… | |
… | |
396 | |
396 | |
397 | If this flag bit is or'ed into the flag value (or the program runs setuid |
397 | If this flag bit is or'ed into the flag value (or the program runs setuid |
398 | or setgid) then libev will I<not> look at the environment variable |
398 | or setgid) then libev will I<not> look at the environment variable |
399 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
399 | C<LIBEV_FLAGS>. Otherwise (the default), this environment variable will |
400 | override the flags completely if it is found in the environment. This is |
400 | override the flags completely if it is found in the environment. This is |
401 | useful to try out specific backends to test their performance, or to work |
401 | useful to try out specific backends to test their performance, to work |
402 | around bugs. |
402 | around bugs, or to make libev threadsafe (accessing environment variables |
|
|
403 | cannot be done in a threadsafe way, but usually it works if no other |
|
|
404 | thread modifies them). |
403 | |
405 | |
404 | =item C<EVFLAG_FORKCHECK> |
406 | =item C<EVFLAG_FORKCHECK> |
405 | |
407 | |
406 | Instead of calling C<ev_loop_fork> manually after a fork, you can also |
408 | Instead of calling C<ev_loop_fork> manually after a fork, you can also |
407 | make libev check for a fork in each iteration by enabling this flag. |
409 | make libev check for a fork in each iteration by enabling this flag. |
… | |
… | |
684 | reinitialise the kernel state for backends that have one. Despite the |
686 | reinitialise the kernel state for backends that have one. Despite the |
685 | name, you can call it anytime, but it makes most sense after forking, in |
687 | name, you can call it anytime, but it makes most sense after forking, in |
686 | the child process. You I<must> call it (or use C<EVFLAG_FORKCHECK>) in the |
688 | the child process. You I<must> call it (or use C<EVFLAG_FORKCHECK>) in the |
687 | child before resuming or calling C<ev_run>. |
689 | child before resuming or calling C<ev_run>. |
688 | |
690 | |
689 | Again, you I<have> to call it on I<any> loop that you want to re-use after |
691 | Again, you I<have> to call it on I<any> loop that you want to re-use after |
690 | a fork, I<even if you do not plan to use the loop in the parent>. This is |
692 | a fork, I<even if you do not plan to use the loop in the parent>. This is |
691 | because some kernel interfaces *cough* I<kqueue> *cough* do funny things |
693 | because some kernel interfaces *cough* I<kqueue> *cough* do funny things |
692 | during fork. |
694 | during fork. |
693 | |
695 | |
694 | On the other hand, you only need to call this function in the child |
696 | On the other hand, you only need to call this function in the child |
… | |
… | |
2606 | |
2608 | |
2607 | =head2 C<ev_stat> - did the file attributes just change? |
2609 | =head2 C<ev_stat> - did the file attributes just change? |
2608 | |
2610 | |
2609 | This watches a file system path for attribute changes. That is, it calls |
2611 | This watches a file system path for attribute changes. That is, it calls |
2610 | C<stat> on that path in regular intervals (or when the OS says it changed) |
2612 | C<stat> on that path in regular intervals (or when the OS says it changed) |
2611 | and sees if it changed compared to the last time, invoking the callback if |
2613 | and sees if it changed compared to the last time, invoking the callback |
2612 | it did. |
2614 | if it did. Starting the watcher C<stat>'s the file, so only changes that |
|
|
2615 | happen after the watcher has been started will be reported. |
2613 | |
2616 | |
2614 | The path does not need to exist: changing from "path exists" to "path does |
2617 | The path does not need to exist: changing from "path exists" to "path does |
2615 | not exist" is a status change like any other. The condition "path does not |
2618 | not exist" is a status change like any other. The condition "path does not |
2616 | exist" (or more correctly "path cannot be stat'ed") is signified by the |
2619 | exist" (or more correctly "path cannot be stat'ed") is signified by the |
2617 | C<st_nlink> field being zero (which is otherwise always forced to be at |
2620 | C<st_nlink> field being zero (which is otherwise always forced to be at |
… | |
… | |
3177 | |
3180 | |
