#include <stdio.h>
#include <stdlib.h>
-#define HASH_MAIN 0
-
-#if !HASH_MAIN
-# include "xf86drm.h"
-#endif
+#include "xf86drm.h"
+#include "xf86drmHash.h"
#define HASH_MAGIC 0xdeadbeef
-#define HASH_DEBUG 0
-#define HASH_SIZE 512 /* Good for about 100 entries */
- /* If you change this value, you probably
- have to change the HashHash hashing
- function! */
-
-#if HASH_MAIN
-#define HASH_ALLOC malloc
-#define HASH_FREE free
-#define HASH_RANDOM_DECL
-#define HASH_RANDOM_INIT(seed) srandom(seed)
-#define HASH_RANDOM random()
-#define HASH_RANDOM_DESTROY
-#else
-#define HASH_ALLOC drmMalloc
-#define HASH_FREE drmFree
-#define HASH_RANDOM_DECL void *state
-#define HASH_RANDOM_INIT(seed) state = drmRandomCreate(seed)
-#define HASH_RANDOM drmRandom(state)
-#define HASH_RANDOM_DESTROY drmRandomDestroy(state)
-
-#endif
-
-typedef struct HashBucket {
- unsigned long key;
- void *value;
- struct HashBucket *next;
-} HashBucket, *HashBucketPtr;
-
-typedef struct HashTable {
- unsigned long magic;
- unsigned long entries;
- unsigned long hits; /* At top of linked list */
- unsigned long partials; /* Not at top of linked list */
- unsigned long misses; /* Not in table */
- HashBucketPtr buckets[HASH_SIZE];
- int p0;
- HashBucketPtr p1;
-} HashTable, *HashTablePtr;
-
-#if HASH_MAIN
-extern void *drmHashCreate(void);
-extern int drmHashDestroy(void *t);
-extern int drmHashLookup(void *t, unsigned long key, unsigned long *value);
-extern int drmHashInsert(void *t, unsigned long key, unsigned long value);
-extern int drmHashDelete(void *t, unsigned long key);
-#endif
static unsigned long HashHash(unsigned long key)
{
int i;
if (!init) {
- HASH_RANDOM_DECL;
- HASH_RANDOM_INIT(37);
- for (i = 0; i < 256; i++) scatter[i] = HASH_RANDOM;
- HASH_RANDOM_DESTROY;
+ void *state;
+ state = drmRandomCreate(37);
+ for (i = 0; i < 256; i++) scatter[i] = drmRandom(state);
+ drmRandomDestroy(state);
++init;
}
}
hash %= HASH_SIZE;
-#if HASH_DEBUG
- printf( "Hash(%d) = %d\n", key, hash);
+#if DEBUG
+ printf( "Hash(%lu) = %lu\n", key, hash);
#endif
return hash;
}
HashTablePtr table;
int i;
- table = HASH_ALLOC(sizeof(*table));
+ table = drmMalloc(sizeof(*table));
if (!table) return NULL;
table->magic = HASH_MAGIC;
table->entries = 0;
for (i = 0; i < HASH_SIZE; i++) {
for (bucket = table->buckets[i]; bucket;) {
next = bucket->next;
- HASH_FREE(bucket);
+ drmFree(bucket);
bucket = next;
}
}
- HASH_FREE(table);
+ drmFree(table);
return 0;
}
if (HashFind(table, key, &hash)) return 1; /* Already in table */
- bucket = HASH_ALLOC(sizeof(*bucket));
+ bucket = drmMalloc(sizeof(*bucket));
if (!bucket) return -1; /* Error */
bucket->key = key;
bucket->value = value;
bucket->next = table->buckets[hash];
table->buckets[hash] = bucket;
-#if HASH_DEBUG
- printf("Inserted %d at %d/%p\n", key, hash, bucket);
+#if DEBUG
+ printf("Inserted %lu at %lu/%p\n", key, hash, bucket);
#endif
return 0; /* Added to table */
}
if (!bucket) return 1; /* Not found */
table->buckets[hash] = bucket->next;
- HASH_FREE(bucket);
+ drmFree(bucket);
return 0;
}
table->p1 = table->buckets[0];
return drmHashNext(table, key, value);
}
-
-#if HASH_MAIN
-#define DIST_LIMIT 10
-static int dist[DIST_LIMIT];
-
-static void clear_dist(void) {
- int i;
-
- for (i = 0; i < DIST_LIMIT; i++) dist[i] = 0;
