Mercurial > trustbridge > nss-cmake-static
annotate nspr/pr/include/prtrace.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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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 prtrace_h___ |
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7 #define prtrace_h___ |
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8 /* |
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9 ** prtrace.h -- NSPR's Trace Facility. |
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10 ** |
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11 ** The Trace Facility provides a means to trace application |
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12 ** program events within a process. When implementing an |
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13 ** application program an engineer may insert a "Trace" function |
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14 ** call, passing arguments to be traced. The "Trace" function |
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15 ** combines the user trace data with identifying data and |
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16 ** writes this data in time ordered sequence into a circular |
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17 ** in-memory buffer; when the buffer fills, it wraps. |
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18 ** |
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19 ** Functions are provided to set and/or re-configure the size of |
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20 ** the trace buffer, control what events are recorded in the |
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21 ** buffer, enable and disable tracing based on specific user |
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22 ** supplied data and other control functions. Methods are provided |
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23 ** to record the trace entries in the in-memory trace buffer to |
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24 ** a file. |
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25 ** |
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26 ** Tracing may cause a performance degredation to the application |
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27 ** depending on the number and placement of calls to the tracing |
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28 ** facility. When tracing is compiled in and all tracing is |
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29 ** disabled via the runtime controls, the overhead should be |
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30 ** minimal. ... Famous last words, eh? |
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31 ** |
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32 ** When DEBUG is defined at compile time, the Trace Facility is |
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33 ** compiled as part of NSPR and any application using NSPR's |
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34 ** header files will have tracing compiled in. When DEBUG is not |
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35 ** defined, the Trace Facility is not compiled into NSPR nor |
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36 ** exported in its header files. If the Trace Facility is |
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37 ** desired in a non-debug build, then FORCE_NSPR_TRACE may be |
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38 ** defined at compile time for both the optimized build of NSPR |
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39 ** and the application. NSPR and any application using NSPR's |
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40 ** Trace Facility must be compiled with the same level of trace |
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41 ** conditioning or unresolved references may be realized at link |
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42 ** time. |
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43 ** |
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44 ** For any of the Trace Facility methods that requires a trace |
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45 ** handle as an input argument, the caller must ensure that the |
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46 ** trace handle argument is valid. An invalid trace handle |
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47 ** argument may cause unpredictable results. |
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48 ** |
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49 ** Trace Facility methods are thread-safe and SMP safe. |
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50 ** |
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51 ** Users of the Trace Facility should use the defined macros to |
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52 ** invoke trace methods, not the function calls directly. e.g. |
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53 ** PR_TRACE( h1,0,1,2, ...); not PR_Trace(h1,0,1,2, ...); |
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54 ** |
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55 ** Application designers should be aware of the effects of |
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56 ** debug and optimized build differences when using result of the |
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57 ** Trace Facility macros in expressions. |
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58 ** |
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59 ** See Also: prcountr.h |
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60 ** |
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61 ** /lth. 08-Jun-1998. |
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62 */ |
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63 |
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64 #include "prtypes.h" |
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65 #include "prthread.h" |
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66 #include "prtime.h" |
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67 |
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68 PR_BEGIN_EXTERN_C |
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69 |
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70 /* |
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71 ** Opaque type for the trace handle |
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72 ** ... Don't even think about looking in here. |
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73 ** |
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74 */ |
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75 typedef void * PRTraceHandle; |
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76 |
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77 /* |
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78 ** PRTraceEntry -- A trace entry in the in-memory trace buffer |
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79 ** looks like this. |
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80 ** |
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81 */ |
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82 typedef struct PRTraceEntry |
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83 { |
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84 PRThread *thread; /* The thread creating the trace entry */ |
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85 PRTraceHandle handle; /* PRTraceHandle creating the trace entry */ |
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86 PRTime time; /* Value of PR_Now() at time of trace entry */ |
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87 PRUint32 userData[8]; /* user supplied trace data */ |
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88 } PRTraceEntry; |
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89 |
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90 /* |
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91 ** PRTraceOption -- command operands to |
