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6926 | serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Copyright (C) KolibriOS team 2004-2017. All rights reserved. ;; |
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4 | ;; Distributed under terms of the GNU General Public License. ;; |
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5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 6917 $ |
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9 | |||
10 | O_CLOEXEC equ 0x40000 |
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11 | PIPE_BUFFER_SIZE equ 4096 |
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12 | |||
13 | |||
14 | iglobal |
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15 | align 4 |
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16 | pipe_file_ops: |
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17 | dd pipe_close ;0 |
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18 | dd pipe_read ;1 |
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19 | dd pipe_write ;2 |
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20 | endg |
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21 | |||
22 | ;int pipe2(int pipefd[2], int flags); |
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23 | ;ecx pipefd |
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24 | ;edx flags |
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25 | |||
26 | align 4 |
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27 | sys_pipe2: |
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28 | .pipeflags equ esp+16 |
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29 | .pipefd equ esp+12 |
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30 | .fdread equ esp+8 |
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31 | .fdwrite equ esp+4 |
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32 | .intpipe equ esp |
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33 | |||
34 | push ebp |
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35 | test ecx, ecx |
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36 | mov ebp, -EFAULT |
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37 | js .fail |
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38 | |||
39 | test edx, not O_CLOEXEC |
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40 | mov ebp, -EINVAL |
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41 | jnz .fail |
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42 | |||
43 | push ecx |
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44 | push edx |
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45 | sub esp, (5-2)*4 |
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46 | |||
47 | mov ecx, sizeof.FILED |
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48 | call create_object |
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49 | mov [.fdread], eax |
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50 | test eax, eax |
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51 | mov ebp, -EMFILE |
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52 | jz .err_0 |
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53 | |||
54 | mov ecx, sizeof.FILED |
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55 | call create_object |
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56 | mov [.fdwrite], eax |
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57 | test eax, eax |
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58 | jz .err_1 |
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59 | |||
60 | mov eax, sizeof.PIPE |
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61 | call malloc |
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62 | test eax, eax |
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63 | mov ebp, -ENFILE |
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64 | jz .err_2 |
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65 | |||
66 | mov ebp, eax |
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67 | |||
68 | stdcall create_ring_buffer, PIPE_BUFFER_SIZE, PG_SWR |
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69 | test eax, eax |
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70 | jz .err_3 |
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71 | |||
72 | mov [ebp+PIPE.pipe_ops], pipe_file_ops |
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73 | mov [ebp+PIPE.buffer], eax |
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74 | |||
75 | xor eax, eax |
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76 | mov [ebp+PIPE.count], eax |
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77 | mov [ebp+PIPE.read_end], eax |
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78 | mov [ebp+PIPE.write_end], eax |
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79 | |||
80 | inc eax |
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81 | mov [ebp+PIPE.readers], eax |
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82 | mov [ebp+PIPE.writers], eax |
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83 | |||
84 | lea ecx, [ebp+PIPE.pipe_lock] |
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85 | call mutex_init |
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86 | |||
87 | lea ecx, [ebp+PIPE.rlist] |
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88 | list_init ecx |
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89 | |||
90 | lea ecx, [ebp+PIPE.wlist] |
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91 | list_init ecx |
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92 | |||
93 | mov eax, [.fdread] |
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94 | mov edx, [.fdwrite] |
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95 | mov ecx, [.pipefd] |
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96 | |||
97 | mov [eax+FILED.magic], 'PIPE' |
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98 | mov [eax+FILED.destroy], 0 |
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99 | mov [eax+FILED.file], ebp |
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100 | |||
101 | mov [edx+FILED.magic], 'PIPE' |
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102 | mov [edx+FILED.destroy], 0 |
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103 | mov [edx+FILED.file], ebp |
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104 | |||
105 | mov [ecx], eax |
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106 | mov [ecx+4], edx |
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107 | add esp, 5*4 |
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108 | pop ebp |
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109 | xor eax, eax |
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110 | mov [esp+SYSCALL_STACK._eax], eax |
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111 | ret |
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112 | .err_3: |
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113 | mov eax, ebp |
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114 | call free |
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115 | mov ebp, -ENFILE |
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116 | .err_2: |
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117 | mov ecx, [.fdwrite] |
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118 | call destroy_object |
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119 | .err_1: |
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120 | mov ecx, [.fdread] |
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121 | call destroy_object |
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122 | .err_0: |
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123 | add esp, 5*4 |
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124 | .fail: |
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125 | mov [esp+SYSCALL_STACK._eax], ebp |
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126 | pop ebp |
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127 | ret |
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128 | |||
