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Comparing libev/ev.pod (file contents):
Revision 1.444 by root, Mon Oct 29 00:00:22 2018 UTC vs.
Revision 1.446 by root, Mon Mar 18 19:28:15 2019 UTC

… …
265 265
266You could override this function in high-availability programs to, say, 266You could override this function in high-availability programs to, say,
267free some memory if it cannot allocate memory, to use a special allocator, 267free some memory if it cannot allocate memory, to use a special allocator,
268or even to sleep a while and retry until some memory is available. 268or even to sleep a while and retry until some memory is available.
269 269
270Example: The following is the C<realloc> function that libev itself uses
271which should work with C<realloc> and C<free> functions of all kinds and
272is probably a good basis for your own implementation.
273
274 static void *
275 ev_realloc_emul (void *ptr, long size) EV_NOEXCEPT
276 {
277 if (size)
278 return realloc (ptr, size);
279
280 free (ptr);
281 return 0;
282 }
283
270Example: Replace the libev allocator with one that waits a bit and then 284Example: Replace the libev allocator with one that waits a bit and then
271retries (example requires a standards-compliant C<realloc>). 285retries.
272 286
273 static void * 287 static void *
274 persistent_realloc (void *ptr, size_t size) 288 persistent_realloc (void *ptr, size_t size)
275 { 289 {
290 if (!size)
291 {
292 free (ptr);
293 return 0;
294 }
295
276 for (;;) 296 for (;;)
277 { 297 {
278 void *newptr = realloc (ptr, size); 298 void *newptr = realloc (ptr, size);
279 299
280 if (newptr) 300 if (newptr)
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3978The normal C API should work fine when used from C++: both ev.h and the 3998The normal C API should work fine when used from C++: both ev.h and the
3979libev sources can be compiled as C++. Therefore, code that uses the C API 3999libev sources can be compiled as C++. Therefore, code that uses the C API
3980will work fine. 4000will work fine.
3981 4001
3982Proper exception specifications might have to be added to callbacks passed 4002Proper exception specifications might have to be added to callbacks passed
3983to libev: exceptions may be thrown only from watcher callbacks, all 4003to libev: exceptions may be thrown only from watcher callbacks, all other
3984other callbacks (allocator, syserr, loop acquire/release and periodic 4004callbacks (allocator, syserr, loop acquire/release and periodic reschedule
3985reschedule callbacks) must not throw exceptions, and might need a C<throw 4005callbacks) must not throw exceptions, and might need a C<noexcept>
3986()> specification. If you have code that needs to be compiled as both C 4006specification. If you have code that needs to be compiled as both C and
3987and C++ you can use the C<EV_THROW> macro for this: 4007C++ you can use the C<EV_NOEXCEPT> macro for this:
3988 4008
3989 static void 4009 static void
3990 fatal_error (const char *msg) EV_THROW 4010 fatal_error (const char *msg) EV_NOEXCEPT
3991 { 4011 {
3992 perror (msg); 4012 perror (msg);
3993 abort (); 4013 abort ();
3994 } 4014 }
3995 4015

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