fire signal for condition variable
  68.     if (finished_producers == PRODUCER_NO) {
  69.         pthread_cond_signal(&condition_cond);
  70.     }
  71.  
  72.     return (0);
  73. }
  74.  
  75. void *print_function(void* junk) {
  76.     pthread_mutex_lock(&mutex1);
  77.  
  78.     // G: Wait until all generator has finished
  79.     while (finished_producers != PRODUCER_NO) {
  80.         pthread_cond_wait(&condition_cond, &mutex1);
  81.     }
  82.  
  83.     printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
  84.     printf("The value of counter at the end is: %ld \n", sum);
  85.     printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
  86.  
  87.     pthread_mutex_unlock(&mutex1);
  88. }
  89.  
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin
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Standard input is empty
stdout
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current sum of the generated number up to now is 0 going to add 1 to it.
current sum of the generated number up to now is 1 going to add 1 to it.
current sum of the generated number up to now is 2 going to add 1 to it.
current sum of the generated number up to now is 3 going to add 1 to it.
current sum of the generated number up to now is 4 going to add 1 to it.
current sum of the generated number up to now is 5 going to add 1 to it.
current sum of the generated number up to now is 6 going to add 1 to it.
current sum of the generated number up to now is 7 going to add 1 to it.
current sum of the generated number up to now is 8 going to add 1 to it.
current sum of the generated number up to now is 9 going to add 1 to it.
current sum of the generated number up to now is 10 going to add 1 to it.
current sum of the generated number up to now is 11 going to add 1 to it.
current sum of the generated number up to now is 12 going to add 1 to it.
current sum of the generated number up to now is 13 going to add 1 to it.
current sum of the generated number up to now is 14 going to add 1 to it.
current sum of the generated number up to now is 15 going to add 1 to it.
current sum of the generated number up to now is 16 going to add 1 to it.
current sum of the generated number up to now is 17 going to add 1 to it.
current sum of the generated number up to now is 18 going to add 1 to it.
current sum of the generated number up to now is 19 going to add 1 to it.
--+---+----+----------+---------+---+--+---+------+----
The sum of produced items for this number generator at the end is: 20 
--+---+----+----------+---------+---+--+---+------+----
current sum of the generated number up to now is 20 going to add 1 to it.
current sum of the generated number up to now is 21 going to add 1 to it.
current sum of the generated number up to now is 22 going to add 1 to it.
current sum of the generated number up to now is 23 going to add 1 to it.
current sum of the generated number up to now is 24 going to add 1 to it.
current sum of the generated number up to now is 25 going to add 1 to it.
current sum of the generated number up to now is 26 going to add 1 to it.
current sum of the generated number up to now is 27 going to add 1 to it.
current sum of the generated number up to now is 28 going to add 1 to it.
current sum of the generated number up to now is 29 going to add 1 to it.
current sum of the generated number up to now is 30 going to add 1 to it.
current sum of the generated number up to now is 31 going to add 1 to it.
current sum of the generated number up to now is 32 going to add 1 to it.
current sum of the generated number up to now is 33 going to add 1 to it.
current sum of the generated number up to now is 34 going to add 1 to it.
current sum of the generated number up to now is 35 going to add 1 to it.
current sum of the generated number up to now is 36 going to add 1 to it.
current sum of the generated number up to now is 37 going to add 1 to it.
current sum of the generated number up to now is 38 going to add 1 to it.
current sum of the generated number up to now is 39 going to add 1 to it.
