[a0e6c73] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @brief POSIX Keys Manager Initialization |
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| 5 | * @ingroup POSIX_KEY Key |
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| 6 | */ |
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| 7 | |
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[7f72217e] | 8 | /* |
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[b5c9064] | 9 | * Copyright (c) 2012 Zhongwei Yao. |
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[e6c87f7] | 10 | * COPYRIGHT (c) 1989-2014. |
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[b5c9064] | 11 | * On-Line Applications Research Corporation (OAR). |
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[feaa007] | 12 | * |
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[b5c9064] | 13 | * The license and distribution terms for this file may be |
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| 14 | * found in the file LICENSE in this distribution or at |
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[c499856] | 15 | * http://www.rtems.org/license/LICENSE. |
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[5e9b32b] | 16 | */ |
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| 17 | |
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[f42b726] | 18 | #if HAVE_CONFIG_H |
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| 19 | #include "config.h" |
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| 20 | #endif |
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| 21 | |
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[e6c87f7] | 22 | #include <rtems/config.h> |
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| 23 | |
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[2ad250e] | 24 | #include <rtems/posix/keyimpl.h> |
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| 25 | #include <rtems/score/chainimpl.h> |
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[c9b784f] | 26 | #include <rtems/score/objectimpl.h> |
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[5e9b32b] | 27 | #include <rtems/score/wkspace.h> |
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[b5c9064] | 28 | |
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| 29 | /** |
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| 30 | * @brief This routine compares the rbtree node by comparing POSIX key first |
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| 31 | * and comparing thread id second. |
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[309e2f6] | 32 | * |
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[b5c9064] | 33 | * if either of the input nodes's thread_id member is 0, then it will only |
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| 34 | * compare the pthread_key_t member. That is when we pass thread_id = 0 node |
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| 35 | * as a search node, the search is done only by pthread_key_t. |
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[309e2f6] | 36 | * |
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[b5c9064] | 37 | * @param[in] node1 The node to be compared |
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| 38 | * @param[in] node2 The node to be compared |
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| 39 | * @retval positive if first node has higher key than second |
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| 40 | * @retval negative if lower |
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| 41 | * @retval 0 if equal,and for all the thread id is unique, then return 0 is |
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| 42 | * impossible |
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[5e9b32b] | 43 | */ |
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[874297f3] | 44 | |
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[b5c9064] | 45 | int _POSIX_Keys_Key_value_lookup_tree_compare_function( |
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| 46 | const RBTree_Node *node1, |
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| 47 | const RBTree_Node *node2 |
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| 48 | ) |
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| 49 | { |
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| 50 | POSIX_Keys_Key_value_pair *n1; |
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| 51 | POSIX_Keys_Key_value_pair *n2; |
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| 52 | Objects_Id thread_id1, thread_id2; |
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| 53 | int diff; |
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| 54 | |
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| 55 | n1 = _RBTree_Container_of( node1, POSIX_Keys_Key_value_pair, Key_value_lookup_node ); |
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| 56 | n2 = _RBTree_Container_of( node2, POSIX_Keys_Key_value_pair, Key_value_lookup_node ); |
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| 57 | |
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| 58 | diff = n1->key - n2->key; |
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| 59 | if ( diff ) |
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| 60 | return diff; |
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| 61 | |
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| 62 | thread_id1 = n1->thread_id; |
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| 63 | thread_id2 = n2->thread_id; |
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| 64 | |
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| 65 | /** |
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| 66 | * if thread_id1 or thread_id2 equals to 0, only key1 and key2 is valued. |
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| 67 | * it enables us search node only by pthread_key_t type key. |
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| 68 | */ |
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| 69 | if ( thread_id1 && thread_id2 ) |
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| 70 | return thread_id1 - thread_id2; |
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| 71 | return 0; |
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| 72 | } |
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| 73 | |
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[c9b784f] | 74 | static uint32_t _POSIX_Keys_Get_keypool_bump_count( void ) |
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[b5c9064] | 75 | { |
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[e6c87f7] | 76 | uint32_t max = Configuration.maximum_key_value_pairs; |
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[b5c9064] | 77 | |
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[c9b784f] | 78 | return _Objects_Is_unlimited( max ) ? |
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| 79 | _Objects_Maximum_per_allocation( max ) : 0; |
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[b5c9064] | 80 | } |
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| 81 | |
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[c9b784f] | 82 | static uint32_t _POSIX_Keys_Get_initial_keypool_size( void ) |
