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annotate nspr/pr/include/prshm.h @ 1:247cffdc9b89

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Add a pesodo config file for inlcude directories and library names
author Andre Heinecke <andre.heinecke@intevation.de>
date Mon, 28 Jul 2014 13:00:06 +0200
parents 1e5118fa0cb1
children
rev   line source
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 ** prshm.h -- NSPR Shared Memory
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8 **
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9 ** NSPR Named Shared Memory API provides a cross-platform named
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10 ** shared-memory interface. NSPR Named Shared Memory is modeled on
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11 ** similar constructs in Unix and Windows operating systems. Shared
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12 ** memory allows multiple processes to access one or more common shared
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13 ** memory regions, using it as an inter-process communication channel.
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14 **
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15 ** Notes on Platform Independence:
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16 ** NSPR Named Shared Memory is built on the native services offered
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17 ** by most platforms. The NSPR Named Shared Memory API tries to
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18 ** provide a least common denominator interface so that it works
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19 ** across all supported platforms. To ensure that it works everywhere,
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20 ** some platform considerations must be accomodated and the protocol
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21 ** for using NSPR Shared Memory API must be observed.
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22 **
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23 ** Protocol:
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24 ** Multiple shared memories can be created using NSPR's Shared Memory
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25 ** feature. For each named shared memory, as defined by the name
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26 ** given in the PR_OpenSharedMemory() call, a protocol for using the
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27 ** shared memory API is required to ensure desired behavior. Failing
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28 ** to follow the protocol may yield unpredictable results.
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29 **
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30 ** PR_OpenSharedMemory() will create the shared memory segment, if it
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31 ** does not already exist, or open a connection that the existing
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32 ** shared memory segment if it already exists.
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33 **
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34 ** PR_AttachSharedMemory() should be called following
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35 ** PR_OpenSharedMemory() to map the memory segment to an address in
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36 ** the application's address space.
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37 **
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38 ** PR_AttachSharedMemory() may be called to re-map a shared memory
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39 ** segment after detaching the same PRSharedMemory object. Be
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40 ** sure to detach it when done.
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41 **
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42 ** PR_DetachSharedMemory() should be called to un-map the shared
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43 ** memory segment from the application's address space.
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44 **
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45 ** PR_CloseSharedMemory() should be called when no further use of the
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46 ** PRSharedMemory object is required within a process. Following a
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47 ** call to PR_CloseSharedMemory() the PRSharedMemory object is
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48 ** invalid and cannot be reused.
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49 **
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50 ** PR_DeleteSharedMemory() should be called before process
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51 ** termination. After calling PR_DeleteSharedMemory() any further use
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52 ** of the shared memory associated with the name may cause
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53 ** unpredictable results.
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54 **
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55 ** Files:
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56 ** The name passed to PR_OpenSharedMemory() should be a valid filename
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57 ** for a unix platform. PR_OpenSharedMemory() creates file using the
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58 ** name passed in. Some platforms may mangle the name before creating
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59 ** the file and the shared memory.
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60 **
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61 ** The unix implementation may use SysV IPC shared memory, Posix
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62 ** shared memory, or memory mapped files; the filename may used to
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63 ** define the namespace. On Windows, the name is significant, but
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64 ** there is no file associated with name.
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65 **
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66 ** No assumptions about the persistence of data in the named file
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67 ** should be made. Depending on platform, the shared memory may be
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68 ** mapped onto system paging space and be discarded at process
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69 ** termination.
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70 **
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71 ** All names provided to PR_OpenSharedMemory() should be valid
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72 ** filename syntax or name syntax for shared memory for the target
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73 ** platform. Referenced directories should have permissions
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74 ** appropriate for writing.
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75 **
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76 ** Limits:
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77 ** Different platforms have limits on both the number and size of
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78 ** shared memory resources. The default system limits on some
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79 ** platforms may be smaller than your requirements. These limits may
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80 ** be adjusted on some platforms either via boot-time options or by
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81 ** setting the size of the system paging space to accomodate more
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82 ** and/or larger shared memory segment(s).
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83 **
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84 ** Security:
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85 ** On unix platforms, depending on implementation, contents of the
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86 ** backing store for the shared memory can be exposed via the file
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87 ** system. Set permissions and or access controls at create and attach
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88 ** time to ensure you get the desired security.
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89 **
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90 ** On windows platforms, no special security measures are provided.
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91 **
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92 ** Example:
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93 ** The test case pr/tests/nameshm1.c provides an example of use as
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94 ** well as testing the operation of NSPR's Named Shared Memory.
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95 **
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96 ** lth. 18-Aug-1999.
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97 */
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98
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99 #ifndef prshm_h___
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100 #define prshm_h___
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101
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102 #include "prtypes.h"
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103 #include "prio.h"
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104
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105 PR_BEGIN_EXTERN_C
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106
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107 /*
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108 ** Declare opaque type PRSharedMemory.
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109 */
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110 typedef struct PRSharedMemory PRSharedMemory;
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111
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112 /*
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113 ** FUNCTION: PR_OpenSharedMemory()
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114 **
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115 ** DESCRIPTION:
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116 ** PR_OpenSharedMemory() creates a new shared-memory segment or
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117 ** associates a previously created memory segment with name.
