diff options
Diffstat (limited to 'src/mesa/drivers/dri/dri_client/xf86drmSL.c')
-rw-r--r-- | src/mesa/drivers/dri/dri_client/xf86drmSL.c | 488 |
1 files changed, 0 insertions, 488 deletions
diff --git a/src/mesa/drivers/dri/dri_client/xf86drmSL.c b/src/mesa/drivers/dri/dri_client/xf86drmSL.c deleted file mode 100644 index a9d64c920f..0000000000 --- a/src/mesa/drivers/dri/dri_client/xf86drmSL.c +++ /dev/null @@ -1,488 +0,0 @@ -/* xf86drmSL.c -- Skip list support - * Created: Mon May 10 09:28:13 1999 by faith@precisioninsight.com - * - * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. - * All Rights Reserved. - * - * Permission is hereby granted, free of charge, to any person obtaining a - * copy of this software and associated documentation files (the "Software"), - * to deal in the Software without restriction, including without limitation - * the rights to use, copy, modify, merge, publish, distribute, sublicense, - * and/or sell copies of the Software, and to permit persons to whom the - * Software is furnished to do so, subject to the following conditions: - * - * The above copyright notice and this permission notice (including the next - * paragraph) shall be included in all copies or substantial portions of the - * Software. - * - * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR - * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL - * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR - * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, - * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER - * DEALINGS IN THE SOFTWARE. - * - * Authors: Rickard E. (Rik) Faith <faith@valinux.com> - * - * $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drmSL.c,v 1.3 2000/06/17 00:03:34 martin Exp $ - * - * DESCRIPTION - * - * This file contains a straightforward skip list implementation.n - * - * FUTURE ENHANCEMENTS - * - * REFERENCES - * - * [Pugh90] William Pugh. Skip Lists: A Probabilistic Alternative to - * Balanced Trees. CACM 33(6), June 1990, pp. 668-676. - * - */ - -#define SL_MAIN 0 - -#if SL_MAIN -# include <stdio.h> -# include <stdlib.h> -# include <sys/time.h> -#else -# include "xf86drm.h" -# ifdef XFree86LOADER -# include "xf86.h" -# include "xf86_ansic.h" -# else -# include <stdio.h> -# include <stdlib.h> -# endif -#endif - -#define SL_LIST_MAGIC 0xfacade00LU -#define SL_ENTRY_MAGIC 0x00fab1edLU -#define SL_FREED_MAGIC 0xdecea5edLU -#define SL_MAX_LEVEL 16 -#define SL_DEBUG 0 -#define SL_RANDOM_SEED 0xc01055a1LU - -#if SL_MAIN -#define SL_ALLOC malloc -#define SL_FREE free -#define SL_RANDOM_DECL static int state = 0; -#define SL_RANDOM_INIT(seed) if (!state) { srandom(seed); ++state; } -#define SL_RANDOM random() -#else -#define SL_ALLOC drmMalloc -#define SL_FREE drmFree -#define SL_RANDOM_DECL static void *state = NULL -#define SL_RANDOM_INIT(seed) if (!state) state = drmRandomCreate(seed) -#define SL_RANDOM drmRandom(state) - -#endif - -typedef struct SLEntry { - unsigned long magic; /* SL_ENTRY_MAGIC */ - unsigned long key; - void *value; - int levels; - struct SLEntry *forward[1]; /* variable sized array */ -} SLEntry, *SLEntryPtr; - -typedef struct SkipList { - unsigned long magic; /* SL_LIST_MAGIC */ - int level; - int count; - SLEntryPtr head; - SLEntryPtr p0; /* Position for iteration */ -} SkipList, *SkipListPtr; - -#if SL_MAIN -extern void *drmSLCreate(void); -extern int drmSLDestroy(void *l); -extern int drmSLLookup(void *l, unsigned long key, void **value); -extern int drmSLInsert(void *l, unsigned long key, void *value); -extern int drmSLDelete(void *l, unsigned long key); -extern int drmSLNext(void *l, unsigned long *key, void **value); -extern int drmSLFirst(void *l, unsigned long *key, void **value); -extern void drmSLDump(void *l); -extern int drmSLLookupNeighbors(void *l, unsigned long key, - unsigned long *prev_key, void **prev_value, - unsigned long *next_key, void **next_value); -#endif - -static SLEntryPtr SLCreateEntry(int max_level, unsigned long key, void *value) -{ - SLEntryPtr entry; - - if (max_level < 0 || max_level > SL_MAX_LEVEL) max_level = SL_MAX_LEVEL; - - entry = SL_ALLOC(sizeof(*entry) - + (max_level + 1) * sizeof(entry->forward[0])); - if (!entry) return NULL; - entry->magic = SL_ENTRY_MAGIC; - entry->key = key; - entry->value = value; - entry->levels = max_level + 1; - - return entry; -} - -static int SLRandomLevel(void) -{ - int level = 1; - SL_RANDOM_DECL; - - SL_RANDOM_INIT(SL_RANDOM_SEED); - - while ((SL_RANDOM & 0x01) && level < SL_MAX_LEVEL) ++level; - return level; -} - -void *drmSLCreate(void) -{ - SkipListPtr list; - int i; - - list = SL_ALLOC(sizeof(*list)); - if (!list) return NULL; - list->magic = SL_LIST_MAGIC; - list->level = 0; - list->head = SLCreateEntry(SL_MAX_LEVEL, 0, NULL); - list->count = 0; - - for (i = 0; i <= SL_MAX_LEVEL; i++) list->head->forward[i] = NULL; - - return list; -} - -int drmSLDestroy(void *l) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr entry; - SLEntryPtr next; - - if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ - - for (entry = list->head; entry; entry = next) { - if (entry->magic != SL_ENTRY_MAGIC) return -1; /* Bad magic */ - next = entry->forward[0]; - entry->magic = SL_FREED_MAGIC; - SL_FREE(entry); - } - - list->magic = SL_FREED_MAGIC; - SL_FREE(list); - return 0; -} - -static SLEntryPtr SLLocate(void *l, unsigned long key, SLEntryPtr *update) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr entry; - int i; - - if (list->magic != SL_LIST_MAGIC) return NULL; - - for (i = list->level, entry = list->head; i >= 0; i--) { - while (entry->forward[i] && entry->forward[i]->key < key) - entry = entry->forward[i]; - update[i] = entry; - } - - return entry->forward[0]; -} - -int drmSLInsert(void *l, unsigned long key, void *value) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr entry; - SLEntryPtr update[SL_MAX_LEVEL + 1]; - int level; - int i; - - if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ - - entry = SLLocate(list, key, update); - - if (entry && entry->key == key) return 1; /* Already in list */ - - - level = SLRandomLevel(); - if (level > list->level) { - level = ++list->level; - update[level] = list->head; - } - - entry = SLCreateEntry(level, key, value); - - /* Fix up forward pointers */ - for (i = 0; i <= level; i++) { - entry->forward[i] = update[i]->forward[i]; - update[i]->forward[i] = entry; - } - - ++list->count; - return 0; /* Added to table */ -} - -int drmSLDelete(void *l, unsigned long key) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr update[SL_MAX_LEVEL + 1]; - SLEntryPtr entry; - int i; - - if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ - - entry = SLLocate(list, key, update); - - if (!entry || entry->key != key) return 1; /* Not found */ - - /* Fix up forward pointers */ - for (i = 0; i <= list->level; i++) { - if (update[i]->forward[i] == entry) - update[i]->forward[i] = entry->forward[i]; - } - - entry->magic = SL_FREED_MAGIC; - SL_FREE(entry); - - while (list->level && !list->head->forward[list->level]) --list->level; - --list->count; - return 0; -} - -int drmSLLookup(void *l, unsigned long key, void **value) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr update[SL_MAX_LEVEL + 1]; - SLEntryPtr entry; - - entry = SLLocate(list, key, update); - - if (entry && entry->key == key) { - *value = entry; - return 0; - } - *value = NULL; - return -1; -} - -int drmSLLookupNeighbors(void *l, unsigned long key, - unsigned long *prev_key, void **prev_value, - unsigned long *next_key, void **next_value) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr update[SL_MAX_LEVEL + 1]; - SLEntryPtr entry; - int retcode = 0; - - entry = SLLocate(list, key, update); - - *prev_key = *next_key = key; - *prev_value = *next_value = NULL; - - if (update[0]) { - *prev_key = update[0]->key; - *prev_value = update[0]->value; - ++retcode; - if (update[0]->forward[0]) { - *next_key = update[0]->forward[0]->key; - *next_value = update[0]->forward[0]->value; - ++retcode; - } - } - return retcode; -} - -int drmSLNext(void *l, unsigned long *key, void **value) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr entry; - - if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ - - entry = list->p0; - - if (entry) { - list->p0 = entry->forward[0]; - *key = entry->key; - *value = entry->value; - return 1; - } - list->p0 = NULL; - return 0; -} - -int drmSLFirst(void *l, unsigned long *key, void **value) -{ - SkipListPtr list = (SkipListPtr)l; - - if (list->magic != SL_LIST_MAGIC) return -1; /* Bad magic */ - - list->p0 = list->head->forward[0]; - return drmSLNext(list, key, value); -} - -/* Dump internal data structures for debugging. */ -void drmSLDump(void *l) -{ - SkipListPtr list = (SkipListPtr)l; - SLEntryPtr entry; - int i; - - if (list->magic != SL_LIST_MAGIC) { - printf("Bad magic: 0x%08lx (expected 0x%08lx)\n", - list->magic, SL_LIST_MAGIC); - return; - } - - printf("Level = %d, count = %d\n", list->level, list->count); - for (entry = list->head; entry; entry = entry->forward[0]) { - if (entry->magic != SL_ENTRY_MAGIC) { - printf("Bad magic: 0x%08lx (expected 0x%08lx)\n", - list->magic, SL_ENTRY_MAGIC); - } - printf("\nEntry %p <0x%08lx, %p> has %2d levels\n", - entry, entry->key, entry->value, entry->levels); - for (i = 0; i < entry->levels; i++) { - if (entry->forward[i]) { - printf(" %2d: %p <0x%08lx, %p>\n", - i, - entry->forward[i], - entry->forward[i]->key, - entry->forward[i]->value); - } else { - printf(" %2d: %p\n", i, entry->forward[i]); - } - } - } -} - -#if SL_MAIN -static void print(SkipListPtr list) -{ - unsigned long key; - void *value; - - if (drmSLFirst(list, &key, &value)) { - do { - printf("key = %5lu, value = %p\n", key, value); - } while (drmSLNext(list, &key, &value)); - } -} - -static double do_time(int size, int iter) -{ - SkipListPtr list; - int i, j; - unsigned long keys[1000000]; - unsigned long previous; - unsigned long key; - void *value; - struct timeval start, stop; - double usec; - SL_RANDOM_DECL; - - SL_RANDOM_INIT(12345); - - list = drmSLCreate(); - - for (i = 0; i < size; i++) { - keys[i] = SL_RANDOM; - drmSLInsert(list, keys[i], NULL); - } - - previous = 0; - if (drmSLFirst(list, &key, &value)) { - do { - if (key <= previous) { - printf( "%lu !< %lu\n", previous, key); - } - previous = key; - } while (drmSLNext(list, &key, &value)); - } - - gettimeofday(&start, NULL); - for (j = 0; j < iter; j++) { - for (i = 0; i < size; i++) { - if (drmSLLookup(list, keys[i], &value)) - printf("Error %lu %d\n", keys[i], i); - } - } - gettimeofday(&stop, NULL); - - usec = (double)(stop.tv_sec * 1000000 + stop.tv_usec - - start.tv_sec * 1000000 - start.tv_usec) / (size * iter); - - printf("%0.2f microseconds for list length %d\n", usec, size); - - drmSLDestroy(list); - - return usec; -} - -static void print_neighbors(void *list, unsigned long key) -{ - unsigned long prev_key = 0; - unsigned long next_key = 0; - void *prev_value; - void *next_value; - int retval; - - retval = drmSLLookupNeighbors(list, key, - &prev_key, &prev_value, - &next_key, &next_value); - printf("Neighbors of %5lu: %d %5lu %5lu\n", - key, retval, prev_key, next_key); -} - -int main(void) -{ - SkipListPtr list; - double usec, usec2, usec3, usec4; - - list = drmSLCreate(); - printf( "list at %p\n", list); - - print(list); - printf("\n==============================\n\n"); - - drmSLInsert(list, 123, NULL); - drmSLInsert(list, 213, NULL); - drmSLInsert(list, 50, NULL); - print(list); - printf("\n==============================\n\n"); - - print_neighbors(list, 0); - print_neighbors(list, 50); - print_neighbors(list, 51); - print_neighbors(list, 123); - print_neighbors(list, 200); - print_neighbors(list, 213); - print_neighbors(list, 256); - printf("\n==============================\n\n"); - - drmSLDelete(list, 50); - print(list); - printf("\n==============================\n\n"); - - drmSLDump(list); - drmSLDestroy(list); - printf("\n==============================\n\n"); - - usec = do_time(100, 10000); - usec2 = do_time(1000, 500); - printf("Table size increased by %0.2f, search time increased by %0.2f\n", - 1000.0/100.0, usec2 / usec); - - usec3 = do_time(10000, 50); - printf("Table size increased by %0.2f, search time increased by %0.2f\n", - 10000.0/100.0, usec3 / usec); - - usec4 = do_time(100000, 4); - printf("Table size increased by %0.2f, search time increased by %0.2f\n", - 100000.0/100.0, usec4 / usec); - - return 0; -} -#endif |