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116 | unsigned header_length; /* size of aio_ring */ |
116 | unsigned header_length; /* size of aio_ring */ |
117 | |
117 | |
118 | struct io_event io_events[0]; |
118 | struct io_event io_events[0]; |
119 | }; |
119 | }; |
120 | |
120 | |
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121 | /* |
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122 | * define some syscall wrappers for common architectures |
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123 | * this is mostly for nice looks during debugging, not performance. |
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124 | * our syscalls return < 0, not == -1, on error. which is good |
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125 | * enough for linux aio. |
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126 | * TODO: arm is also common nowadays, maybe even mips and x86 |
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127 | * TODO: after implementing this, it suddenly looks like overkill, but its hard to remove... |
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128 | */ |
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129 | #if __GNUC__ && __linux && ECB_AMD64 |
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130 | |
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131 | #define ev_syscall(nr,narg,arg1,arg2,arg3,arg4,arg5) \ |
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132 | ({ \ |
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133 | long res; \ |
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134 | register unsigned long r5 __asm__ ("r8" ); \ |
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135 | register unsigned long r4 __asm__ ("r10"); \ |
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136 | register unsigned long r3 __asm__ ("rdx"); \ |
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137 | register unsigned long r2 __asm__ ("rsi"); \ |
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138 | register unsigned long r1 __asm__ ("rdi"); \ |
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139 | if (narg >= 5) r5 = (unsigned long)(arg5); \ |
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140 | if (narg >= 4) r4 = (unsigned long)(arg4); \ |
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141 | if (narg >= 3) r3 = (unsigned long)(arg3); \ |
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142 | if (narg >= 2) r2 = (unsigned long)(arg2); \ |
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143 | if (narg >= 1) r1 = (unsigned long)(arg1); \ |
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144 | __asm__ __volatile__ ( \ |
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145 | "syscall\n\t" \ |
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146 | : "=a" (res) \ |
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147 | : "0" (nr), "r" (r1), "r" (r2), "r" (r3), "r" (r4), "r" (r5) \ |
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148 | : "cc", "r11", "cx", "memory"); \ |
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149 | errno = -res; \ |
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150 | res; \ |
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151 | }) |
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152 | |
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153 | #endif |
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154 | |
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155 | #ifdef ev_syscall |
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156 | #define ev_syscall0(nr) ev_syscall (nr, 0, 0, 0, 0, 0, 0 |
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157 | #define ev_syscall1(nr,arg1) ev_syscall (nr, 1, arg1, 0, 0, 0, 0) |
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158 | #define ev_syscall2(nr,arg1,arg2) ev_syscall (nr, 2, arg1, arg2, 0, 0, 0) |
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159 | #define ev_syscall3(nr,arg1,arg2,arg3) ev_syscall (nr, 3, arg1, arg2, arg3, 0, 0) |
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160 | #define ev_syscall4(nr,arg1,arg2,arg3,arg4) ev_syscall (nr, 3, arg1, arg2, arg3, arg4, 0) |
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161 | #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5) ev_syscall (nr, 5, arg1, arg2, arg3, arg4, arg5) |
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162 | #else |
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163 | #define ev_syscall0(nr) syscall (nr) |
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164 | #define ev_syscall1(nr,arg1) syscall (nr, arg1) |
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165 | #define ev_syscall2(nr,arg1,arg2) syscall (nr, arg1, arg2) |
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166 | #define ev_syscall3(nr,arg1,arg2,arg3) syscall (nr, arg1, arg2, arg3) |
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167 | #define ev_syscall4(nr,arg1,arg2,arg3,arg4) syscall (nr, arg1, arg2, arg3, arg4) |
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168 | #define ev_syscall5(nr,arg1,arg2,arg3,arg4,arg5) syscall (nr, arg1, arg2, arg3, arg4, arg5) |
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169 | #endif |
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170 | |
121 | inline_size |
171 | inline_size |
122 | int |
172 | int |
123 | evsys_io_setup (unsigned nr_events, aio_context_t *ctx_idp) |
173 | evsys_io_setup (unsigned nr_events, aio_context_t *ctx_idp) |
124 | { |
174 | { |
125 | return syscall (SYS_io_setup, nr_events, ctx_idp); |
175 | return ev_syscall2 (SYS_io_setup, nr_events, ctx_idp); |
126 | } |
176 | } |
127 | |
177 | |
128 | inline_size |
178 | inline_size |
129 | int |
179 | int |
130 | evsys_io_destroy (aio_context_t ctx_id) |
180 | evsys_io_destroy (aio_context_t ctx_id) |
131 | { |
181 | { |
132 | return syscall (SYS_io_destroy, ctx_id); |
182 | return ev_syscall1 (SYS_io_destroy, ctx_id); |
133 | } |
183 | } |
134 | |
184 | |
135 | inline_size |
185 | inline_size |
136 | int |
186 | int |
137 | evsys_io_submit (aio_context_t ctx_id, long nr, struct iocb *cbp[]) |
187 | evsys_io_submit (aio_context_t ctx_id, long nr, struct iocb *cbp[]) |
138 | { |
188 | { |
139 | return syscall (SYS_io_submit, ctx_id, nr, cbp); |
189 | return ev_syscall3 (SYS_io_submit, ctx_id, nr, cbp); |
140 | } |
190 | } |
141 | |
191 | |
142 | inline_size |
192 | inline_size |
143 | int |
193 | int |
144 | evsys_io_cancel (aio_context_t ctx_id, struct iocb *cbp, struct io_event *result) |
194 | evsys_io_cancel (aio_context_t ctx_id, struct iocb *cbp, struct io_event *result) |
145 | { |
195 | { |
146 | return syscall (SYS_io_cancel, ctx_id, cbp, result); |
196 | return ev_syscall3 (SYS_io_cancel, ctx_id, cbp, result); |
147 | } |
197 | } |
148 | |
198 | |
149 | inline_size |
199 | inline_size |
150 | int |
200 | int |
151 | evsys_io_getevents (aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout) |
201 | evsys_io_getevents (aio_context_t ctx_id, long min_nr, long nr, struct io_event *events, struct timespec *timeout) |
152 | { |
202 | { |
153 | return syscall (SYS_io_getevents, ctx_id, min_nr, nr, events, timeout); |
203 | return ev_syscall5 (SYS_io_getevents, ctx_id, min_nr, nr, events, timeout); |
154 | } |
204 | } |
155 | |
205 | |
156 | /*****************************************************************************/ |
206 | /*****************************************************************************/ |
157 | /* actual backed implementation */ |
207 | /* actual backed implementation */ |
158 | |
208 | |
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240 | if (iocb->io.aio_reqprio < 0) |
290 | if (iocb->io.aio_reqprio < 0) |
241 | { |
291 | { |
242 | /* we handed this fd over to epoll, so undo this first */ |
292 | /* we handed this fd over to epoll, so undo this first */ |
243 | /* we do it manually because the optimisations on epoll_modfy won't do us any good */ |
293 | /* we do it manually because the optimisations on epoll_modfy won't do us any good */ |
244 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
294 | epoll_ctl (backend_fd, EPOLL_CTL_DEL, fd, 0); |
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295 | anfds [fd].emask = 0; |
245 | iocb->io.aio_reqprio = 0; |
296 | iocb->io.aio_reqprio = 0; |
246 | } |
297 | } |
247 | |
298 | |
248 | if (iocb->io.aio_buf) |
299 | if (iocb->io.aio_buf) |
249 | /* io_cancel always returns some error on relevant kernels, but works */ |
300 | /* io_cancel always returns some error on relevant kernels, but works */ |