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118 **
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119 ** When parameter create is (PR_SHM_EXCL | PR_SHM_CREATE) and the
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120 ** shared memory already exists, the function returns NULL with the
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121 ** error set to PR_FILE_EXISTS_ERROR.
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122 **
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123 ** When parameter create is PR_SHM_CREATE and the shared memory
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124 ** already exists, a handle to that memory segment is returned. If
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125 ** the segment does not exist, it is created and a pointer to the
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126 ** related PRSharedMemory structure is returned.
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127 **
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128 ** When parameter create is 0, and the shared memory exists, a
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129 ** pointer to a PRSharedMemory is returned. If the shared memory does
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130 ** not exist, NULL is returned with the error set to
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131 ** PR_FILE_NOT_FOUND_ERROR.
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132 **
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133 ** INPUTS:
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134 ** name -- the name the shared-memory segment is known as.
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135 ** size -- the size of the shared memory segment.
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136 ** flags -- Options for creating the shared memory
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137 ** mode -- Same as is passed to PR_Open()
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138 **
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139 ** OUTPUTS:
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140 ** The shared memory is allocated.
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141 **
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142 ** RETURNS: Pointer to opaque structure PRSharedMemory or NULL.
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143 ** NULL is returned on error. The reason for the error can be
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144 ** retrieved via PR_GetError() and PR_GetOSError();
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145 **
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146 */
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147 NSPR_API( PRSharedMemory * )
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148 PR_OpenSharedMemory(
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149 const char *name,
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150 PRSize size,
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151 PRIntn flags,
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152 PRIntn mode
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153 );
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154 /* Define values for PR_OpenShareMemory(...,create) */
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155 #define PR_SHM_CREATE 0x1 /* create if not exist */
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156 #define PR_SHM_EXCL 0x2 /* fail if already exists */
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157
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158 /*
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159 ** FUNCTION: PR_AttachSharedMemory()
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160 **
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161 ** DESCRIPTION:
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162 ** PR_AttachSharedMemory() maps the shared-memory described by
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163 ** shm to the current process.
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164 **
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165 ** INPUTS:
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166 ** shm -- The handle returned from PR_OpenSharedMemory().
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167 ** flags -- options for mapping the shared memory.
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168 ** PR_SHM_READONLY causes the memory to be attached
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169 ** read-only.
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170 **
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171 ** OUTPUTS:
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172 ** On success, the shared memory segment represented by shm is mapped
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173 ** into the process' address space.
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174 **
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175 ** RETURNS: Address where shared memory is mapped, or NULL.
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176 ** NULL is returned on error. The reason for the error can be
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177 ** retrieved via PR_GetError() and PR_GetOSError();
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178 **
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179 **
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180 */
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181 NSPR_API( void * )
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182 PR_AttachSharedMemory(
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183 PRSharedMemory *shm,
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184 PRIntn flags
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185 );
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186 /* Define values for PR_AttachSharedMemory(...,flags) */
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187 #define PR_SHM_READONLY 0x01
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188
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189 /*
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190 ** FUNCTION: PR_DetachSharedMemory()
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191 **
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192 ** DESCRIPTION:
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193 ** PR_DetachSharedMemory() detaches the shared-memory described
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194 ** by shm.
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195 **
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196 ** INPUTS:
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197 ** shm -- The handle returned from PR_OpenSharedMemory().
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198 ** addr -- The address at which the memory was attached.
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199 **
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200 ** OUTPUTS:
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201 ** The shared memory mapped to an address via a previous call to
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202 ** PR_AttachSharedMemory() is unmapped.
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203 **
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204 ** RETURNS: PRStatus
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205 **
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206 */
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207 NSPR_API( PRStatus )
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208 PR_DetachSharedMemory(
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209 PRSharedMemory *shm,
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210 void *addr
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211 );
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212
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213 /*
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214 ** FUNCTION: PR_CloseSharedMemory()
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215 **
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216 ** DESCRIPTION:
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217 ** PR_CloseSharedMemory() closes the shared-memory described by
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218 ** shm.
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219 **
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220 ** INPUTS:
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221 ** shm -- The handle returned from PR_OpenSharedMemory().
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222 **
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223 ** OUTPUTS:
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224 ** the shared memory represented by shm is closed
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225 **
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226 ** RETURNS: PRStatus
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227 **
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228 */
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229 NSPR_API( PRStatus )
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230 PR_CloseSharedMemory(
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231 PRSharedMemory *shm
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232 );
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233
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234 /*
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235 ** FUNCTION: PR_DeleteSharedMemory()
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236 **
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237 ** DESCRIPTION:
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238 ** The shared memory resource represented by name is released.
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239 **
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240 ** INPUTS:
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241 ** name -- the name the shared-memory segment
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242 **
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243 ** OUTPUTS:
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244 ** depending on platform, resources may be returned to the underlying
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245 ** operating system.
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246 **
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247 ** RETURNS: PRStatus
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248 **
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249 */
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250 NSPR_API( PRStatus )
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251 PR_DeleteSharedMemory(
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252 const char *name
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253 );
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254
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255 PR_END_EXTERN_C
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256
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257 #endif /* prshm_h___ */
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