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92 ** PR_[Set|Get]TraceOption(). See descriptive meanings there. |
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93 ** |
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94 */ |
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95 typedef enum PRTraceOption |
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96 { |
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97 PRTraceBufSize, |
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98 PRTraceEnable, |
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99 PRTraceDisable, |
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100 PRTraceSuspend, |
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101 PRTraceResume, |
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102 PRTraceSuspendRecording, |
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103 PRTraceResumeRecording, |
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104 PRTraceLockHandles, |
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105 PRTraceUnLockHandles, |
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106 PRTraceStopRecording |
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107 } PRTraceOption; |
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108 |
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109 /* ----------------------------------------------------------------------- |
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110 ** FUNCTION: PR_DEFINE_TRACE() -- Define a PRTraceHandle |
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111 ** |
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112 ** DESCRIPTION: PR_DEFINE_TRACE() is used to define a trace |
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113 ** handle. |
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114 ** |
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115 */ |
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116 #define PR_DEFINE_TRACE(name) PRTraceHandle name |
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117 |
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118 /* ----------------------------------------------------------------------- |
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119 ** FUNCTION: PR_INIT_TRACE_HANDLE() -- Set the value of a PRTraceHandle |
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120 ** |
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121 ** DESCRIPTION: |
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122 ** PR_INIT_TRACE_HANDLE() sets the value of a PRTraceHandle |
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123 ** to value. e.g. PR_INIT_TRACE_HANDLE( myHandle, NULL ); |
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124 ** |
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125 */ |
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126 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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127 #define PR_INIT_TRACE_HANDLE(handle,value)\ |
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128 (handle) = (PRCounterHandle)(value) |
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129 #else |
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130 #define PR_INIT_TRACE_HANDLE(handle,value) |
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131 #endif |
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132 |
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133 |
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134 /* ----------------------------------------------------------------------- |
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135 ** FUNCTION: PR_CreateTrace() -- Create a trace handle |
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136 ** |
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137 ** DESCRIPTION: |
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138 ** PR_CreateTrace() creates a new trace handle. Tracing is |
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139 ** enabled for this handle when it is created. The trace handle |
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140 ** is intended for use in other Trace Facility calls. |
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141 ** |
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142 ** PR_CreateTrace() registers the QName, RName and description |
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143 ** data so that this data can be retrieved later. |
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144 ** |
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145 ** INPUTS: |
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146 ** qName: pointer to string. QName for this trace handle. |
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147 ** |
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148 ** rName: pointer to string. RName for this trace handle. |
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149 ** |
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150 ** description: pointer to string. Descriptive data about this |
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151 ** trace handle. |
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152 ** |
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153 ** OUTPUTS: |
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154 ** Creates the trace handle. |
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155 ** Registers the QName and RName with the trace facility. |
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156 ** |
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157 ** RETURNS: |
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158 ** PRTraceHandle |
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159 ** |
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160 ** RESTRICTIONS: |
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161 ** qName is limited to 31 characters. |
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162 ** rName is limited to 31 characters. |
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163 ** description is limited to 255 characters. |
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164 ** |
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165 */ |
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166 #define PRTRACE_NAME_MAX 31 |
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167 #define PRTRACE_DESC_MAX 255 |
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168 |
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169 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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170 #define PR_CREATE_TRACE(handle,qName,rName,description)\ |
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171 (handle) = PR_CreateTrace((qName),(rName),(description)) |
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172 #else |
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173 #define PR_CREATE_TRACE(handle,qName,rName,description) |
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174 #endif |
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175 |
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176 NSPR_API(PRTraceHandle) |
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177 PR_CreateTrace( |
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178 const char *qName, /* QName for this trace handle */ |
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179 const char *rName, /* RName for this trace handle */ |
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180 const char *description /* description for this trace handle */ |
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181 ); |
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182 |
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183 |
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184 /* ----------------------------------------------------------------------- |
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185 ** FUNCTION: PR_DestroyTrace() -- Destroy a trace handle |
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186 ** |
