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#include "my_sys.h"
#include "pthread.h"
#include "time.h"
#include "ring_buffer.hpp"
#include <fstream>
RingBuffer *cache;
uchar *buff_from;
uchar *buff_to;
pthread_barrier_t barrier;
void *read_to_cache(void *) {
pthread_barrier_wait(&barrier);
for (int i= 0; i < 32; ++i) {
cache->read_slot(buff_to + (i * 255), 255);
}
return NULL;
}
void *write_to_cache(void *args) {
struct st_my_thread_var thdvar;
set_mysys_var(&thdvar);
pthread_barrier_wait(&barrier);
int *v_args= (int *) args;
for (int i= v_args[0]; i < v_args[1]; ++i)
cache->write_slot(buff_from + (i * 255), 255);
return NULL;
}
void *write_to_cache_one(void*) {
for (int i= 0; i < 32; ++i)
cache->write_slot(buff_from + (i * 255), 255);
return NULL;
}
int main() {
static const int thread_write_count= 4;
static const int part_of_data_for_writers = 8;
static const int size_buffer = 10000;
clock_t tss, tee;
int args[8];
pthread_t thr_read;
pthread_t *thr_write= (pthread_t *) malloc(8 * sizeof(pthread_t));
buff_to= (uchar *) malloc(sizeof(uchar) * size_buffer);
buff_from = (uchar*) malloc(sizeof(uchar) * size_buffer);
pthread_barrier_init(&barrier, NULL, thread_write_count + 1);
{
std::ofstream off;
off.open("random.txt");
char c;
int r;
srand (0);
for (int i=0; i<8160; i++) {
r = i % 4; // generate a random number
if(r == 3) {
buff_from[i] = '\n';
continue;
}
c = 'a' + rand() % 26; // Convert to a character from a-z
buff_from[i] = c;
}
off << buff_from; // copy generated bytes to file
}
remove("cache_file.txt"); // re-create cache file on each start
tss= clock();
cache= new RingBuffer((char *) "cache_file.txt", 4096);
for (int i= 0; i < thread_write_count; ++i) {
args[i * 2]= i * part_of_data_for_writers;
args[(i * 2) + 1]= (i + 1) * part_of_data_for_writers;
pthread_create(&thr_write[i], NULL, write_to_cache, (void *) &args[i * 2]);
}
pthread_create(&thr_read, NULL, read_to_cache, NULL);
for (int i= 0; i < thread_write_count; ++i)
pthread_join(thr_write[i], NULL);
pthread_join(thr_read, NULL);
delete cache;
tee= clock();
printf("Time: %lld\n", (long long) tee - tss);
std::ofstream of;
of.open("test_out.txt", std::ios_base::out);
of << buff_to;
return 0;
}
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