| … | |
… | |
| 137 | EOF |
137 | EOF |
| 138 | |
138 | |
| 139 | my $can_epoll = have_inc "sys/epoll.h"; |
139 | my $can_epoll = have_inc "sys/epoll.h"; |
| 140 | $can_epoll = $ENV{EV_EPOLL} if exists $ENV{EV_EPOLL}; |
140 | $can_epoll = $ENV{EV_EPOLL} if exists $ENV{EV_EPOLL}; |
| 141 | $DEFINE .= " -DEV_USE_EPOLL=" . (0 + (prompt ("Enable epoll backend (y/n)?", $can_epoll ? "y" : "n") =~ /[yY]/)); |
141 | $DEFINE .= " -DEV_USE_EPOLL=" . (0 + (prompt ("Enable epoll backend (y/n)?", $can_epoll ? "y" : "n") =~ /[yY]/)); |
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142 | |
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143 | print <<EOF; |
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144 | |
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145 | *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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146 | |
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147 | |
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148 | Linux 4.18 introduced another event polling interface, this time using |
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149 | the Linux AIO API. While this API is far superior to epoll and almost |
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150 | rivals kqueue, it also suffers from the same issues as kqueue typically |
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151 | does: only a subset of file types are supported (as of 4.19, I have seen |
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152 | eventfd, pipes, sockets files and some devices, but no ttys). It also |
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153 | is subject arbitrary system-wide limits imposed on it. Therefore, this |
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154 | backend is not used by default, even when it is compiled in, and you have |
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155 | to request it explicitly, e.g. with LIBEV_FLAGS=64. If unsure, accept the |
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156 | default. |
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157 | |
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158 | EOF |
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159 | |
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160 | my $can_linuxaio = have_inc "linux/aio_abi.h"; |
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161 | $can_linuxaio = $ENV{EV_LINUXAIO} if exists $ENV{EV_LINUXAIO}; |
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162 | $can_linuxaio = 0 + (prompt ("Enable linux aio backend (y/n)?", $can_linuxaio ? "y" : "n") =~ /[yY]/); |
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163 | $DEFINE .= " -DEV_USE_LINUXAIO=$can_linuxaio"; |
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164 | |
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165 | if ($can_linuxaio) { |
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166 | print <<EOF; |
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167 | |
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168 | *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
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169 | |
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170 | |
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171 | The previously mentioned Linux AIO backend is experimental and will not |
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172 | be used unless requested explicitly. You can, howeer, choose to make ti a |
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173 | recommended basckend, which means it will be chosen if available even when |
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174 | not explicitly asked for, in preference to epoll on GNU/Linux. This option |
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175 | is likely temporary. When unsure, accept the default. |
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176 | |
|
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177 | EOF |
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178 | |
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179 | my $recommend_linuxaio = 0; |
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180 | $recommend_linuxaio = $ENV{EV_RECOMMEND_LINUXAIO} if exists $ENV{EV_RECOMMEND_LINUXAIO}; |
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181 | $recommend_linuxaio = 0 + (prompt ("Treat linux aio as a recommended backend (y/n)?", $recommend_linuxaio ? "y" : "n") =~ /[yY]/); |
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182 | $DEFINE .= " -DEV_RECOMMEND_LINUXAIO=$recommend_linuxaio"; |
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183 | } |
| 142 | |
184 | |
| 143 | print <<EOF; |
185 | print <<EOF; |
| 144 | |
186 | |
| 145 | *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
187 | *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** |
| 146 | |
188 | |
