int ewah_serialize_to(struct ewah_bitmap *self, int (*write_fun)(void *, const void *, size_t), void *data) { size_t i; eword_t dump[2048]; const size_t words_per_dump = sizeof(dump) / sizeof(eword_t); uint32_t bitsize, word_count, rlw_pos; const eword_t *buffer; size_t words_left; /* 32 bit -- bit size for the map */ bitsize = htonl((uint32_t)self->bit_size); if (write_fun(data, &bitsize, 4) != 4) return -1; /** 32 bit -- number of compressed 64-bit words */ word_count = htonl((uint32_t)self->buffer_size); if (write_fun(data, &word_count, 4) != 4) return -1; /** 64 bit x N -- compressed words */ buffer = self->buffer; words_left = self->buffer_size; while (words_left >= words_per_dump) { for (i = 0; i < words_per_dump; ++i, ++buffer) dump[i] = htonll(*buffer); if (write_fun(data, dump, sizeof(dump)) != sizeof(dump)) return -1; words_left -= words_per_dump; } if (words_left) { for (i = 0; i < words_left; ++i, ++buffer) dump[i] = htonll(*buffer); if (write_fun(data, dump, words_left * 8) != words_left * 8) return -1; } /** 32 bit -- position for the RLW */ rlw_pos = (uint8_t*)self->rlw - (uint8_t *)self->buffer; rlw_pos = htonl(rlw_pos / sizeof(eword_t)); if (write_fun(data, &rlw_pos, 4) != 4) return -1; return (3 * 4) + (self->buffer_size * 8); }
int *writer(void *ID) { int ThID = *(int*)ID; /* When ThID is equal to WRITE_NUM/2, sleep 2 second and let reader read the data */ if (ThID >= WRITE_NUM/2) sleep(2); if (-1 == sem_wait(&w_lock)) { perror("sem_wait didn't return success \n"); pthread_exit((void *)1); } write_fun(ThID); if (-1 == sem_post(&w_lock)) { perror("sem_post didn't return success \n"); pthread_exit((void *)1); } printf("Writer Thread [%d] exit...\n", ThID); pthread_exit((void *)0); }