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/* b01902062 藍挺瑋 */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "xwrap.h"
#include <inttypes.h>
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define SORT_DATA(x) ((SortData*)(x))
typedef struct {
int_least32_t* s;
int start;
int len;
} SortData;
#define MERGE_DATA(x) ((MergeData*)(x))
typedef struct {
int_least32_t* s;
int start;
int mid;
int end;
} MergeData;
static int_least32_t read_32b_integer (FILE* fp) {
int_least32_t n;
switch (fscanf (fp, "%" SCNdLEAST32, &n)) {
case 0:
fputs ("Invalid input!\n", stderr);
exit (3);
case EOF:
fputs ("Why EOF?\n", stderr);
exit (4);
}
return n;
}
static int qsort_cmp_cb (const void* a, const void* b) {
int_least32_t aa = *(int_least32_t*)a;
int_least32_t bb = *(int_least32_t*)b;
if (aa > bb) {
return 1;
} else if (aa == bb) {
return 0;
} else {
return -1;
}
}
static FILE* msg_dev;
static void* task_sort (void* sd_generic) {
SortData* sd = SORT_DATA (sd_generic);
qsort (sd->s + sd->start, sd->len, sizeof (int_least32_t), qsort_cmp_cb);
fprintf (msg_dev, "Sorted %d elements.\n", sd->len);
return NULL;
}
static void* task_merge (void* md_generic) {
MergeData* md = MERGE_DATA (md_generic);
int_least32_t* t = xmalloc (sizeof (int_least32_t) * (md->end - md->start));
int_least32_t* s = md->s;
int i = md->start, iend = md->mid;
int j = md->mid, jend = md->end;
int k = 0;
int_least32_t dup_num = s[i];
int dup_count = 0;
bool is_dup = false;
while (i < iend && j < jend) {
if (s[i] > s[j]) {
t[k] = s[j];
j++, k++;
is_dup = false;
} else if (s[i] < s[j]) {
t[k] = s[i];
i++, k++;
is_dup = false;
} else {
if (!is_dup || dup_num != s[i]) {
dup_count++;
}
dup_num = s[i];
t[k] = s[i];
i++, k++;
t[k] = s[j];
j++, k++;
is_dup = true;
}
}
while (i < iend) {
t[k] = s[i];
i++, k++;
}
while (j < jend) {
t[k] = s[j];
j++, k++;
}
memcpy (s + md->start, t, sizeof (int_least32_t) * (md->end - md->start));
fprintf (msg_dev, "Merged %d and %d elements with %d duplicates.\n",
md->mid - md->start, md->end - md->mid, dup_count);
free (t);
return NULL;
}
int main (int argc, char* argv[]) {
if (argc < 2) {
fprintf (stderr, "Usage: %s segment_size\n", argv[0]);
return 1;
}
char* merger_stderr = getenv ("MERGE_STDERR");
if (merger_stderr == NULL || *merger_stderr == '\0') {
msg_dev = stdout;
} else {
msg_dev = stderr;
}
long ss;
if (xatol (argv[1], &ss) < 0) {
fprintf (stderr, "%s: %s is not an integer\n", argv[0], argv[1]);
return 2;
}
if (ss <= 0) {
fprintf (stderr, "%s: %ld is not a valid segment size\n", argv[0], ss);
return 2;
}
int_least32_t n = read_32b_integer (stdin);
int_least32_t* s = xmalloc (sizeof (int_least32_t) * n);
for (int i = 0; i < n; i++) {
s[i] = read_32b_integer (stdin);
}
int t = n / ss;
int r;
if (t * ss != n) {
t++;
}
pthread_t* tid = xmalloc (sizeof (pthread_t) * t);
/* Sort */
SortData* sd_list = xmalloc (sizeof (SortData) * t);
for (int i = 0, st = 0; i < t; i++, st += ss) {
sd_list[i] = (SortData) {
.s = s,
.start = st,
.len = (st + ss >= n) ? (n - st) : ss
};
r = pthread_create (&tid[i], NULL, task_sort, &sd_list[i]);
if (r != 0) {
perror ("sort: pthread_create");
exit (5);
}
}
for (int i = 0; i < t; i++) {
pthread_join (tid[i], NULL);
}
free (sd_list);
/* Merge */
MergeData* md_list = xmalloc (sizeof (MergeData) * t);
for (long mss = ss; mss < n; mss *= 2) {
t = n / mss;
if (t * mss != n) {
t++;
}
t /= 2;
for (int i = 0, st = 0; i < t; i++, st += mss * 2) {
md_list[i] = (MergeData) {
.s = s,
.start = st,
.mid = st + mss,
.end = (st + mss * 2 > n) ? n : (st + mss * 2)
};
r = pthread_create (&tid[i], NULL, task_merge, &md_list[i]);
if (r != 0) {
perror ("merge: pthread_create");
exit (5);
}
}
for (int i = 0; i < t; i++) {
pthread_join (tid[i], NULL);
}
}
/* Output */
for (int i = 0; i < n; i++) {
if (i) {
putchar (' ');
}
printf ("%" PRIdLEAST32, s[i]);
}
putchar ('\n');
free (s);
free (tid);
free (md_list);
return 0;
}
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