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Diffstat (limited to 'tests/drmsl.c')
| -rw-r--r-- | tests/drmsl.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/tests/drmsl.c b/tests/drmsl.c new file mode 100644 index 0000000..d1b59a8 --- /dev/null +++ b/tests/drmsl.c @@ -0,0 +1,184 @@ +/* drmsl.c -- Skip list test + * 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> + * + * 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. + * + */ + +#include <stdio.h> +#include <stdlib.h> +#include <sys/time.h> + +#include "xf86drm.h" + +static void print(void* 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) +{ + void *list; + int i, j; + unsigned long keys[1000000]; + unsigned long previous; + unsigned long key; + void *value; + struct timeval start, stop; + double usec; + void *ranstate; + + list = drmSLCreate(); + ranstate = drmRandomCreate(12345); + + for (i = 0; i < size; i++) { + keys[i] = drmRandom(ranstate); + 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); + + drmRandomDouble(ranstate); + drmSLDestroy(list); + + return usec; +} + +static void print_neighbors(void *list, unsigned long key, + unsigned long expected_prev, + unsigned long expected_next) +{ + 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); + if (prev_key != expected_prev) { + fprintf(stderr, "Unexpected neighbor: %5lu. Expected: %5lu\n", + prev_key, expected_prev); + exit(1); + } + if (next_key != expected_next) { + fprintf(stderr, "Unexpected neighbor: %5lu. Expected: %5lu\n", + next_key, expected_next); + exit(1); + } +} + +int main(void) +{ + void* 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, 0, 50); + print_neighbors(list, 50, 0, 50); + print_neighbors(list, 51, 50, 123); + print_neighbors(list, 123, 50, 123); + print_neighbors(list, 200, 123, 213); + print_neighbors(list, 213, 123, 213); + print_neighbors(list, 256, 213, 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; +} |