Differences From Artifact [9c1fba606a]:
- File src/OFKernelEventObserver_select.m — part of check-in [bbe4040126] at 2015-05-04 20:34:57 on branch trunk — Refactor OFKernelEventObserver (user: js, size: 4806) [annotate] [blame] [check-ins using]
To Artifact [331bf675cd]:
- File
src/OFKernelEventObserver_select.m
— part of check-in
[220513a3f5]
at
2015-05-09 18:13:19
on branch trunk
— More OFKernelEventObserver refactoring
This was necessary because select(), poll() and kevent() on FreeBSD and
OS X would sometimes return 0 events, even if there are some, and
sometimes return the correct number of events that were pending, meaning
the number of events returned is unreliable. To make things worse,
whether it returns 0 or the number of events that were pending is
completely non-deterministic on both FreeBSD and OS X (running the same
tests multiple times in a row would make it sometimes work and sometimes
fail).In order to prevent code from depending on the return value of
-[observeForTimeInterval:] (which would depend on select(), poll() and
kevent() returning the correct number), OFKernelObserver no longer
returns whether there were pending events. It is expected that
-[observe] or -[observeForTimeInterval:] is just called in a loop as
long as events should be handled.The tests have been changed as well to reflect this. What they do now is
set a deadline and call -[observeForTimeInterval:] with a small timeout
in a loop until the deadline is reached or all events have been handled.Note: DragonFlyBSD has not been tested, but will most likely behave like
FreeBSD and OS X. (user: js, size: 4581) [annotate] [blame] [check-ins using]
| ︙ | ︙ | |||
115 116 117 118 119 120 121 | if (fd >= FD_SETSIZE) @throw [OFOutOfRangeException exception]; FD_CLR(fd, &_writeFDs); } | | | < | < < < | 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 |
if (fd >= FD_SETSIZE)
@throw [OFOutOfRangeException exception];
FD_CLR(fd, &_writeFDs);
}
- (void)observeForTimeInterval: (of_time_interval_t)timeInterval
{
void *pool = objc_autoreleasePoolPush();
id const *objects;
fd_set readFDs;
fd_set writeFDs;
struct timeval timeout;
int events;
size_t i, count;
[self OF_processQueueAndStoreRemovedIn: nil];
[self OF_processReadBuffers];
objc_autoreleasePoolPop(pool);
#ifdef FD_COPY
FD_COPY(&_readFDs, &readFDs);
FD_COPY(&_writeFDs, &writeFDs);
#else
|
| ︙ | ︙ | |||
162 163 164 165 166 167 168 | events = select(_maxFD + 1, &readFDs, &writeFDs, NULL, (timeInterval != -1 ? &timeout : NULL)); if (events < 0) @throw [OFObserveFailedException exceptionWithObserver: self errNo: errno]; | < < < | < | | < < < | < | | < < < | < < < < < | 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 |
events = select(_maxFD + 1, &readFDs, &writeFDs, NULL,
(timeInterval != -1 ? &timeout : NULL));
if (events < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: errno];
if (FD_ISSET(_cancelFD[0], &readFDs)) {
char buffer;
#ifndef _WIN32
OF_ENSURE(read(_cancelFD[0], &buffer, 1) == 1);
#else
OF_ENSURE(recvfrom(_cancelFD[0], &buffer, 1, 0, NULL,
NULL) == 1);
#endif
}
objects = [_readObjects objects];
count = [_readObjects count];
for (i = 0; i < count; i++) {
int fd = [objects[i] fileDescriptorForReading];
pool = objc_autoreleasePoolPush();
if (FD_ISSET(fd, &readFDs) && [_delegate respondsToSelector:
@selector(objectIsReadyForReading:)])
[_delegate objectIsReadyForReading: objects[i]];
objc_autoreleasePoolPop(pool);
}
objects = [_writeObjects objects];
count = [_writeObjects count];
for (i = 0; i < count; i++) {
int fd = [objects[i] fileDescriptorForWriting];
pool = objc_autoreleasePoolPush();
if (FD_ISSET(fd, &writeFDs) && [_delegate respondsToSelector:
@selector(objectIsReadyForWriting:)])
[_delegate objectIsReadyForWriting: objects[i]];
objc_autoreleasePoolPop(pool);
}
}
@end
|