/*
 * check_concurrentHash.c
 *
 *  Created on: Oct 15, 2009
 *      Author: sears
 */
/*---
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---*/

#define _GNU_SOURCE
#include "../check_includes.h"

#include <stasis/concurrentHash.h>

#include <stdio.h>
#include <time.h>
#include <limits.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>

#define LOG_NAME   "check_lhtable.log"


#ifdef DBUG_TEST
extern int dbug_choice(int);
#define NUM_OPS 4
#define NUM_ENTRIES 4
#define NUM_THREADS 2
#define THREAD_ENTRIES 2
#define HT_ENTRIES 16
#define myrandom(x) dbug_choice(x)
#else
#define NUM_OPS 10000000
#define NUM_ENTRIES 8192
#define NUM_THREADS 100
#define THREAD_ENTRIES ((NUM_ENTRIES/NUM_THREADS)-1)
#endif

hashtable_t * ht;

void * worker(void * arg) {
  pageid_t *data = (pageid_t *)arg;
  for(int j = 0; j < NUM_OPS/ NUM_THREADS; j++) {
    int op = myrandom(2);

    int i = myrandom(THREAD_ENTRIES);

    pageid_t scratch = data[i];
    if(data[i] < 0) {
      scratch *= -1;
    }
    switch(op) {
    case 0: {
      void * ret;
      if(data[i] < 0) {
        ret = hashtable_insert(ht, scratch, &data[i]);
        assert(ret == NULL);
        data[i] *= -1;
      } else {
        ret = hashtable_remove(ht, scratch);
        assert(ret == &data[i]);
        data[i] *= -1;
      }
    } break;
    case 1: {
      void * ret = hashtable_lookup(ht, scratch);
      if(data[i] < 0) {
        assert(ret == NULL);
      } else {
        assert(ret == &data[i]);
      }
    } break;
    default:
      abort();
    }
  }
  free(data);
  return 0;
}

START_TEST(singleThreadHashTest) {
#ifdef DBUG_TEST
  ht = hashtable_init(HT_ENTRIES);
#else
  ht = hashtable_init((pageid_t)((double)THREAD_ENTRIES * 1.1));
#endif
  pageid_t *data = malloc(sizeof(pageid_t) * THREAD_ENTRIES);

  for(int i = 1; i <= THREAD_ENTRIES; i++) {
    data[i-1] = -1 * (i * NUM_THREADS);
  }
  worker(data);
  hashtable_deinit(ht);
} END_TEST

START_TEST(wraparoundHashTest) {
  unsigned numEntries = NUM_OPS/ NUM_THREADS * 4 + 3;
  unsigned power = 1;
  while ( (1ull << power ) < numEntries ) {
    ++power;
  }
#ifdef DBUG_TEST
  ht = hashtable_init(HT_ENTRIES);
#else
  ht = hashtable_init(numEntries);
#endif
  pageid_t *data = malloc(sizeof(pageid_t) * THREAD_ENTRIES);

  for(int i = 1; i <= THREAD_ENTRIES; i++) {
    data[i-1] = -1 * (((i << power) - 6 + myrandom(13)) / 13);
  }
  worker(data);
  hashtable_deinit(ht);
} END_TEST

START_TEST(concurrentHashTest) {
#ifdef DBUG_TEST
  ht = hashtable_init(HT_ENTRIES);
#else
  ht = hashtable_init((pageid_t)((double)NUM_ENTRIES * 1.1));
#endif
  pthread_t workers[NUM_THREADS];
  for(int i = 0 ; i < NUM_THREADS; i++) {
    pageid_t *data = malloc(sizeof(pageid_t) * THREAD_ENTRIES);

    for(int j = 1; j <= THREAD_ENTRIES; j++) {
      data[j-1] = -1 * (i + (j * NUM_THREADS));
    }
    pthread_create(&workers[i], 0, worker, data);
  }
  for(int i = 0 ; i < NUM_THREADS; i++) {
    pthread_join(workers[i],0);
  }
  hashtable_deinit(ht);
} END_TEST

Suite * check_suite(void) {
  Suite *s = suite_create("lhtable");
  /* Begin a new test */
  TCase *tc = tcase_create("lhtable");

  tcase_set_timeout(tc, 0); // disable timeouts

  srandom(43);

  /* Sub tests are added, one per line, here */
  tcase_add_test(tc, singleThreadHashTest);
#ifndef DBUG_TEST // TODO should run exactly one of these two tests under dbug.  Need good way to choose which one.
  tcase_add_test(tc, wraparoundHashTest);
  tcase_add_test(tc, concurrentHashTest);
#endif

  /* --------------------------------------------- */

  tcase_add_checked_fixture(tc, setup, teardown);


  suite_add_tcase(s, tc);
  return s;
}

#include "../check_setup.h"