diff options
| -rw-r--r-- | Changes | 1 | ||||
| -rw-r--r-- | ev.pod | 16 |
2 files changed, 12 insertions, 5 deletions
@@ -4,6 +4,7 @@ WISH? monotonic clocks times/GetTickCount for coarse corrections? 3.44 - new function: ev_now_update (loop). - verify_watcher was not marked static. + - improve the "associating..." manpage section. 3.43 Sun Jul 6 05:34:41 CEST 2008 - include more include files on windows to get struct _stati64 @@ -1008,7 +1008,11 @@ data: int otherfd; void *somedata; struct whatever *mostinteresting; - } + }; + + ... + struct my_io w; + ev_io_init (&w.io, my_cb, fd, EV_READ); And since your callback will be called with a pointer to the watcher, you can cast it back to your own type: @@ -1022,8 +1026,8 @@ can cast it back to your own type: More interesting and less C-conformant ways of casting your callback type instead have been omitted. -Another common scenario is having some data structure with multiple -watchers: +Another common scenario is to use some data structure with multiple +embedded watchers: struct my_biggy { @@ -1032,8 +1036,10 @@ watchers: ev_timer t2; } -In this case getting the pointer to C<my_biggy> is a bit more complicated, -you need to use C<offsetof>: +In this case getting the pointer to C<my_biggy> is a bit more +complicated: Either you store the address of your C<my_biggy> struct +in the C<data> member of the watcher, or you need to use some pointer +arithmetic using C<offsetof> inside your watchers: #include <stddef.h> |