Bug 18188 - DispatchQueuePriority does not support DISPATCH_QUEUE_PRIORITY_BACKGROUND
Summary: DispatchQueuePriority does not support DISPATCH_QUEUE_PRIORITY_BACKGROUND
Status: VERIFIED FIXED
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: master
Hardware: PC Mac OS
: --- normal
Target Milestone: 7.2.1
Assignee: Sebastien Pouliot
URL:
Depends on:
Blocks:
 
Reported: 2014-03-05 09:36 UTC by Paul Auman
Modified: 2014-03-21 02:38 UTC (History)
4 users (show)

Tags:
Is this bug a regression?: ---
Last known good build:

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Status:
VERIFIED FIXED

Description Paul Auman 2014-03-05 09:36:54 UTC
Apple Docs :

https://developer.apple.com/library/ios/documentation/Performance/Reference/GCD_libdispatch_Ref/Reference/reference.html#//apple_ref/doc/uid/TP40008079-CH103-SW2

dispatch_queue_priority_t
Used to select the appropriate global concurrent queue.

#define DISPATCH_QUEUE_PRIORITY_HIGH        2
#define DISPATCH_QUEUE_PRIORITY_DEFAULT     0
#define DISPATCH_QUEUE_PRIORITY_LOW         (-2)
#define DISPATCH_QUEUE_PRIORITY_BACKGROUND  INT16_MIN

DISPATCH_QUEUE_PRIORITY_BACKGROUND
Items dispatched to the queue run at background priority; the queue is scheduled for execution after all high priority queues have been scheduled and the system runs items on a thread whose priority is set for background status. Such a thread has the lowest priority and any disk I/O is throttled to minimize the impact on the system.
Available in iOS 4.3 and later.
Declared in dispatch/queue.h.

MT :

namespace MonoTouch.CoreFoundation
{
	public enum DispatchQueuePriority
	{
		High = 2,
		Default = 0,
		Low = -2
	}
}

Thanks in advance.

Paul Auman
Auman Software, LLC
Comment 1 Sebastien Pouliot 2014-03-05 09:47:18 UTC
The value is presently missing and will be added in a future maintenance release.

The immediate workaround is to use:

    ((DispatchQueuePriority) Int16.MinValue)

in your code.
Comment 2 Sebastien Pouliot 2014-03-05 10:17:42 UTC
Fixed in master 6a85bea04efa4a110e625843391a03fb6fa1a0ed
Comment 3 Paul Auman 2014-03-06 21:10:11 UTC
Thank you.

- Paul
Comment 4 Shruti 2014-03-21 02:38:30 UTC
I have verified this issue in monotouch.dll, DISPATCH_QUEUE_PRIORITY_BACKGROUND has been added.

Reference screenshot to verify : http://screencast.com/t/1k0wPHcqLw

Environment Info:
XS 4.2.4 (build 32) 
X.iOS 7.2.1.20


Hence, Closing this issue.