129 | purge .pipeflags |
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130 | purge .filefd |
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131 | purge .fdread |
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132 | purge .fdwrite |
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133 | purge .intpipe |
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134 | |||
135 | |||
136 | ; edx buf |
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137 | ; esi count |
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138 | ; ebp pipe |
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139 | |||
140 | align 4 |
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141 | pipe_read: |
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142 | mov edi, edx |
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6927 | serge | 143 | |
144 | .again: |
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6926 | serge | 145 | lea ecx, [ebp+PIPE.pipe_lock] |
146 | call mutex_lock |
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147 | |||
148 | xor eax, eax |
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149 | cmp eax, [ebp+PIPE.writers] |
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150 | je .eof |
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151 | |||
152 | mov ecx, [ebp+PIPE.count] |
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153 | test ecx, ecx |
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154 | jz .wait |
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155 | |||
156 | .check_count: |
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157 | cmp ecx, esi |
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158 | jb .read |
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159 | mov ecx, esi |
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160 | .read: |
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161 | mov esi, [ebp+PIPE.buffer] |
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162 | add esi, [ebp+PIPE.read_end] |
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163 | mov [esp+SYSCALL_STACK._eax], ecx |
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164 | sub [ebp+PIPE.count], ecx |
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165 | cld |
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6927 | serge | 166 | rep movsb |
6926 | serge | 167 | and esi, 0xFFF |
6927 | serge | 168 | mov [ebp+PIPE.read_end], esi |
6926 | serge | 169 | |
170 | lea ecx, [ebp+PIPE.pipe_lock] |
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171 | call mutex_unlock |
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172 | ret |
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173 | |||
174 | .wait: |
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175 | sub esp, sizeof.MUTEX_WAITER |
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176 | mov ebx, [TASK_BASE] |
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177 | mov [esp+MUTEX_WAITER.task], ebx |
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178 | lea edx, [ebp+PIPE.rlist] |
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179 | |||
180 | list_add_tail esp, edx ;esp= new waiter, edx= list head |
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181 | |||
182 | lea ecx, [ebp+PIPE.pipe_lock] |
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183 | call mutex_unlock |
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184 | |||
185 | mov [ebx+TASKDATA.state], 1 |
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186 | call change_task |
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187 | |||
6927 | serge | 188 | list_del esp |
189 | add esp, sizeof.MUTEX_WAITER |
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190 | jmp .again |
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191 | |||
192 | .eof: |
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193 | mov [esp+SYSCALL_STACK._eax], eax |
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6926 | serge | 194 | lea ecx, [ebp+PIPE.pipe_lock] |
6927 | serge | 195 | call mutex_unlock |
196 | ret |
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197 | |||
198 | ; edx buf |
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199 | ; esi count |
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200 | ; ebp pipe |
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201 | |||
202 | align 4 |
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203 | pipe_write: |
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204 | mov edi, edx |
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205 | |||
206 | .again: |
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207 | lea ecx, [ebp+PIPE.pipe_lock] |
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6926 | serge | 208 | call mutex_lock |
209 | |||
6927 | serge | 210 | xor eax, eax |
211 | cmp eax, [ebp+PIPE.readers] |
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212 | je .epipe |
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213 | |||
6926 | serge | 214 | mov ecx, [ebp+PIPE.count] |
6927 | serge | 215 | sub ecx, 4096 |
216 | jz .wait |
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6926 | serge | 217 | |
6927 | serge | 218 | .check_count: |
219 | cmp ecx, esi |
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220 | jb .write |
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221 | mov ecx, esi |
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222 | .write: |
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223 | mov esi, [ebp+PIPE.buffer] |
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224 | add esi, [ebp+PIPE.write_end] |
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225 | mov [esp+SYSCALL_STACK._eax], ecx |
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226 | add [ebp+PIPE.count], ecx |
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227 | cld |
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228 | rep movsb |
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229 | and esi, 0xFFF |
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230 | mov [ebp+PIPE.write_end], esi |
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231 | |||
232 | lea ecx, [ebp+PIPE.pipe_lock] |
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233 | call mutex_unlock |
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234 | ret |
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235 | |||
236 | .wait: |
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237 | sub esp, sizeof.MUTEX_WAITER |
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238 | mov ebx, [TASK_BASE] |
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239 | mov [esp+MUTEX_WAITER.task], ebx |
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240 | lea edx, [ebp+PIPE.wlist] |
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241 | |||
242 | list_add_tail esp, edx ;esp= new waiter, edx= list head |
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243 | |||
244 | lea ecx, [ebp+PIPE.pipe_lock] |
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245 | call mutex_unlock |
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246 | |||
247 | mov [ebx+TASKDATA.state], 1 |
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248 | call change_task |
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249 | |||
6926 | serge | 250 | list_del esp |
251 | add esp, sizeof.MUTEX_WAITER |
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6927 | serge | 252 | jmp .again |
6926 | serge | 253 | |
6927 | serge | 254 | .epipe: |
255 | mov [esp+SYSCALL_STACK._eax], -EPIPE |
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6926 | serge | 256 | lea ecx, [ebp+PIPE.pipe_lock] |
257 | call mutex_unlock |
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258 | ret |
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259 | |||
260 | align 4 |
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261 | pipe_close: |
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262 | mov [esp+SYSCALL_STACK._eax], -EBADF |
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263 | ret |