/usr/include/GNUstep/Performance/GSThreadPool.h is in libperformance-dev 0.5.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define INCLUDED_GSTHREADPOOL 1
/**
Copyright (C) 2010 Free Software Foundation, Inc.
Written by: Richard Frith-Macdonald <rfm@gnu.org>
Date: September 2010
This file is part of the Performance Library.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
*/
#import <Foundation/NSObject.h>
@class GSLinkedList;
@class NSDate;
@class NSLock;
/** This class provides a thread pool for performing methods
* of objects in parallel in other threads.<br />
* This is similar to the NSOperationQueue class but is a
* lightweight alternative designed to operate rather faster
* though with slightly decreased functionality ... for instance
* there is no dependency checking supported.
*/
@interface GSThreadPool : NSObject
{
NSRecursiveLock *poolLock;
BOOL shutdown;
BOOL suspended;
NSUInteger maxThreads;
GSLinkedList *idle;
GSLinkedList *live;
NSUInteger maxOperations;
GSLinkedList *operations;
GSLinkedList *unused;
NSUInteger processed;
}
/** Returns an instance intended for sharing between sections of code which
* wish to make use of threading by performing operations in other threads,
* but which don't mind operations being interleaved with those belonging to
* oither sections of code.<br />
* Always returns the same instance whenever the method is called.
*/
+ (GSThreadPool*) sharedPool;
/** Waits until the pool of operations is empty or until the specified
* timestamp. Returns YES if the pool was emptied, NO otherwise.
*/
- (BOOL) drain: (NSDate*)before;
/** Removes all operations which have not yet started, returning a count
* of the abandoned operations.
*/
- (NSUInteger) flush;
/** Returns YES if no operations are waiting to be performed, NO otherwise.
*/
- (BOOL) isEmpty;
/** Returns YES if NO operations are in progress, NO otherwise.
*/
- (BOOL) isIdle;
/** Returns YES if startup of new operations is suspended, NO otherwise.
*/
- (BOOL) isSuspended;
/** Returns the currently configured maximum number of operations which
* may be scheduled at any one time.
*/
- (NSUInteger) maxOperations;
/** Returns the currently configured maximum number of threads in the pool.
*/
- (NSUInteger) maxThreads;
/** Reverses the effect of -suspend.
*/
- (void) resume;
/** Adds the object to the queue for which operations should be performed.<br />
* You may add an object more than once, but that may result in the operation
* being performed simultaneously in more than one thread.<br />
* If the pool is configured with zero threads or zero operations,
* this method will simply perform the operation immediately.<br />
* The operation will be performed in a context where there is an exception
* handler set to trap exceptions, and an autorelease pool to deal with
* autoreleased objects.
*/
- (void) scheduleSelector: (SEL)aSelector
onReceiver: (NSObject*)aReceiver
withObject: (NSObject*)anArgument;
/** Specify the number of operations which may be waiting.<br />
* Default is 100.<br />
* Setting a value of zero ensures that operations are performed
* immediately rather than being queued.
*/
- (void) setOperations: (NSUInteger)max;
/** Specify the maximum number of threads in the pool (the actual number
* used may be lower than this value).<br />
* Default is 2.<br />
* The pool creates threads on demand up to the specified limit (or a lower
* limit if dictated by system resources) but will not destroy idle threads
* unless the limit is subsequently released.<br />
* Setting a value of zero means that operations are performed in the
* main thread. In this case -drain: will be used (with a 30 second limit)
* followed by -flush to ensure that the queue is emptied before the threads
* are shut down.
*/
- (void) setThreads: (NSUInteger)max;
/** Turns off startup of new operations.
*/
- (void) suspend;
@end
#endif
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