diff options
| author | root <root> | 2010-03-10 08:19:38 +0000 |
|---|---|---|
| committer | root <root> | 2010-03-10 08:19:38 +0000 |
| commit | 1e97f470d7efb51562242a32fa3145e02c19b030 (patch) | |
| tree | 3fce0950088557fc8b18c41e0ee7ce634910f9ba /ev.pod | |
| parent | 0bcdefb16b27d722ed252e7922f63c5caf2d801e (diff) | |
more minimal tuning, add truly minimal example
Diffstat (limited to 'ev.pod')
| -rw-r--r-- | ev.pod | 49 |
1 files changed, 48 insertions, 1 deletions
@@ -3868,11 +3868,21 @@ defined to be C<0>, then they are not. If undefined or defined to be C<1>, then fork watchers are supported. If defined to be C<0>, then they are not. +=item EV_SIGNAL_ENABLE + +If undefined or defined to be C<1>, then signal watchers are supported. If +defined to be C<0>, then they are not. + =item EV_ASYNC_ENABLE If undefined or defined to be C<1>, then async watchers are supported. If defined to be C<0>, then they are not. +=item EV_CHILD_ENABLE + +If undefined or defined to be C<1> (and C<_WIN32> is not defined), then +child watchers are supported. If defined to be C<0>, then they are not. + =item EV_MINIMAL If you need to shave off some kilobytes of code at the expense of some @@ -3883,13 +3893,50 @@ the default 4-heap. You can save even more by disabling watcher types you do not need and setting C<EV_MAXPRI> == C<EV_MINPRI>. Also, disabling C<assert> -(C<-DNDEBUG>) will usually reduce code size a lot. +(C<-DNDEBUG>) will usually reduce code size a lot. Disabling inotify, +eventfd and signalfd will further help, and disabling backends one doesn't +need (e.g. poll, epoll, kqueue, ports) will help further. Defining C<EV_MINIMAL> to C<2> will additionally reduce the core API to provide a bare-bones event library. See C<ev.h> for details on what parts of the API are still available, and do not complain if this subset changes over time. +This example set of settings reduces the compiled size of libev from 24Kb +to 8Kb on my GNU/Linux amd64 system (and leaves little in - there is also +an effect on the amount of memory used). With an intelligent-enough linker +further unused functions might be left out as well automatically. + + // tuning and API changes + #define EV_MINIMAL 2 + #define EV_MULTIPLICITY 0 + #define EV_MINPRI 0 + #define EV_MAXPRI 0 + + // OS-specific backends + #define EV_USE_INOTIFY 0 + #define EV_USE_EVENTFD 0 + #define EV_USE_SIGNALFD 0 + #define EV_USE_REALTIME 0 + #define EV_USE_MONOTONIC 0 + #define EV_USE_CLOCK_SYSCALL 0 + + // disable all backends except select + #define EV_USE_POLL 0 + #define EV_USE_PORT 0 + #define EV_USE_KQUEUE 0 + #define EV_USE_EPOLL 0 + + // disable all watcher types that cna be disabled + #define EV_STAT_ENABLE 0 + #define EV_PERIODIC_ENABLE 0 + #define EV_IDLE_ENABLE 0 + #define EV_FORK_ENABLE 0 + #define EV_SIGNAL_ENABLE 0 + #define EV_CHILD_ENABLE 0 + #define EV_ASYNC_ENABLE 0 + #define EV_EMBED_ENABLE 0 + =item EV_AVOID_STDIO If this is set to C<1> at compiletime, then libev will avoid using stdio |