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      1 /**************************************************************************
      2  *
      3  * Copyright 2010 VMware, Inc.  All Rights Reserved.
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining a
      6  * copy of this software and associated documentation files (the
      7  * "Software"), to deal in the Software without restriction, including
      8  * without limitation the rights to use, copy, modify, merge, publish,
      9  * distribute, sub license, and/or sell copies of the Software, and to
     10  * permit persons to whom the Software is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the
     14  * next paragraph) shall be included in all copies or substantial portions
     15  * of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
     18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
     20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
     21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
     22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
     23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     24  *
     25  **************************************************************************/
     26 
     27 
     28 #include "handle.h"
     29 #include "util/u_hash.h"
     30 #include "util/u_hash_table.h"
     31 
     32 
     33 /**
     34  * Hash keys are 32-bit VGHandles
     35  */
     36 
     37 struct util_hash_table *handle_hash = NULL;
     38 
     39 
     40 static unsigned next_handle = 1;
     41 
     42 
     43 static unsigned
     44 hash_func(void *key)
     45 {
     46    /* XXX this kind of ugly */
     47    intptr_t ip = pointer_to_intptr(key);
     48    return (unsigned) (ip & 0xffffffff);
     49 }
     50 
     51 
     52 static int
     53 compare(void *key1, void *key2)
     54 {
     55    if (key1 < key2)
     56       return -1;
     57    else if (key1 > key2)
     58       return +1;
     59    else
     60       return 0;
     61 }
     62 
     63 
     64 void
     65 init_handles(void)
     66 {
     67    if (!handle_hash)
     68       handle_hash = util_hash_table_create(hash_func, compare);
     69 }
     70 
     71 
     72 void
     73 free_handles(void)
     74 {
     75    /* XXX destroy */
     76 }
     77 
     78 
     79 VGHandle
     80 create_handle(void *object)
     81 {
     82    VGHandle h = next_handle++;
     83    util_hash_table_set(handle_hash, intptr_to_pointer(h), object);
     84    return h;
     85 }
     86 
     87 
     88 void
     89 destroy_handle(VGHandle h)
     90 {
     91    util_hash_table_remove(handle_hash, intptr_to_pointer(h));
     92 }
     93 
     94