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187 ** DESCRIPTION: |
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188 ** PR_DestroyTrace() removes the referenced trace handle and |
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189 ** associated QName, RName and description data from the Trace |
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190 ** Facility. |
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191 ** |
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192 ** INPUTS: handle. A PRTraceHandle |
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193 ** |
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194 ** OUTPUTS: |
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195 ** The trace handle is unregistered. |
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196 ** The QName, RName and description are removed. |
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197 ** |
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198 ** RETURNS: void |
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199 ** |
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200 ** RESTRICTIONS: |
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201 ** |
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202 */ |
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203 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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204 #define PR_DESTROY_TRACE(handle)\ |
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205 PR_DestroyTrace((handle)) |
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206 #else |
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207 #define PR_DESTROY_TRACE(handle) |
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208 #endif |
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209 |
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210 NSPR_API(void) |
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211 PR_DestroyTrace( |
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212 PRTraceHandle handle /* Handle to be destroyed */ |
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213 ); |
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214 |
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215 |
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216 /* ----------------------------------------------------------------------- |
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217 ** FUNCTION: PR_Trace() -- Make a trace entry in the in-memory trace |
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218 ** |
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219 ** DESCRIPTION: |
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220 ** PR_Trace() makes an entry in the in-memory trace buffer for |
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221 ** the referenced trace handle. The next logically available |
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222 ** PRTraceEntry is used; when the next trace entry would overflow |
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223 ** the trace table, the table wraps. |
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224 ** |
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225 ** PR_Trace() for a specific trace handle may be disabled by |
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226 ** calling PR_SetTraceOption() specifying PRTraceDisable for the |
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227 ** trace handle to be disabled. |
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228 ** |
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229 ** INPUTS: |
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230 ** handle: PRTraceHandle. The trace handle for this trace. |
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231 ** |
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232 ** userData[0..7]: unsigned 32bit integers. user supplied data |
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233 ** that is copied into the PRTraceEntry |
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234 ** |
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235 ** OUTPUTS: |
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236 ** A PRTraceEntry is (conditionally) formatted in the in-memory |
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237 ** trace buffer. |
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238 ** |
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239 ** RETURNS: void. |
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240 ** |
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241 ** RESTRICTIONS: |
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242 ** |
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243 */ |
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244 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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245 #define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7)\ |
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246 PR_Trace((handle),(ud0),(ud1),(ud2),(ud3),(ud4),(ud5),(ud6),(ud7)) |
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247 #else |
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248 #define PR_TRACE(handle,ud0,ud1,ud2,ud3,ud4,ud5,ud6,ud7) |
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249 #endif |
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250 |
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251 NSPR_API(void) |
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252 PR_Trace( |
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253 PRTraceHandle handle, /* use this trace handle */ |
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254 PRUint32 userData0, /* User supplied data word 0 */ |
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255 PRUint32 userData1, /* User supplied data word 1 */ |
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256 PRUint32 userData2, /* User supplied data word 2 */ |
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257 PRUint32 userData3, /* User supplied data word 3 */ |
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258 PRUint32 userData4, /* User supplied data word 4 */ |
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259 PRUint32 userData5, /* User supplied data word 5 */ |
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260 PRUint32 userData6, /* User supplied data word 6 */ |
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261 PRUint32 userData7 /* User supplied data word 7 */ |
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262 ); |
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263 |
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264 /* ----------------------------------------------------------------------- |
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265 ** FUNCTION: PR_SetTraceOption() -- Control the Trace Facility |
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266 ** |
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267 ** DESCRIPTION: |
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268 ** PR_SetTraceOption() controls the Trace Facility. Depending on |
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269 ** command and value, attributes of the Trace Facility may be |
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270 ** changed. |
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271 ** |
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272 ** INPUTS: |
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273 ** command: An enumerated value in the set of PRTraceOption. |
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274 ** value: pointer to the data to be set. Type of the data is |
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275 ** dependent on command; for each value of command, the type |
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276 ** and meaning of dereferenced value is shown. |
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277 ** |
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278 ** PRTraceBufSize: unsigned long: the size of the trace buffer, |
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279 ** in bytes. |
