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| #include <pthread.h>
#include <stdio.h>
/* Parameters to print_function. */
struct char_print_parms
{
/* The character to print. */
double sum;
/* The number of times to print it. */
long count;
};
/* Prints a number of characters to stderr, as given by PARAMETERS,
which is a pointer to a struct char_print_parms. */
void* char_print (void* parameters)
{
/* Cast the cookie pointer to the right type. */
struct char_print_parms* p = (struct char_print_parms*) parameters;
int i;
for (i = 1; i < p->count; i++)
p->sum = p->sum + i;
return NULL;
}
/* The main program. */
int main ()
{
pthread_t thread1_id;
pthread_t thread2_id;
struct char_print_parms thread1_args;
struct char_print_parms thread2_args;
thread1_args.sum = 0.0;
thread1_args.count = 000000000;
pthread_create (&thread1_id, NULL, &char_print, &thread1_args);
thread2_args.sum = 0.0;
thread2_args.count = 200000000;
pthread_create (&thread2_id, NULL, &char_print, &thread2_args);
pthread_join (thread1_id, NULL);
pthread_join (thread2_id, NULL);
fprintf(stderr,"%f \n",thread1_args.sum);
fprintf(stderr,"%f \n",thread2_args.sum);
/* Now we can safely return. */
return 0;
} |
calcul parallèle et thread
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