-}
-
-static int count_entries(HashBucketPtr bucket)
-{
- int count = 0;
-
- for (; bucket; bucket = bucket->next) ++count;
- return count;
-}
-
-static void update_dist(int count)
-{
- if (count >= DIST_LIMIT) ++dist[DIST_LIMIT-1];
- else ++dist[count];
-}
-
-static void compute_dist(HashTablePtr table)
-{
- int i;
- HashBucketPtr bucket;
-
- printf("Entries = %ld, hits = %ld, partials = %ld, misses = %ld\n",
- table->entries, table->hits, table->partials, table->misses);
- clear_dist();
- for (i = 0; i < HASH_SIZE; i++) {
- bucket = table->buckets[i];
- update_dist(count_entries(bucket));
- }
- for (i = 0; i < DIST_LIMIT; i++) {
- if (i != DIST_LIMIT-1) printf("%5d %10d\n", i, dist[i]);
- else printf("other %10d\n", dist[i]);
- }
-}
-
-static void check_table(HashTablePtr table,
- unsigned long key, unsigned long value)
-{
- unsigned long retval = 0;
- int retcode = drmHashLookup(table, key, &retval);
-
- switch (retcode) {
- case -1:
- printf("Bad magic = 0x%08lx:"
- " key = %lu, expected = %lu, returned = %lu\n",
- table->magic, key, value, retval);
- break;
- case 1:
- printf("Not found: key = %lu, expected = %lu returned = %lu\n",
- key, value, retval);
- break;
- case 0:
- if (value != retval)
- printf("Bad value: key = %lu, expected = %lu, returned = %lu\n",
- key, value, retval);
- break;
- default:
- printf("Bad retcode = %d: key = %lu, expected = %lu, returned = %lu\n",
- retcode, key, value, retval);
- break;
- }
-}
-
-int main(void)
-{
- HashTablePtr table;
- int i;
-
- printf("\n***** 256 consecutive integers ****\n");
- table = drmHashCreate();
- for (i = 0; i < 256; i++) drmHashInsert(table, i, i);
- for (i = 0; i < 256; i++) check_table(table, i, i);
- for (i = 256; i >= 0; i--) check_table(table, i, i);
- compute_dist(table);
- drmHashDestroy(table);
-
- printf("\n***** 1024 consecutive integers ****\n");
- table = drmHashCreate();
- for (i = 0; i < 1024; i++) drmHashInsert(table, i, i);
- for (i = 0; i < 1024; i++) check_table(table, i, i);
- for (i = 1024; i >= 0; i--) check_table(table, i, i);
- compute_dist(table);
- drmHashDestroy(table);
-
- printf("\n***** 1024 consecutive page addresses (4k pages) ****\n");
- table = drmHashCreate();
- for (i = 0; i < 1024; i++) drmHashInsert(table, i*4096, i);
- for (i = 0; i < 1024; i++) check_table(table, i*4096, i);
- for (i = 1024; i >= 0; i--) check_table(table, i*4096, i);
- compute_dist(table);
- drmHashDestroy(table);
-
- printf("\n***** 1024 random integers ****\n");
- table = drmHashCreate();
- srandom(0xbeefbeef);
- for (i = 0; i < 1024; i++) drmHashInsert(table, random(), i);
- srandom(0xbeefbeef);
- for (i = 0; i < 1024; i++) check_table(table, random(), i);
- srandom(0xbeefbeef);
- for (i = 0; i < 1024; i++) check_table(table, random(), i);
- compute_dist(table);
- drmHashDestroy(table);
-
- printf("\n***** 5000 random integers ****\n");
- table = drmHashCreate();
- srandom(0xbeefbeef);
- for (i = 0; i < 5000; i++) drmHashInsert(table, random(), i);
- srandom(0xbeefbeef);
- for (i = 0; i < 5000; i++) check_table(table, random(), i);
- srandom(0xbeefbeef);
- for (i = 0; i < 5000; i++) check_table(table, random(), i);
- compute_dist(table);
- drmHashDestroy(table);
-
- return 0;
-}
-#endif
OSDN Git Service