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280 ** |
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281 ** PRTraceEnable: PRTraceHandle. The trace handle to be |
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282 ** enabled. |
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283 ** |
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284 ** PRTraceDisable: PRTraceHandle. The trace handle to be |
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285 ** disabled. |
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286 ** |
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287 ** PRTraceSuspend: void. value must be NULL. All tracing is |
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288 ** suspended. |
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289 ** |
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290 ** PRTraceResume: void. value must be NULL. Tracing for all |
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291 ** previously enabled, prior to a PRTraceSuspend, is resumed. |
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292 ** |
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293 ** PRTraceStopRecording: void. value must be NULL. If recording |
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294 ** (see: ** PR_RecordTraceEntries()) is being done, |
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295 ** PRTraceStopRecording causes PR_RecordTraceEntries() to return |
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296 ** to its caller. If recording is not being done, this function |
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297 ** has no effect. |
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298 ** |
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299 ** PRTraceSuspendRecording: void. Must be NULL. If recording is |
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300 ** being done, PRTraceSuspendRecording causes further writes to |
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301 ** the trace file to be suspended. Data in the in-memory |
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302 ** trace buffer that would ordinarily be written to the |
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303 ** trace file will not be written. Trace entries will continue |
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304 ** to be entered in the in-memory buffer. If the Trace Facility |
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305 ** recording is already in a suspended state, the call has no |
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306 ** effect. |
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307 ** |
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308 ** PRTraceResumeRecording: void. value must be NULL. If |
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309 ** recording for the Trace Facility has been previously been |
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310 ** suspended, this causes recording to resume. Recording resumes |
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311 ** with the next in-memory buffer segment that would be written |
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312 ** if trace recording had not been suspended. If recording is |
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313 ** not currently suspended, the call has no effect. |
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314 ** |
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315 ** PRTraceLockHandles: void. value must be NULL. Locks the |
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316 ** trace handle lock. While the trace handle lock is held, |
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317 ** calls to PR_CreateTrace() will block until the lock is |
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318 ** released. |
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319 ** |
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320 ** PRTraceUnlockHandles: void. value must be NULL. Unlocks the |
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321 ** trace handle lock. |
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322 ** |
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323 ** OUTPUTS: |
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324 ** The operation of the Trace Facility may be changed. |
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325 ** |
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326 ** RETURNS: void |
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327 ** |
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328 ** RESTRICTIONS: |
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329 ** |
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330 */ |
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331 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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332 #define PR_SET_TRACE_OPTION(command,value)\ |
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333 PR_SetTraceOption((command),(value)) |
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334 #else |
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335 #define PR_SET_TRACE_OPTION(command,value) |
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336 #endif |
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337 |
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338 NSPR_API(void) |
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339 PR_SetTraceOption( |
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340 PRTraceOption command, /* One of the enumerated values */ |
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341 void *value /* command value or NULL */ |
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342 ); |
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343 |
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344 |
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345 /* ----------------------------------------------------------------------- |
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346 ** FUNCTION: PR_GetTraceOption() -- Retrieve settings from the Trace Facility |
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347 ** |
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348 ** DESCRIPTION: |
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349 ** PR_GetTraceOption() retrieves the current setting of the |
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350 ** Trace Facility control depending on command. |
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351 ** |
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352 ** |
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353 ** PRTraceBufSize: unsigned long: the size of the trace buffer, |
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354 ** in bytes. |
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355 ** |
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356 ** |
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357 ** INPUTS: |
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358 ** command: one of the enumerated values in PRTraceOptions |
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359 ** valid for PR_GetTraceOption(). |
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360 ** |
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361 ** OUTPUTS: |
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362 ** dependent on command. |
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363 ** |
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364 ** RETURNS: void |
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365 ** |
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366 ** RESTRICTIONS: |
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367 ** |
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368 */ |
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369 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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370 #define PR_GET_TRACE_OPTION(command,value)\ |
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371 PR_GetTraceOption((command),(value)) |
