FreeCalypso > hg > freecalypso-sw
annotate gsm-fw/nucleus/sms.c @ 197:fa7174faa9aa
fc-tmsh: option to invoke rvinterf "behind the scenes"
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sun, 15 Dec 2013 07:31:52 +0000 |
parents | afceeeb2cba1 |
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rev | line source |
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1 /*************************************************************************/ |
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2 /* */ |
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3 /* Copyright Mentor Graphics Corporation 2002 */ |
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4 /* All Rights Reserved. */ |
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5 /* */ |
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6 /* THIS WORK CONTAINS TRADE SECRET AND PROPRIETARY INFORMATION WHICH IS */ |
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7 /* THE PROPERTY OF MENTOR GRAPHICS CORPORATION OR ITS LICENSORS AND IS */ |
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8 /* SUBJECT TO LICENSE TERMS. */ |
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9 /* */ |
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10 /*************************************************************************/ |
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11 |
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12 /*************************************************************************/ |
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13 /* */ |
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14 /* FILE NAME VERSION */ |
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15 /* */ |
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16 /* sms.c Nucleus PLUS 1.14 */ |
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17 /* */ |
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18 /* COMPONENT */ |
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19 /* */ |
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20 /* SM - Semaphore Management */ |
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21 /* */ |
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22 /* DESCRIPTION */ |
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23 /* */ |
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24 /* This file contains the supplemental routines for the Semaphore */ |
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25 /* Management component. */ |
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26 /* */ |
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27 /* DATA STRUCTURES */ |
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28 /* */ |
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29 /* None */ |
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30 /* */ |
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31 /* FUNCTIONS */ |
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32 /* */ |
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33 /* SMS_Reset_Semaphore Reset semaphore */ |
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34 /* terminate condition */ |
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35 /* */ |
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36 /* DEPENDENCIES */ |
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37 /* */ |
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38 /* cs_extr.h Common Service functions */ |
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39 /* tc_extr.h Thread Control functions */ |
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40 /* sm_extr.h Semaphore functions */ |
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41 /* hi_extr.h History functions */ |
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42 /* */ |
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43 /* HISTORY */ |
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44 /* */ |
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45 /* DATE REMARKS */ |
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46 /* */ |
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47 /* 03-01-1994 Created initial version 1.1 from */ |
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48 /* routines originally in core */ |
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49 /* */ |
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50 /* 03-18-1994 Verified version 1.1 */ |
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51 /* 04-17-1996 updated to version 1.2 */ |
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52 /* 03-24-1998 Released version 1.3. */ |
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53 /* 03-26-1999 Released 1.11m (new release */ |
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54 /* numbering scheme) */ |
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55 /* 04-17-2002 Released version 1.13m */ |
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56 /* 11-07-2002 Released version 1.14 */ |
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57 /*************************************************************************/ |
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58 #define NU_SOURCE_FILE |
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59 |
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60 |
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61 #include "cs_extr.h" /* Common service functions */ |
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62 #include "tc_extr.h" /* Thread control functions */ |
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63 #include "sm_extr.h" /* Semaphore functions */ |
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64 #include "hi_extr.h" /* History functions */ |
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65 #include "profiler.h" /* ProView interface */ |
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66 |
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67 |
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68 |
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69 /*************************************************************************/ |
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70 /* */ |
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71 /* FUNCTION */ |
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72 /* */ |
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73 /* SMS_Reset_Semaphore */ |
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74 /* */ |
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75 /* DESCRIPTION */ |
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76 /* */ |
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77 /* This function resets a semaphore back to the initial state. All */ |
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78 /* tasks suspended on the semaphore are resumed with the reset */ |
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79 /* completion status. */ |
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80 /* */ |
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81 /* CALLED BY */ |
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82 /* */ |
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83 /* Application */ |
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84 /* SMSE_Reset_Semaphore Error checking shell */ |
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85 /* */ |
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86 /* CALLS */ |
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87 /* */ |
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88 /* [HIC_Make_History_Entry] Make entry in history log */ |
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89 /* TCC_Resume_Task Resume a suspended task */ |
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90 /* [TCT_Check_Stack] Stack checking function */ |
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91 /* TCT_Control_To_System Transfer control to system */ |
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92 /* TCT_System_Protect Protect semaphore */ |
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93 /* TCT_Unprotect Release protection */ |
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94 /* */ |
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95 /* INPUTS */ |
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96 /* */ |
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97 /* semaphore_ptr Semaphore control block ptr */ |
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98 /* initial_count Initial count to reset the */ |
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99 /* semaphore to */ |
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100 /* */ |
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101 /* OUTPUTS */ |
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102 /* */ |
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103 /* NU_SUCCESS */ |
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104 /* */ |
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105 /* HISTORY */ |
