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hash_method.c
Package: mysql-4.1.16-win-src.zip　[view]
Upload User: romrleung
Upload Date: 2022-05-23
Package Size: 18897k
Code Size: 2k
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MySQL

Development Platform:

Visual C++

hash_method.c：Code Content
  1. /*-
  2.  * See the file LICENSE for redistribution information.
  3.  *
  4.  * Copyright (c) 1999-2002
  5.  * Sleepycat Software.  All rights reserved.
  6.  */
  8. #include "db_config.h"
  10. #ifndef lint
  11. static const char revid[] = "$Id: hash_method.c,v 11.12 2002/03/27 04:32:12 bostic Exp $";
  12. #endif /* not lint */
  14. #ifndef NO_SYSTEM_INCLUDES
  15. #include <sys/types.h>
  16. #endif
  18. #include "db_int.h"
  19. #include "dbinc/db_page.h"
  20. #include "dbinc/hash.h"
  22. static int __ham_set_h_ffactor __P((DB *, u_int32_t));
  23. static int __ham_set_h_hash
  24.        __P((DB *, u_int32_t(*)(DB *, const void *, u_int32_t)));
  25. static int __ham_set_h_nelem __P((DB *, u_int32_t));
  27. /*
  28.  * __ham_db_create --
  29.  * Hash specific initialization of the DB structure.
  30.  *
  31.  * PUBLIC: int __ham_db_create __P((DB *));
  32.  */
  33. int
  34. __ham_db_create(dbp)
  35. DB *dbp;
  36. {
  37. HASH *hashp;
  38. int ret;
  40. if ((ret = __os_malloc(dbp->dbenv,
  41.     sizeof(HASH), &dbp->h_internal)) != 0)
  42. return (ret);
  44. hashp = dbp->h_internal;
  46. hashp->h_nelem = 0; /* Defaults. */
  47. hashp->h_ffactor = 0;
  48. hashp->h_hash = NULL;
  50. dbp->set_h_ffactor = __ham_set_h_ffactor;
  51. dbp->set_h_hash = __ham_set_h_hash;
  52. dbp->set_h_nelem = __ham_set_h_nelem;
  54. return (0);
  55. }
  57. /*
  58.  * PUBLIC: int __ham_db_close __P((DB *));
  59.  */
  60. int
  61. __ham_db_close(dbp)
  62. DB *dbp;
  63. {
  64. if (dbp->h_internal == NULL)
  65. return (0);
  66. __os_free(dbp->dbenv, dbp->h_internal);
  67. dbp->h_internal = NULL;
  68. return (0);
  69. }
  71. /*
  72.  * __ham_set_h_ffactor --
  73.  * Set the fill factor.
  74.  */
  75. static int
  76. __ham_set_h_ffactor(dbp, h_ffactor)
  77. DB *dbp;
  78. u_int32_t h_ffactor;
  79. {
  80. HASH *hashp;
  82. DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_ffactor");
  83. DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
  85. hashp = dbp->h_internal;
  86. hashp->h_ffactor = h_ffactor;
  87. return (0);
  88. }
  90. /*
  91.  * __ham_set_h_hash --
  92.  * Set the hash function.
  93.  */
  94. static int
  95. __ham_set_h_hash(dbp, func)
  96. DB *dbp;
  97. u_int32_t (*func) __P((DB *, const void *, u_int32_t));
  98. {
  99. HASH *hashp;
  101. DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_hash");
  102. DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
  104. hashp = dbp->h_internal;
  105. hashp->h_hash = func;
  106. return (0);
  107. }
  109. /*
  110.  * __ham_set_h_nelem --
  111.  * Set the table size.
  112.  */
  113. static int
  114. __ham_set_h_nelem(dbp, h_nelem)
  115. DB *dbp;
  116. u_int32_t h_nelem;
  117. {
  118. HASH *hashp;
  120. DB_ILLEGAL_AFTER_OPEN(dbp, "set_h_nelem");
  121. DB_ILLEGAL_METHOD(dbp, DB_OK_HASH);
  123. hashp = dbp->h_internal;
  124. hashp->h_nelem = h_nelem;
  125. return (0);
  126. }