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372 #else |
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373 #define PR_GET_TRACE_OPTION(command,value) |
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374 #endif |
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375 |
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376 NSPR_API(void) |
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377 PR_GetTraceOption( |
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378 PRTraceOption command, /* One of the enumerated values */ |
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379 void *value /* command value or NULL */ |
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380 ); |
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381 |
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382 /* ----------------------------------------------------------------------- |
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383 ** FUNCTION: PR_GetTraceHandleFromName() -- Retrieve an existing |
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384 ** handle by name. |
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385 ** |
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386 ** DESCRIPTION: |
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387 ** PR_GetTraceHandleFromName() retreives an existing tracehandle |
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388 ** using the name specified by qName and rName. |
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389 ** |
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390 ** INPUTS: |
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391 ** qName: pointer to string. QName for this trace handle. |
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392 ** |
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393 ** rName: pointer to string. RName for this trace handle. |
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394 ** |
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395 ** |
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396 ** OUTPUTS: returned. |
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397 ** |
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398 ** RETURNS: |
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399 ** PRTraceHandle associated with qName and rName or NULL when |
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400 ** there is no match. |
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401 ** |
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402 ** RESTRICTIONS: |
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403 ** |
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404 */ |
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405 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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406 #define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName)\ |
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407 (handle) = PR_GetTraceHandleFromName((qName),(rName)) |
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408 #else |
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409 #define PR_GET_TRACE_HANDLE_FROM_NAME(handle,qName,rName) |
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410 #endif |
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411 |
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412 NSPR_API(PRTraceHandle) |
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413 PR_GetTraceHandleFromName( |
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414 const char *qName, /* QName search argument */ |
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415 const char *rName /* RName search argument */ |
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416 ); |
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417 |
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418 /* ----------------------------------------------------------------------- |
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419 ** FUNCTION: PR_GetTraceNameFromHandle() -- Retreive trace name |
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420 ** by bandle. |
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421 ** |
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422 ** DESCRIPTION: |
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423 ** PR_GetTraceNameFromHandle() retreives the existing qName, |
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424 ** rName, and description for the referenced trace handle. |
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425 ** |
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426 ** INPUTS: handle: PRTraceHandle. |
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427 ** |
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428 ** OUTPUTS: pointers to the Trace Facility's copy of qName, |
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429 ** rName and description. ... Don't mess with these values. |
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430 ** They're mine. |
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431 ** |
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432 ** RETURNS: void |
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433 ** |
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434 ** RESTRICTIONS: |
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435 ** |
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436 */ |
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437 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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438 #define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description)\ |
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439 PR_GetTraceNameFromHandle((handle),(qName),(rName),(description)) |
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440 #else |
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441 #define PR_GET_TRACE_NAME_FROM_HANDLE(handle,qName,rName,description) |
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442 #endif |
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443 |
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444 NSPR_API(void) |
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445 PR_GetTraceNameFromHandle( |
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446 PRTraceHandle handle, /* handle as search argument */ |
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447 const char **qName, /* pointer to associated QName */ |
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448 const char **rName, /* pointer to associated RName */ |
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449 const char **description /* pointer to associated description */ |
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450 ); |
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451 |
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452 /* ----------------------------------------------------------------------- |
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453 ** FUNCTION: PR_FindNextTraceQname() -- Retrieive a QName handle |
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454 ** iterator. |
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455 ** |
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456 ** DESCRIPTION: |
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457 ** PR_FindNextTraceQname() retreives the first or next trace |
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458 ** QName handle, depending on the value of handle, from the trace |
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459 ** database. The PRTraceHandle returned can be used as an |
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460 ** iterator to traverse the QName handles in the Trace database. |
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461 ** |
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462 ** INPUTS: |
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463 ** handle: When NULL, PR_FindNextQname() returns the first QName |
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464 ** handle. When a handle is a valid PRTraceHandle previously |
