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annotate nspr/pr/include/prlog.h @ 3:150b72113545

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Add DBM and legacydb support
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:32:02 +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 #ifndef prlog_h___
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7 #define prlog_h___
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8
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9 #include "prtypes.h"
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10
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11 PR_BEGIN_EXTERN_C
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12
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13 /*
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14 ** prlog.h -- Declare interfaces to NSPR's Logging service
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15 **
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16 ** NSPR provides a logging service that is used by NSPR itself and is
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17 ** available to client programs.
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18 **
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19 ** To use the service from a client program, you should create a
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20 ** PRLogModuleInfo structure by calling PR_NewLogModule(). After
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21 ** creating the LogModule, you can write to the log using the PR_LOG()
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22 ** macro.
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23 **
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24 ** Initialization of the log service is handled by NSPR initialization.
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25 **
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26 ** At execution time, you must enable the log service. To enable the
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27 ** log service, set the environment variable: NSPR_LOG_MODULES
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28 ** variable.
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29 **
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30 ** NSPR_LOG_MODULES variable has the form:
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31 **
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32 ** <moduleName>:<value>[, <moduleName>:<value>]*
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33 **
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34 ** Where:
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35 ** <moduleName> is the name passed to PR_NewLogModule().
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36 ** <value> is a numeric constant, e.g. 5. This value is the maximum
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37 ** value of a log event, enumerated by PRLogModuleLevel, that you want
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38 ** written to the log.
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39 **
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40 ** For example: to record all events of greater value than or equal to
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41 ** PR_LOG_ERROR for a LogModule names "gizmo", say:
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42 **
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43 ** set NSPR_LOG_MODULES=gizmo:2
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44 **
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45 ** Note that you must specify the numeric value of PR_LOG_ERROR.
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46 **
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47 ** Special LogModule names are provided for controlling NSPR's log
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48 ** service at execution time. These controls should be set in the
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49 ** NSPR_LOG_MODULES environment variable at execution time to affect
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50 ** NSPR's log service for your application.
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51 **
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52 ** The special LogModule "all" enables all LogModules. To enable all
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53 ** LogModule calls to PR_LOG(), say:
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54 **
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55 ** set NSPR_LOG_MODULES=all:5
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56 **
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57 ** The special LogModule name "sync" tells the NSPR log service to do
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58 ** unbuffered logging.
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59 **
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60 ** The special LogModule name "bufsize:<size>" tells NSPR to set the
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61 ** log buffer to <size>.
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62 **
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63 ** The environment variable NSPR_LOG_FILE specifies the log file to use
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64 ** unless the default of "stderr" is acceptable. For MS Windows
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65 ** systems, NSPR_LOG_FILE can be set to a special value: "WinDebug"
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66 ** (case sensitive). This value causes PR_LOG() output to be written
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67 ** using the Windows API OutputDebugString(). OutputDebugString()
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68 ** writes to the debugger window; some people find this helpful.
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69 **
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70 **
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71 ** To put log messages in your programs, use the PR_LOG macro:
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72 **
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73 ** PR_LOG(<module>, <level>, (<printfString>, <args>*));
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74 **
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75 ** Where <module> is the address of a PRLogModuleInfo structure, and
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76 ** <level> is one of the levels defined by the enumeration:
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77 ** PRLogModuleLevel. <args> is a printf() style of argument list. That
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78 ** is: (fmtstring, ...).
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79 **
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80 ** Example:
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81 **
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82 ** main() {
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83 ** PRIntn one = 1;
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84 ** PRLogModuleInfo * myLm = PR_NewLogModule("gizmo");
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85 ** PR_LOG( myLm, PR_LOG_ALWAYS, ("Log this! %d\n", one));
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86 ** return;
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87 ** }
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88 **
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89 ** Note the use of printf() style arguments as the third agrument(s) to
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90 ** PR_LOG().
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91 **
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92 ** After compiling and linking you application, set the environment:
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93 **
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94 ** set NSPR_LOG_MODULES=gizmo:5
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95 ** set NSPR_LOG_FILE=logfile.txt
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96 **
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97 ** When you execute your application, the string "Log this! 1" will be
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98 ** written to the file "logfile.txt".
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99 **
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100 ** Note to NSPR engineers: a number of PRLogModuleInfo structures are
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101 ** defined and initialized in prinit.c. See this module for ideas on
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102 ** what to log where.
