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| 265 | or setgid) then libev will I<not> look at the environment variable |
265 | or setgid) then libev will I<not> look at the environment variable |
| 266 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
266 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
| 267 | override the flags completely if it is found in the environment. This is |
267 | override the flags completely if it is found in the environment. This is |
| 268 | useful to try out specific backends to test their performance, or to work |
268 | useful to try out specific backends to test their performance, or to work |
| 269 | around bugs. |
269 | around bugs. |
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270 | |
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271 | =item C<EVFLAG_FORKCHECK> |
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272 | |
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273 | Instead of calling C<ev_default_fork> or C<ev_loop_fork> manually after |
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274 | a fork, you can also make libev check for a fork in each iteration by |
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275 | enabling this flag. |
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276 | |
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277 | This works by calling C<getpid ()> on every iteration of the loop, |
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278 | and thus this might slow down your event loop if you do a lot of loop |
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279 | iterations and little real work, but is usually not noticable (on my |
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280 | Linux system for example, C<getpid> is actually a simple 5-insn sequence |
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281 | without a syscall and thus I<very> fast, but my Linux system also has |
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282 | C<pthread_atfork> which is even faster). |
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283 | |
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284 | The big advantage of this flag is that you can forget about fork (and |
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285 | forget about forgetting to tell libev about forking) when you use this |
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286 | flag. |
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287 | |
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288 | This flag setting cannot be overriden or specified in the C<LIBEV_FLAGS> |
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289 | environment variable. |
| 270 | |
290 | |
| 271 | =item C<EVBACKEND_SELECT> (value 1, portable select backend) |
291 | =item C<EVBACKEND_SELECT> (value 1, portable select backend) |
| 272 | |
292 | |
| 273 | This is your standard select(2) backend. Not I<completely> standard, as |
293 | This is your standard select(2) backend. Not I<completely> standard, as |
| 274 | libev tries to roll its own fd_set with no limits on the number of fds, |
294 | libev tries to roll its own fd_set with no limits on the number of fds, |