3178 | =over 4 |
3181 | =over 4 |
3179 | |
3182 | |
3180 | =item ev_embed_init (ev_embed *, callback, struct ev_loop *embedded_loop) |
3183 | =item ev_embed_init (ev_embed *, callback, struct ev_loop *embedded_loop) |
3181 | |
3184 | |
3182 | =item ev_embed_set (ev_embed *, callback, struct ev_loop *embedded_loop) |
3185 | =item ev_embed_set (ev_embed *, struct ev_loop *embedded_loop) |
3183 | |
3186 | |
3184 | Configures the watcher to embed the given loop, which must be |
3187 | Configures the watcher to embed the given loop, which must be |
3185 | embeddable. If the callback is C<0>, then C<ev_embed_sweep> will be |
3188 | embeddable. If the callback is C<0>, then C<ev_embed_sweep> will be |
3186 | invoked automatically, otherwise it is the responsibility of the callback |
3189 | invoked automatically, otherwise it is the responsibility of the callback |
3187 | to invoke it (it will continue to be called until the sweep has been done, |
3190 | to invoke it (it will continue to be called until the sweep has been done, |
… | |
… | |
3979 | Libev comes with some simplistic wrapper classes for C++ that mainly allow |
3982 | Libev comes with some simplistic wrapper classes for C++ that mainly allow |
3980 | you to use some convenience methods to start/stop watchers and also change |
3983 | you to use some convenience methods to start/stop watchers and also change |
3981 | the callback model to a model using method callbacks on objects. |
3984 | the callback model to a model using method callbacks on objects. |
3982 | |
3985 | |
3983 | To use it, |
3986 | To use it, |
3984 | |
3987 | |
3985 | #include <ev++.h> |
3988 | #include <ev++.h> |
3986 | |
3989 | |
3987 | This automatically includes F<ev.h> and puts all of its definitions (many |
3990 | This automatically includes F<ev.h> and puts all of its definitions (many |
3988 | of them macros) into the global namespace. All C++ specific things are |
3991 | of them macros) into the global namespace. All C++ specific things are |
3989 | put into the C<ev> namespace. It should support all the same embedding |
3992 | put into the C<ev> namespace. It should support all the same embedding |
… | |
… | |
4617 | different cpus (or different cpu cores). This reduces dependencies |
4620 | different cpus (or different cpu cores). This reduces dependencies |
4618 | and makes libev faster. |
4621 | and makes libev faster. |
4619 | |
4622 | |
4620 | =item EV_NO_THREADS |
4623 | =item EV_NO_THREADS |
4621 | |
4624 | |
4622 | If defined to be C<1>, libev will assume that it will never be called |
4625 | If defined to be C<1>, libev will assume that it will never be called from |
4623 | from different threads, which is a stronger assumption than C<EV_NO_SMP>, |
4626 | different threads (that includes signal handlers), which is a stronger |
4624 | above. This reduces dependencies and makes libev faster. |
4627 | assumption than C<EV_NO_SMP>, above. This reduces dependencies and makes |
|
|
4628 | libev faster. |
4625 | |
4629 | |
4626 | =item EV_ATOMIC_T |
4630 | =item EV_ATOMIC_T |
4627 | |
4631 | |
4628 | Libev requires an integer type (suitable for storing C<0> or C<1>) whose |
4632 | Libev requires an integer type (suitable for storing C<0> or C<1>) whose |
4629 | access is atomic with respect to other threads or signal contexts. No |
4633 | access is atomic with respect to other threads or signal contexts. No |
… | |
… | |
5425 | =over 4 |
5429 | =over 4 |
5426 | |
5430 | |
5427 | =item C<EV_COMPAT3> backwards compatibility mechanism |
5431 | =item C<EV_COMPAT3> backwards compatibility mechanism |
5428 | |
5432 | |
5429 | The backward compatibility mechanism can be controlled by |
5433 | The backward compatibility mechanism can be controlled by |
5430 | C<EV_COMPAT3>. See L</PREPROCESSOR SYMBOLS/MACROS> in the L</EMBEDDING> |
5434 | C<EV_COMPAT3>. See L</"PREPROCESSOR SYMBOLS/MACROS"> in the L</EMBEDDING> |
5431 | section. |
5435 | section. |
5432 | |
5436 | |
5433 | =item C<ev_default_destroy> and C<ev_default_fork> have been removed |
5437 | =item C<ev_default_destroy> and C<ev_default_fork> have been removed |
5434 | |
5438 | |
5435 | These calls can be replaced easily by their C<ev_loop_xxx> counterparts: |
5439 | These calls can be replaced easily by their C<ev_loop_xxx> counterparts: |