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106 /* */ |
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107 /* DATE REMARKS */ |
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108 /* */ |
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109 /* 03-01-1993 Created initial version 1.0 */ |
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110 /* 04-19-1993 Verified version 1.0 */ |
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111 /* 03-01-1994 Changed function interface to */ |
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112 /* match the prototype, added */ |
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113 /* register variable logic, */ |
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114 /* optimized protection logic, */ |
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115 /* resulting in version 1.1 */ |
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116 /* */ |
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117 /* 03-18-1994 Verified version 1.1 */ |
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118 /* */ |
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119 /*************************************************************************/ |
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120 STATUS SMS_Reset_Semaphore(NU_SEMAPHORE *semaphore_ptr, |
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121 UNSIGNED initial_count) |
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122 { |
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123 |
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124 R1 SM_SCB *semaphore; /* Semaphore control blk ptr */ |
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125 R2 SM_SUSPEND *suspend_ptr; /* Suspend block pointer */ |
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126 R3 SM_SUSPEND *next_ptr; /* Next suspend block pointer*/ |
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127 STATUS preempt; /* Status for resume call */ |
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128 NU_SUPERV_USER_VARIABLES |
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129 |
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130 /* Switch to supervisor mode */ |
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131 NU_SUPERVISOR_MODE(); |
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132 |
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133 /* Move input semaphore pointer into internal pointer. */ |
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134 semaphore = (SM_SCB *) semaphore_ptr; |
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135 |
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136 #ifdef NU_ENABLE_STACK_CHECK |
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137 |
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138 /* Call stack checking function to check for an overflow condition. */ |
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139 TCT_Check_Stack(); |
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140 |
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141 #endif |
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142 |
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143 #ifdef NU_ENABLE_HISTORY |
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144 |
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145 /* Make an entry that corresponds to this function in the system history |
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146 log. */ |
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147 HIC_Make_History_Entry(NU_RESET_SEMAPHORE_ID, (UNSIGNED) semaphore, |
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148 (UNSIGNED) initial_count, (UNSIGNED) 0); |
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149 |
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150 #endif |
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151 |
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152 /* Protect against access to the semaphore. */ |
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153 TCT_System_Protect(); |
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154 |
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155 /* Pickup the suspended task pointer list. */ |
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156 suspend_ptr = semaphore -> sm_suspension_list; |
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157 |
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158 /* Walk the chain task(s) currently suspended on the semaphore. */ |
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159 preempt = 0; |
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160 while (suspend_ptr) |
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161 { |
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162 |
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163 /* Resume the suspended task. Insure that the status returned is |
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164 NU_SEMAPHORE_RESET. */ |
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165 suspend_ptr -> sm_return_status = NU_SEMAPHORE_RESET; |
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166 |
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167 /* Point to the next suspend structure in the link. */ |
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168 next_ptr = (SM_SUSPEND *) (suspend_ptr -> sm_suspend_link.cs_next); |
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169 |
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170 /* Resume the specified task. */ |
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171 preempt = preempt | |
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172 TCC_Resume_Task((NU_TASK *) suspend_ptr -> sm_suspended_task, |
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173 NU_SEMAPHORE_SUSPEND); |
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174 |
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175 /* Determine if the next is the same as the current pointer. */ |
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176 if (next_ptr == semaphore -> sm_suspension_list) |
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177 |
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178 /* Clear the suspension pointer to signal the end of the list |
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179 traversal. */ |
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180 suspend_ptr = NU_NULL; |
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181 else |
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182 |
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183 /* Move the next pointer into the suspend block pointer. */ |
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184 suspend_ptr = next_ptr; |
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185 } |
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186 |
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187 /* Initialize the semaphore. */ |
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188 semaphore -> sm_semaphore_count = initial_count; |
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189 semaphore -> sm_tasks_waiting = 0; |
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190 semaphore -> sm_suspension_list = NU_NULL; |
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191 |
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192 #ifdef INCLUDE_PROVIEW |
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193 _RTProf_DumpSema(RT_PROF_RESET_SEMAPHORE,(SM_SCB *) semaphore, RT_PROF_OK); |
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194 #endif |
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195 |
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196 /* Determine if preemption needs to occur. */ |
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197 if (preempt) |
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198 |
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199 /* Transfer control to system to facilitate preemption. */ |
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200 TCT_Control_To_System(); |
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201 |
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202 /* Release protection against access to the semaphore. */ |
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203 TCT_Unprotect(); |
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204 |
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205 /* Return to user mode */ |
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206 NU_USER_MODE(); |
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207 |
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208 /* Return a successful completion. */ |
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209 return(NU_SUCCESS); |
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210 } |
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211 |
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212 |
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213 |
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214 |