/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016
* Jonathan Schleifer <js@heap.zone>
*
* 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 <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/epoll.h>
#import "OFKernelEventObserver.h"
#import "OFKernelEventObserver+Private.h"
#import "OFKernelEventObserver_epoll.h"
#import "OFArray.h"
#import "OFMapTable.h"
#import "OFNull.h"
#ifdef OF_HAVE_THREADS
# import "OFMutex.h"
#endif
#import "OFInitializationFailedException.h"
#import "OFObserveFailedException.h"
#define EVENTLIST_SIZE 64
static const of_map_table_functions_t mapFunctions = { NULL };
@implementation OFKernelEventObserver_epoll
- init
{
self = [super init];
@try {
struct epoll_event event;
#ifdef HAVE_EPOLL_CREATE1
if ((_epfd = epoll_create1(EPOLL_CLOEXEC)) == -1)
@throw [OFInitializationFailedException exception];
#else
int flags;
if ((_epfd = epoll_create(1)) == -1)
@throw [OFInitializationFailedException exception];
if ((flags = fcntl(_epfd, F_GETFD, 0)) != -1)
fcntl(_epfd, F_SETFD, flags | FD_CLOEXEC);
#endif
_FDToEvents = [[OFMapTable alloc]
initWithKeyFunctions: mapFunctions
valueFunctions: mapFunctions];
memset(&event, 0, sizeof(event));
event.events = EPOLLIN;
event.data.ptr = [OFNull null];
if (epoll_ctl(_epfd, EPOLL_CTL_ADD, _cancelFD[0], &event) == -1)
@throw [OFInitializationFailedException exception];
} @catch (id e) {
[self release];
@throw e;
}
return self;
}
- (void)dealloc
{
close(_epfd);
[_FDToEvents release];
[super dealloc];
}
- (void)OF_addObject: (id)object
fileDescriptor: (int)fd
events: (int)addEvents
objectsArray: (OFMutableArray*)objectsArray
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
@try {
#endif
struct epoll_event event;
intptr_t events;
events = (intptr_t)[_FDToEvents
valueForKey: (void*)(intptr_t)fd];
memset(&event, 0, sizeof(event));
event.events = (int)events | addEvents;
event.data.ptr = object;
[objectsArray addObject: object];
if (epoll_ctl(_epfd,
(events == 0 ? EPOLL_CTL_ADD : EPOLL_CTL_MOD),
fd, &event) == -1) {
[objectsArray removeObjectIdenticalTo: object];
@throw [OFObserveFailedException
exceptionWithObserver: self
errNo: errno];
}
[_FDToEvents setValue: (void*)(events | addEvents)
forKey: (void*)(intptr_t)fd];
#ifdef OF_HAVE_THREADS
} @finally {
[_mutex unlock];
}
#endif
}
- (void)OF_removeObject: (id)object
fileDescriptor: (int)fd
events: (int)removeEvents
objectsArray: (OFMutableArray*)objectsArray
{
#ifdef OF_HAVE_THREADS
[_mutex lock];
@try {
#endif
intptr_t events;
events = (intptr_t)[_FDToEvents
valueForKey: (void*)(intptr_t)fd];
events &= ~removeEvents;
if (events == 0) {
if (epoll_ctl(_epfd, EPOLL_CTL_DEL, fd, NULL) == -1)
@throw [OFObserveFailedException
exceptionWithObserver: self
errNo: errno];
[_FDToEvents removeValueForKey: (void*)(intptr_t)fd];
} else {
struct epoll_event event;
memset(&event, 0, sizeof(event));
event.events = (int)events;
event.data.ptr = object;
if (epoll_ctl(_epfd, EPOLL_CTL_MOD, fd, &event) == -1)
@throw [OFObserveFailedException
exceptionWithObserver: self
errNo: errno];
[_FDToEvents setValue: (void*)events
forKey: (void*)(intptr_t)fd];
}
[objectsArray removeObjectIdenticalTo: object];
#ifdef OF_HAVE_THREADS
} @finally {
[_mutex unlock];
}
#endif
}
- (void)addObjectForReading: (id <OFReadyForReadingObserving>)object
{
[self OF_addObject: object
fileDescriptor: [object fileDescriptorForReading]
events: EPOLLIN
objectsArray: _readObjects];
}
- (void)addObjectForWriting: (id <OFReadyForWritingObserving>)object
{
[self OF_addObject: object
fileDescriptor: [object fileDescriptorForWriting]
events: EPOLLOUT
objectsArray: _writeObjects];
}
- (void)removeObjectForReading: (id <OFReadyForReadingObserving>)object
{
[self OF_removeObject: object
fileDescriptor: [object fileDescriptorForReading]
events: EPOLLIN
objectsArray: _readObjects];
}
- (void)removeObjectForWriting: (id <OFReadyForWritingObserving>)object
{
[self OF_removeObject: object
fileDescriptor: [object fileDescriptorForWriting]
events: EPOLLOUT
objectsArray: _writeObjects];
}
- (void)observeForTimeInterval: (of_time_interval_t)timeInterval
{
OFNull *nullObject = [OFNull null];
void *pool = objc_autoreleasePoolPush();
struct epoll_event eventList[EVENTLIST_SIZE];
int events;
[self OF_processReadBuffers];
objc_autoreleasePoolPop(pool);
events = epoll_wait(_epfd, eventList, EVENTLIST_SIZE,
(timeInterval != -1 ? timeInterval * 1000 : -1));
if (events < 0)
@throw [OFObserveFailedException exceptionWithObserver: self
errNo: errno];
for (int i = 0; i < events; i++) {
if (eventList[i].data.ptr == nullObject) {
char buffer;
assert(eventList[i].events == EPOLLIN);
OF_ENSURE(read(_cancelFD[0], &buffer, 1) == 1);
continue;
}
if (eventList[i].events & EPOLLIN) {
pool = objc_autoreleasePoolPush();
if ([_delegate respondsToSelector:
@selector(objectIsReadyForReading:)])
[_delegate objectIsReadyForReading:
eventList[i].data.ptr];
objc_autoreleasePoolPop(pool);
}
if (eventList[i].events & EPOLLOUT) {
pool = objc_autoreleasePoolPush();
if ([_delegate respondsToSelector:
@selector(objectIsReadyForWriting:)])
[_delegate objectIsReadyForWriting:
eventList[i].data.ptr];
objc_autoreleasePoolPop(pool);
}
assert((eventList[i].events & ~(EPOLLIN | EPOLLOUT)) == 0);
}
}
@end