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[2ad250e] | 83 | { |
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[e6c87f7] | 84 | uint32_t max = Configuration.maximum_key_value_pairs; |
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[2ad250e] | 85 | |
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[c9b784f] | 86 | return _Objects_Maximum_per_allocation( max ); |
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[2ad250e] | 87 | } |
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| 88 | |
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[c9b784f] | 89 | static bool _POSIX_Keys_Keypool_extend( Freechain_Control *keypool ) |
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[b5c9064] | 90 | { |
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[c9b784f] | 91 | size_t bump_count = _POSIX_Keys_Get_keypool_bump_count(); |
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| 92 | bool ok = bump_count > 0; |
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| 93 | |
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| 94 | if ( ok ) { |
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| 95 | size_t size = bump_count * sizeof( POSIX_Keys_Key_value_pair ); |
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| 96 | POSIX_Keys_Key_value_pair *nodes = _Workspace_Allocate( size ); |
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| 97 | |
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| 98 | ok = nodes != NULL; |
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| 99 | |
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| 100 | if ( ok ) { |
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| 101 | _Chain_Initialize( |
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| 102 | &keypool->Freechain, |
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| 103 | nodes, |
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| 104 | bump_count, |
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| 105 | sizeof( *nodes ) |
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| 106 | ); |
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| 107 | } |
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[b5c9064] | 108 | } |
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[c9b784f] | 109 | |
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| 110 | return ok; |
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| 111 | } |
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| 112 | |
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| 113 | static void _POSIX_Keys_Initialize_keypool( void ) |
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| 114 | { |
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[7d1436e] | 115 | Freechain_Control *keypool = &_POSIX_Keys_Keypool; |
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[c9b784f] | 116 | size_t initial_count = _POSIX_Keys_Get_initial_keypool_size(); |
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| 117 | |
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[7d1436e] | 118 | _Freechain_Initialize( keypool, _POSIX_Keys_Keypool_extend ); |
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| 119 | |
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| 120 | if ( initial_count > 0 ) { |
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| 121 | size_t size = initial_count * sizeof( POSIX_Keys_Key_value_pair ); |
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[57c2985] | 122 | POSIX_Keys_Key_value_pair *nodes = |
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| 123 | _Workspace_Allocate_or_fatal_error( size ); |
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[c9b784f] | 124 | |
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[57c2985] | 125 | _Chain_Initialize( |
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| 126 | &keypool->Freechain, |
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| 127 | nodes, |
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| 128 | initial_count, |
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| 129 | sizeof( *nodes ) |
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| 130 | ); |
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| 131 | } |
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[b5c9064] | 132 | } |
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| 133 | |
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| 134 | /** |
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| 135 | * @brief This routine performs the initialization necessary for this manager. |
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| 136 | */ |
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[309e2f6] | 137 | void _POSIX_Key_Manager_initialization(void) |
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[5e9b32b] | 138 | { |
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| 139 | _Objects_Initialize_information( |
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[3c465878] | 140 | &_POSIX_Keys_Information, /* object information table */ |
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| 141 | OBJECTS_POSIX_API, /* object API */ |
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| 142 | OBJECTS_POSIX_KEYS, /* object class */ |
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[e6c87f7] | 143 | Configuration.maximum_keys, |
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[309e2f6] | 144 | /* maximum objects of this class */ |
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[5e9b32b] | 145 | sizeof( POSIX_Keys_Control ), |
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[3c465878] | 146 | /* size of this object's control block */ |
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[b1dbfd7] | 147 | true, /* true if names for this object are strings */ |
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[74d0cb44] | 148 | _POSIX_PATH_MAX /* maximum length of each object's name */ |
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[3c465878] | 149 | #if defined(RTEMS_MULTIPROCESSING) |
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| 150 | , |
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[b1dbfd7] | 151 | false, /* true if this is a global object class */ |
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[3c465878] | 152 | NULL /* Proxy extraction support callout */ |
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| 153 | #endif |
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[5e9b32b] | 154 | ); |
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[b5c9064] | 155 | |
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| 156 | _RBTree_Initialize_empty( |
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| 157 | &_POSIX_Keys_Key_value_lookup_tree, |
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| 158 | _POSIX_Keys_Key_value_lookup_tree_compare_function, |
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| 159 | true |
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| 160 | ); |
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| 161 | |
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[c9b784f] | 162 | _POSIX_Keys_Initialize_keypool(); |
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[5e9b32b] | 163 | } |
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