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103 **
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104 */
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105
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106 typedef enum PRLogModuleLevel {
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107 PR_LOG_NONE = 0, /* nothing */
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108 PR_LOG_ALWAYS = 1, /* always printed */
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109 PR_LOG_ERROR = 2, /* error messages */
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110 PR_LOG_WARNING = 3, /* warning messages */
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111 PR_LOG_DEBUG = 4, /* debug messages */
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112
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113 PR_LOG_NOTICE = PR_LOG_DEBUG, /* notice messages */
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114 PR_LOG_WARN = PR_LOG_WARNING, /* warning messages */
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115 PR_LOG_MIN = PR_LOG_DEBUG, /* minimal debugging messages */
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116 PR_LOG_MAX = PR_LOG_DEBUG /* maximal debugging messages */
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117 } PRLogModuleLevel;
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118
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119 /*
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120 ** One of these structures is created for each module that uses logging.
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121 ** "name" is the name of the module
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122 ** "level" is the debugging level selected for that module
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123 */
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124 typedef struct PRLogModuleInfo {
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125 const char *name;
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126 PRLogModuleLevel level;
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127 struct PRLogModuleInfo *next;
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128 } PRLogModuleInfo;
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129
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130 /*
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131 ** Create a new log module.
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132 */
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133 NSPR_API(PRLogModuleInfo*) PR_NewLogModule(const char *name);
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134
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135 /*
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136 ** Set the file to use for logging. Returns PR_FALSE if the file cannot
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137 ** be created
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138 */
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139 NSPR_API(PRBool) PR_SetLogFile(const char *name);
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140
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141 /*
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142 ** Set the size of the logging buffer. If "buffer_size" is zero then the
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143 ** logging becomes "synchronous" (or unbuffered).
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144 */
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145 NSPR_API(void) PR_SetLogBuffering(PRIntn buffer_size);
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146
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147 /*
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148 ** Print a string to the log. "fmt" is a PR_snprintf format type. All
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149 ** messages printed to the log are preceeded by the name of the thread
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150 ** and a time stamp. Also, the routine provides a missing newline if one
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151 ** is not provided.
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152 */
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153 NSPR_API(void) PR_LogPrint(const char *fmt, ...);
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154
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155 /*
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156 ** Flush the log to its file.
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157 */
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158 NSPR_API(void) PR_LogFlush(void);
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159
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160 NSPR_API(void) PR_Assert(const char *s, const char *file, PRIntn ln);
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161
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162 #if defined(DEBUG) || defined(FORCE_PR_LOG)
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163 #define PR_LOGGING 1
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164
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165 #define PR_LOG_TEST(_module,_level) \
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166 ((_module)->level >= (_level))
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167
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168 /*
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169 ** Log something.
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170 ** "module" is the address of a PRLogModuleInfo structure
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171 ** "level" is the desired logging level
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172 ** "args" is a variable length list of arguments to print, in the following
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173 ** format: ("printf style format string", ...)
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174 */
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175 #define PR_LOG(_module,_level,_args) \
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176 PR_BEGIN_MACRO \
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177 if (PR_LOG_TEST(_module,_level)) { \
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178 PR_LogPrint _args; \
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179 } \
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180 PR_END_MACRO
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181
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182 #else /* defined(DEBUG) || defined(FORCE_PR_LOG) */
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183
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184 #undef PR_LOGGING
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185 #define PR_LOG_TEST(module,level) 0
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186 #define PR_LOG(module,level,args)
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187
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188 #endif /* defined(DEBUG) || defined(FORCE_PR_LOG) */
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189
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190 #ifndef NO_NSPR_10_SUPPORT
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191
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192 #ifdef PR_LOGGING
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193 #define PR_LOG_BEGIN PR_LOG
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194 #define PR_LOG_END PR_LOG
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195 #define PR_LOG_DEFINE PR_NewLogModule
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196 #else
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197 #define PR_LOG_BEGIN(module,level,args)
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198 #define PR_LOG_END(module,level,args)
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199 #define PR_LOG_DEFINE(_name) NULL
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200 #endif /* PR_LOGGING */
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201
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202 #endif /* NO_NSPR_10_SUPPORT */
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203
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204 #if defined(DEBUG) || defined(FORCE_PR_ASSERT)
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205
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206 #define PR_ASSERT(_expr) \
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207 ((_expr)?((void)0):PR_Assert(# _expr,__FILE__,__LINE__))
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208
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209 #define PR_NOT_REACHED(_reasonStr) \
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210 PR_Assert(_reasonStr,__FILE__,__LINE__)
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211
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212 #else
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213
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214 #define PR_ASSERT(expr) ((void) 0)
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215 #define PR_NOT_REACHED(reasonStr)
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216
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217 #endif /* defined(DEBUG) || defined(FORCE_PR_ASSERT) */
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218
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219 PR_END_EXTERN_C
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220
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221 #endif /* prlog_h___ */
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