Mercurial > trustbridge > nss-cmake-static
annotate nspr/pr/include/prmem.h @ 4:b513267f632f tip
Build DBM module
author | Andre Heinecke <andre.heinecke@intevation.de> |
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date | Tue, 05 Aug 2014 18:58:03 +0200 |
parents | 1e5118fa0cb1 |
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rev | line source |
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0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
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2 /* This Source Code Form is subject to the terms of the Mozilla Public |
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this |
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
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5 |
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6 /* |
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7 ** File: prmem.h |
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8 ** Description: API to NSPR memory management functions |
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9 ** |
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10 */ |
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11 #ifndef prmem_h___ |
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12 #define prmem_h___ |
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13 |
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14 #include "prtypes.h" |
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15 #include <stdlib.h> |
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16 |
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17 PR_BEGIN_EXTERN_C |
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18 |
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19 /* |
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20 ** Thread safe memory allocation. |
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21 ** |
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22 ** NOTE: pr wraps up malloc, free, calloc, realloc so they are already |
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23 ** thread safe (and are not declared here - look in stdlib.h). |
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24 */ |
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25 |
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26 /* |
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27 ** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free have the same signatures |
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28 ** as their libc equivalent malloc, calloc, realloc, and free, and have |
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29 ** the same semantics. (Note that the argument type size_t is replaced |
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30 ** by PRUint32.) Memory allocated by PR_Malloc, PR_Calloc, or PR_Realloc |
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31 ** must be freed by PR_Free. |
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32 */ |
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33 |
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34 NSPR_API(void *) PR_Malloc(PRUint32 size); |
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35 |
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36 NSPR_API(void *) PR_Calloc(PRUint32 nelem, PRUint32 elsize); |
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37 |
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38 NSPR_API(void *) PR_Realloc(void *ptr, PRUint32 size); |
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39 |
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40 NSPR_API(void) PR_Free(void *ptr); |
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41 |
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42 /* |
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43 ** The following are some convenience macros defined in terms of |
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44 ** PR_Malloc, PR_Calloc, PR_Realloc, and PR_Free. |
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45 */ |
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46 |
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47 /*********************************************************************** |
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48 ** FUNCTION: PR_MALLOC() |
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49 ** DESCRIPTION: |
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50 ** PR_NEW() allocates an untyped item of size _size from the heap. |
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51 ** INPUTS: _size: size in bytes of item to be allocated |
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52 ** OUTPUTS: untyped pointer to the node allocated |
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53 ** RETURN: pointer to node or error returned from malloc(). |
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54 ***********************************************************************/ |
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55 #define PR_MALLOC(_bytes) (PR_Malloc((_bytes))) |
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56 |
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57 /*********************************************************************** |
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58 ** FUNCTION: PR_NEW() |
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59 ** DESCRIPTION: |
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60 ** PR_NEW() allocates an item of type _struct from the heap. |
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61 ** INPUTS: _struct: a data type |
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62 ** OUTPUTS: pointer to _struct |
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63 ** RETURN: pointer to _struct or error returns from malloc(). |
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64 ***********************************************************************/ |
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65 #define PR_NEW(_struct) ((_struct *) PR_MALLOC(sizeof(_struct))) |
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66 |
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67 /*********************************************************************** |
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68 ** FUNCTION: PR_REALLOC() |
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69 ** DESCRIPTION: |
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70 ** PR_REALLOC() re-allocates _ptr bytes from the heap as a _size |
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71 ** untyped item. |
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72 ** INPUTS: _ptr: pointer to node to reallocate |
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73 ** _size: size of node to allocate |
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74 ** OUTPUTS: pointer to node allocated |
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75 ** RETURN: pointer to node allocated |
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76 ***********************************************************************/ |
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77 #define PR_REALLOC(_ptr, _size) (PR_Realloc((_ptr), (_size))) |
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78 |
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79 /*********************************************************************** |
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80 ** FUNCTION: PR_CALLOC() |
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81 ** DESCRIPTION: |
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82 ** PR_CALLOC() allocates a _size bytes untyped item from the heap |
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83 ** and sets the allocated memory to all 0x00. |
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84 ** INPUTS: _size: size of node to allocate |
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85 ** OUTPUTS: pointer to node allocated |
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86 ** RETURN: pointer to node allocated |
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87 ***********************************************************************/ |
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88 #define PR_CALLOC(_size) (PR_Calloc(1, (_size))) |
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89 |
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90 /*********************************************************************** |
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91 ** FUNCTION: PR_NEWZAP() |
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92 ** DESCRIPTION: |
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93 ** PR_NEWZAP() allocates an item of type _struct from the heap |
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94 ** and sets the allocated memory to all 0x00. |
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95 ** INPUTS: _struct: a data type |
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96 ** OUTPUTS: pointer to _struct |
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97 ** RETURN: pointer to _struct |
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98 ***********************************************************************/ |
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99 #define PR_NEWZAP(_struct) ((_struct*)PR_Calloc(1, sizeof(_struct))) |
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100 |
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101 /*********************************************************************** |
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102 ** FUNCTION: PR_DELETE() |
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103 ** DESCRIPTION: |
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104 ** PR_DELETE() unallocates an object previosly allocated via PR_NEW() |
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105 ** or PR_NEWZAP() to the heap. |
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106 ** INPUTS: pointer to previously allocated object |
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107 ** OUTPUTS: the referenced object is returned to the heap |
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108 ** RETURN: void |
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109 ***********************************************************************/ |
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110 #define PR_DELETE(_ptr) { PR_Free(_ptr); (_ptr) = NULL; } |
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111 |
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112 /*********************************************************************** |
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113 ** FUNCTION: PR_FREEIF() |
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114 ** DESCRIPTION: |
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115 ** PR_FREEIF() conditionally unallocates an object previously allocated |
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116 ** vial PR_NEW() or PR_NEWZAP(). If the pointer to the object is |
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117 ** equal to zero (0), the object is not released. |
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118 ** INPUTS: pointer to previously allocated object |
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119 ** OUTPUTS: the referenced object is conditionally returned to the heap |
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120 ** RETURN: void |
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121 ***********************************************************************/ |
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122 #define PR_FREEIF(_ptr) if (_ptr) PR_DELETE(_ptr) |
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123 |
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124 PR_END_EXTERN_C |
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125 |
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126 #endif /* prmem_h___ */ |