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465 ** retreived using PR_FindNextQname() the next QName handle is |
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466 ** retreived. |
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467 ** |
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468 ** OUTPUTS: returned. |
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469 ** |
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470 ** RETURNS: |
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471 ** PRTraceHandle or NULL when there are no trace handles. |
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472 ** |
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473 ** RESTRICTIONS: |
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474 ** Iterating thru the trace handles via FindFirst/FindNext |
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475 ** should be done under protection of the trace handle lock. |
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476 ** See: PR_SetTraceOption( PRLockTraceHandles ). |
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477 ** |
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478 */ |
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479 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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480 #define PR_FIND_NEXT_TRACE_QNAME(next,handle)\ |
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481 (next) = PR_FindNextTraceQname((handle)) |
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482 #else |
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483 #define PR_FIND_NEXT_TRACE_QNAME(next,handle) |
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484 #endif |
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485 |
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486 NSPR_API(PRTraceHandle) |
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487 PR_FindNextTraceQname( |
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488 PRTraceHandle handle |
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489 ); |
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490 |
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491 |
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492 /* ----------------------------------------------------------------------- |
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493 ** FUNCTION: PR_FindNextTraceRname() -- Retrieive an RName handle |
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494 ** iterator. |
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495 ** |
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496 ** DESCRIPTION: |
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497 ** PR_FindNextTraceRname() retreives the first or next trace |
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498 ** RName handle, depending on the value of handle, from the trace |
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499 ** database. The PRTraceHandle returned can be used as an |
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500 ** iterator to traverse the RName handles in the Trace database. |
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501 ** |
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502 ** INPUTS: |
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503 ** rhandle: When NULL, PR_FindNextRname() returns the first |
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504 ** RName handle. When a handle is a valid PRTraceHandle |
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505 ** previously retreived using PR_FindNextRname() the next RName |
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506 ** handle is retreived. |
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507 ** qhandle: A valid PRTraceHandle retruned from a previous call |
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508 ** to PR_FIND_NEXT_TRACE_QNAME(). |
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509 ** |
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510 ** OUTPUTS: returned. |
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511 ** |
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512 ** RETURNS: |
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513 ** PRTraceHandle or NULL when there are no trace handles. |
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514 ** |
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515 ** RESTRICTIONS: |
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516 ** Iterating thru the trace handles via FindNext should be done |
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517 ** under protection of the trace handle lock. See: ( |
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518 ** PR_SetTraceOption( PRLockTraceHandles ). |
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519 ** |
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520 */ |
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521 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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522 #define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle)\ |
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523 (next) = PR_FindNextTraceRname((rhandle),(qhandle)) |
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524 #else |
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525 #define PR_FIND_NEXT_TRACE_RNAME(next,rhandle,qhandle) |
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526 #endif |
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527 |
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528 NSPR_API(PRTraceHandle) |
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529 PR_FindNextTraceRname( |
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530 PRTraceHandle rhandle, |
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531 PRTraceHandle qhandle |
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532 ); |
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533 |
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534 /* ----------------------------------------------------------------------- |
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535 ** FUNCTION: PR_RecordTraceEntries() -- Write trace entries to external media |
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536 ** |
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537 ** DESCRIPTION: |
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538 ** PR_RecordTraceEntries() causes entries in the in-memory trace |
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539 ** buffer to be written to external media. |
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540 ** |
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541 ** When PR_RecordTraceEntries() is called from an application |
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542 ** thread, the function appears to block until another thread |
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543 ** calls PR_SetTraceOption() with the PRTraceStopRecording |
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544 ** option. This suggests that PR_RecordTraceEntries() should be |
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545 ** called from a user supplied thread whose only job is to |
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546 ** record trace entries. |
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547 ** |
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548 ** The environment variable NSPR_TRACE_LOG controls the operation |
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549 ** of this function. When NSPR_TRACE_LOG is not defined in the |
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550 ** environment, no recording of trace entries occurs. When |
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551 ** NSPR_TRACE_LOG is defined, the value of its definition must be |
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552 ** the filename of the file to receive the trace entry buffer. |
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553 ** |