--+---+----+----------+---------+---+--+---+------+----
The sum of produced items for this number generator at the end is: 20 
--+---+----+----------+---------+---+--+---+------+----
current sum of the generated number up to now is 40 going to add 1 to it.
current sum of the generated number up to now is 41 going to add 1 to it.
current sum of the generated number up to now is 42 going to add 1 to it.
current sum of the generated number up to now is 43 going to add 1 to it.
current sum of the generated number up to now is 44 going to add 1 to it.
current sum of the generated number up to now is 45 going to add 1 to it.
current sum of the generated number up to now is 46 going to add 1 to it.
current sum of the generated number up to now is 47 going to add 1 to it.
current sum of the generated number up to now is 48 going to add 1 to it.
current sum of the generated number up to now is 49 going to add 1 to it.
current sum of the generated number up to now is 50 going to add 1 to it.
current sum of the generated number up to now is 51 going to add 1 to it.
current sum of the generated number up to now is 52 going to add 1 to it.
current sum of the generated number up to now is 53 going to add 1 to it.
current sum of the generated number up to now is 54 going to add 1 to it.
current sum of the generated number up to now is 55 going to add 1 to it.
current sum of the generated number up to now is 56 going to add 1 to it.
current sum of the generated number up to now is 57 going to add 1 to it.
current sum of the generated number up to now is 58 going to add 1 to it.
current sum of the generated number up to now is 59 going to add 1 to it.
--+---+----+----------+---------+---+--+---+------+----
The sum of produced items for this number generator at the end is: 20 
--+---+----+----------+---------+---+--+---+------+----
current sum of the generated number up to now is 60 going to add 1 to it.
current sum of the generated number up to now is 61 going to add 1 to it.
current sum of the generated number up to now is 62 going to add 1 to it.
current sum of the generated number up to now is 63 going to add 1 to it.
current sum of the generated number up to now is 64 going to add 1 to it.
current sum of the generated number up to now is 65 going to add 1 to it.
current sum of the generated number up to now is 66 going to add 1 to it.
current sum of the generated number up to now is 67 going to add 1 to it.
current sum of the generated number up to now is 68 going to add 1 to it.
current sum of the generated number up to now is 69 going to add 1 to it.
current sum of the generated number up to now is 70 going to add 1 to it.
current sum of the generated number up to now is 71 going to add 1 to it.
current sum of the generated number up to now is 72 going to add 1 to it.
current sum of the generated number up to now is 73 going to add 1 to it.
current sum of the generated number up to now is 74 going to add 1 to it.
current sum of the generated number up to now is 75 going to add 1 to it.
current sum of the generated number up to now is 76 going to add 1 to it.
current sum of the generated number up to now is 77 going to add 1 to it.
current sum of the generated number up to now is 78 going to add 1 to it.
current sum of the generated number up to now is 79 going to add 1 to it.
--+---+----+----------+---------+---+--+---+------+----
The sum of produced items for this number generator at the end is: 20 
--+---+----+----------+---------+---+--+---+------+----
current sum of the generated number up to now is 80 going to add 1 to it.
current sum of the generated number up to now is 81 going to add 1 to it.
current sum of the generated number up to now is 82 going to add 1 to it.
current sum of the generated number up to now is 83 going to add 1 to it.
current sum of the generated number up to now is 84 going to add 1 to it.
current sum of the generated number up to now is 85 going to add 1 to it.
current sum of the generated number up to now is 86 going to add 1 to it.
current sum of the generated number up to now is 87 going to add 1 to it.
current sum of the generated number up to now is 88 going to add 1 to it.
current sum of the generated number up to now is 89 going to add 1 to it.
current sum of the generated number up to now is 90 going to add 1 to it.
current sum of the generated number up to now is 91 going to add 1 to it.
current sum of the generated number up to now is 92 going to add 1 to it.
current sum of the generated number up to now is 93 going to add 1 to it.
current sum of the generated number up to now is 94 going to add 1 to it.
current sum of the generated number up to now is 95 going to add 1 to it.
current sum of the generated number up to now is 96 going to add 1 to it.
current sum of the generated number up to now is 97 going to add 1 to it.
current sum of the generated number up to now is 98 going to add 1 to it.
current sum of the generated number up to now is 99 going to add 1 to it.
--+---+----+----------+---------+---+--+---+------+----
The sum of produced items for this number generator at the end is: 20 
--+---+----+----------+---------+---+--+---+------+----
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The value of counter at the end is: 100 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
https://ideone.com/X61Llg
language:
C (gcc 8.3)
created:
145 days ago
visibility:
public

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