| … | |
… | |
| 196 | See the description of C<ev_embed> watchers for more info. |
196 | See the description of C<ev_embed> watchers for more info. |
| 197 | |
197 | |
| 198 | =item ev_set_allocator (void *(*cb)(void *ptr, long size)) |
198 | =item ev_set_allocator (void *(*cb)(void *ptr, long size)) |
| 199 | |
199 | |
| 200 | Sets the allocation function to use (the prototype is similar - the |
200 | Sets the allocation function to use (the prototype is similar - the |
| 201 | semantics is identical - to the realloc C function). It is used to |
201 | semantics are identical to the C<realloc> C89/SuS/POSIX function). It is |
| 202 | allocate and free memory (no surprises here). If it returns zero when |
202 | used to allocate and free memory (no surprises here). If it returns zero |
| 203 | memory needs to be allocated, the library might abort or take some |
203 | when memory needs to be allocated (C<size != 0>), the library might abort |
| 204 | potentially destructive action. The default is your system realloc |
204 | or take some potentially destructive action. |
| 205 | function. |
205 | |
|
|
206 | Since some systems (at least OpenBSD and Darwin) fail to implement |
|
|
207 | correct C<realloc> semantics, libev will use a wrapper around the system |
|
|
208 | C<realloc> and C<free> functions by default. |
| 206 | |
209 | |
| 207 | You could override this function in high-availability programs to, say, |
210 | You could override this function in high-availability programs to, say, |
| 208 | free some memory if it cannot allocate memory, to use a special allocator, |
211 | free some memory if it cannot allocate memory, to use a special allocator, |
| 209 | or even to sleep a while and retry until some memory is available. |
212 | or even to sleep a while and retry until some memory is available. |
| 210 | |
213 | |
| 211 | Example: Replace the libev allocator with one that waits a bit and then |
214 | Example: Replace the libev allocator with one that waits a bit and then |
| 212 | retries). |
215 | retries (example requires a standards-compliant C<realloc>). |
| 213 | |
216 | |
| 214 | static void * |
217 | static void * |
| 215 | persistent_realloc (void *ptr, size_t size) |
218 | persistent_realloc (void *ptr, size_t size) |
| 216 | { |
219 | { |
| 217 | for (;;) |
220 | for (;;) |
| … | |
… | |
| 1631 | When C<inotify (7)> support has been compiled into libev (generally only |
1634 | When C<inotify (7)> support has been compiled into libev (generally only |
| 1632 | available on Linux) and present at runtime, it will be used to speed up |
1635 | available on Linux) and present at runtime, it will be used to speed up |
| 1633 | change detection where possible. The inotify descriptor will be created lazily |
1636 | change detection where possible. The inotify descriptor will be created lazily |
| 1634 | when the first C<ev_stat> watcher is being started. |
1637 | when the first C<ev_stat> watcher is being started. |
| 1635 | |
1638 | |
| 1636 | Inotify presense does not change the semantics of C<ev_stat> watchers |
1639 | Inotify presence does not change the semantics of C<ev_stat> watchers |
| 1637 | except that changes might be detected earlier, and in some cases, to avoid |
1640 | except that changes might be detected earlier, and in some cases, to avoid |
| 1638 | making regular C<stat> calls. Even in the presense of inotify support |
1641 | making regular C<stat> calls. Even in the presence of inotify support |
| 1639 | there are many cases where libev has to resort to regular C<stat> polling. |
1642 | there are many cases where libev has to resort to regular C<stat> polling. |
| 1640 | |
1643 | |
| 1641 | (There is no support for kqueue, as apparently it cannot be used to |
1644 | (There is no support for kqueue, as apparently it cannot be used to |
| 1642 | implement this functionality, due to the requirement of having a file |
1645 | implement this functionality, due to the requirement of having a file |
| 1643 | descriptor open on the object at all times). |
1646 | descriptor open on the object at all times). |
| … | |
… | |
| 2375 | |
2378 | |
| 2376 | =item * Priorities are not currently supported. Initialising priorities |
2379 | =item * Priorities are not currently supported. Initialising priorities |
| 2377 | will fail and all watchers will have the same priority, even though there |
2380 | will fail and all watchers will have the same priority, even though there |
| 2378 | is an ev_pri field. |
2381 | is an ev_pri field. |
| 2379 | |
2382 | |
|
|
2383 | =item * In libevent, the last base created gets the signals, in libev, the |
|
|
2384 | first base created (== the default loop) gets the signals. |
|
|
2385 | |
| 2380 | =item * Other members are not supported. |
2386 | =item * Other members are not supported. |
| 2381 | |
2387 | |
| 2382 | =item * The libev emulation is I<not> ABI compatible to libevent, you need |
2388 | =item * The libev emulation is I<not> ABI compatible to libevent, you need |
| 2383 | to use the libev header file and library. |
2389 | to use the libev header file and library. |
| 2384 | |
2390 | |
