ObjFW  Artifact [49f47f6ab0]

Artifact 49f47f6ab0234195efc6ff042508e28f7bf2016bc236fab042aae618c487d8a7:

• File src/OFStreamObserver_kqueue.m — part of check-in [3d16a30f41] at 2013-06-22 12:12:36 on branch trunk — Rework exceptions.

  This mostly removes the argument for the class in which the exception
  occurred. As backtraces were recently added for all platforms, the
  passed class does not give any extra information on where the exception
  occurred anymore.

  This also removes a few other arguments which were not too helpful. In
  the past, the idea was to pass as many arguments as possible so that it
  is easier to find the origin of the exception. However, as backtraces
  are a much better way to find the origin, those are not useful anymore
  and just make the exception more cumbersome to use. The rule is now to
  only pass arguments that might help in recovering from the exception or
  provide information that is otherwise not easily accessible. (user: js, size: 4030) [annotate] [blame] [check-ins using]

/*
 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
 *   Jonathan Schleifer <js@webkeks.org>
 *
 * All rights reserved.
 *
 * This file is part of ObjFW. It may be distributed under the terms of the
 * Q Public License 1.0, which can be found in the file LICENSE.QPL included in
 * the packaging of this file.
 *
 * Alternatively, it may be distributed under the terms of the GNU General
 * Public License, either version 2 or 3, which can be found in the file
 * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
 * file.
 */

#include "config.h"

#include <math.h>
#include <unistd.h>
#include <errno.h>

#include <assert.h>

#include <sys/types.h>
#include <sys/event.h>
#include <sys/time.h>

#import "OFStreamObserver_kqueue.h"
#import "OFDataArray.h"

#import "OFInitializationFailedException.h"
#import "OFOutOfMemoryException.h"
#import "OFOutOfRangeException.h"

#import "autorelease.h"
#import "macros.h"

#define EVENTLIST_SIZE 64

@implementation OFStreamObserver_kqueue
- init
{
	self = [super init];

	@try {
		if ((_kernelQueue = kqueue()) == -1)
			@throw [OFInitializationFailedException
			    exceptionWithClass: [self class]];

		_changeList = [[OFDataArray alloc] initWithItemSize:
		    sizeof(struct kevent)];

		[self OF_addFileDescriptorForReading: _cancelFD[0]];
	} @catch (id e) {
		[self release];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	close(_kernelQueue);
	[_changeList release];

	[super dealloc];
}

- (void)OF_addFileDescriptorForReading: (int)fd
{
	struct kevent event;

	if ([_changeList count] >= INT_MAX)
		@throw [OFOutOfRangeException exception];

	EV_SET(&event, fd, EVFILT_READ, EV_ADD, 0, 0, 0);
	[_changeList addItem: &event];
}

- (void)OF_addFileDescriptorForWriting: (int)fd
{
	struct kevent event;

	if ([_changeList count] >= INT_MAX)
		@throw [OFOutOfRangeException exception];

	EV_SET(&event, fd, EVFILT_WRITE, EV_ADD, 0, 0, 0);
	[_changeList addItem: &event];
}

- (void)OF_removeFileDescriptorForReading: (int)fd
{
	struct kevent event;

	EV_SET(&event, fd, EVFILT_READ, EV_DELETE, 0, 0, 0);
	[_changeList addItem: &event];
}

- (void)OF_removeFileDescriptorForWriting: (int)fd
{
	struct kevent event;

	EV_SET(&event, fd, EVFILT_WRITE, EV_DELETE, 0, 0, 0);
	[_changeList addItem: &event];
}

- (bool)observeForTimeInterval: (double)timeInterval
{
	void *pool = objc_autoreleasePoolPush();
	struct timespec timeout;
	struct kevent eventList[EVENTLIST_SIZE];
	int i, events, realEvents = 0;

	timeout.tv_sec = (time_t)timeInterval;
	timeout.tv_nsec = lrint((timeInterval - timeout.tv_sec) * 1000000000);

	[self OF_processQueue];

	if ([self OF_processCache]) {
		objc_autoreleasePoolPop(pool);
		return true;
	}

	objc_autoreleasePoolPop(pool);

	events = kevent(_kernelQueue, [_changeList items],
	    (int)[_changeList count], eventList, EVENTLIST_SIZE,
	    (timeInterval == -1 ? NULL : &timeout));

	if (events < 0)
		return false;

	[_changeList removeAllItems];

	if (events == 0)
		return false;

	for (i = 0; i < events; i++) {
		if (eventList[i].ident == _cancelFD[0]) {
			char buffer;

			OF_ENSURE(read(_cancelFD[0], &buffer, 1) > 0);

			continue;
		}

		realEvents++;

		pool = objc_autoreleasePoolPush();

		if (eventList[i].flags & EV_ERROR) {
			if ([_delegate respondsToSelector:
			    @selector(streamDidReceiveException:)])
				[_delegate streamDidReceiveException:
				    _FDToStream[eventList[i].ident]];

			objc_autoreleasePoolPop(pool);
			continue;
		}

		switch (eventList[i].filter) {
		case EVFILT_READ:
			if ([_delegate respondsToSelector:
			    @selector(streamIsReadyForReading:)])
				[_delegate streamIsReadyForReading:
				    _FDToStream[eventList[i].ident]];
			break;
		case EVFILT_WRITE:
			if ([_delegate respondsToSelector:
			    @selector(streamIsReadyForWriting:)])
				[_delegate streamIsReadyForWriting:
				    _FDToStream[eventList[i].ident]];
			break;
		default:
			assert(0);
		}

		objc_autoreleasePoolPop(pool);
	}

	if (realEvents == 0)
		return false;

	return true;
}
@end