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554 ** PR_RecordTraceEntries() attempts to record the in-memory |
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555 ** buffer to a file, subject to the setting of the environment |
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556 ** variable NSPR_TRACE_LOG. It is possible because of system |
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557 ** load, the thread priority of the recording thread, number of |
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558 ** active trace records being written over time, and other |
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559 ** variables that some trace records can be lost. ... In other |
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560 ** words: don't bet the farm on getting everything. |
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561 ** |
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562 ** INPUTS: none |
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563 ** |
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564 ** OUTPUTS: none |
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565 ** |
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566 ** RETURNS: PR_STATUS |
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567 ** PR_SUCCESS no errors were found. |
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568 ** PR_FAILURE errors were found. |
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569 ** |
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570 ** RESTRICTIONS: |
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571 ** Only one thread can call PR_RecordTraceEntries() within a |
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572 ** process. |
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573 ** |
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574 ** On error, PR_RecordTraceEntries() may return prematurely. |
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575 ** |
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576 */ |
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577 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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578 #define PR_RECORD_TRACE_ENTRIES()\ |
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579 PR_RecordTraceEntries() |
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580 #else |
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581 #define PR_RECORD_TRACE_ENTRIES() |
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582 #endif |
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583 |
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584 NSPR_API(void) |
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585 PR_RecordTraceEntries( |
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586 void |
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587 ); |
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588 |
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589 /* ----------------------------------------------------------------------- |
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590 ** FUNCTION: PR_GetTraceEntries() -- Retreive trace entries from |
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591 ** the Trace Facility |
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592 ** |
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593 ** DESCRIPTION: |
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594 ** PR_GetTraceEntries() retreives trace entries from the Trace |
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595 ** Facility. Up to count trace entries are copied from the Trace |
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596 ** Facility into buffer. Only those trace entries that have not |
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597 ** been copied via a previous call to PR_GetTraceEntries() are |
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598 ** copied. The actual number copied is placed in the PRInt32 |
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599 ** variable pointed to by found. |
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600 ** |
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601 ** If more than count trace entries have entered the Trace |
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602 ** Facility since the last call to PR_GetTraceEntries() |
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603 ** a lost data condition is returned. In this case, the most |
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604 ** recent count trace entries are copied into buffer and found is |
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605 ** set to count. |
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606 ** |
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607 ** INPUTS: |
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608 ** count. The number of trace entries to be copied into buffer. |
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609 ** |
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610 ** |
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611 ** OUTPUTS: |
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612 ** buffer. An array of PRTraceEntries. The buffer is supplied |
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613 ** by the caller. |
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614 ** |
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615 ** found: 32bit signed integer. The number of PRTraceEntries |
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616 ** actually copied. found is always less than or equal to count. |
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617 ** |
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618 ** RETURNS: |
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619 ** zero when there is no lost data. |
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620 ** non-zero when some PRTraceEntries have been lost. |
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621 ** |
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622 ** RESTRICTIONS: |
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623 ** This is a real performance pig. The copy out operation is bad |
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624 ** enough, but depending on then frequency of calls to the |
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625 ** function, serious performance impact to the operating |
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626 ** application may be realized. ... YMMV. |
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627 ** |
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628 */ |
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629 #if defined (DEBUG) || defined (FORCE_NSPR_TRACE) |
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630 #define PR_GET_TRACE_ENTRIES(buffer,count,found)\ |
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631 PR_GetTraceEntries((buffer),(count),(found)) |
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632 #else |
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633 #define PR_GET_TRACE_ENTRIES(buffer,count,found) |
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634 #endif |
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635 |
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636 NSPR_API(PRIntn) |
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637 PR_GetTraceEntries( |
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638 PRTraceEntry *buffer, /* where to write output */ |
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639 PRInt32 count, /* number to get */ |
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640 PRInt32 *found /* number you got */ |
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641 ); |
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642 |
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643 PR_END_EXTERN_C |
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644 |
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645 #endif /* prtrace_h___ */ |
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646 |