RE: Question on threads running in my Foundation tool
RE: Question on threads running in my Foundation tool
- Subject: RE: Question on threads running in my Foundation tool
- From: Josh Freeman <email@hidden>
- Date: Mon, 23 Feb 2009 00:54:15 -0500
Hi,
On Feb 22, 2009, at 9:35 AM, Charles E. Heizer wrote:
The issue I'm seeing is that for every time I call NSThread so not
to block the run loop it runs it's course but when it completes it
leaves a hanging thread. So every 60 seconds I see an additional
thread get added and never drops it once completed.
...
-(void)runSoftwareUpdate
{
NSTask *task;
task = [[NSTask alloc] init];
[task setLaunchPath: @"/usr/sbin/softwareupdate"];
NSArray *arguments;
arguments = [NSArray arrayWithObjects: @"-l", nil];
[task setArguments: arguments];
NSPipe *pipe;
pipe = [NSPipe pipe];
[task setStandardOutput: pipe];
NSFileHandle *file;
file = [pipe fileHandleForReading];
[task launch];
NSData *data;
data = [file readDataToEndOfFile];
NSString *string;
string = [[NSString alloc] initWithData: data encoding:
NSUTF8StringEncoding];
NSLog (@"Got a result \n%@", string);
}
Could the hanging thread be due to the alloc'd NSTask not being
released?
<shameless self-plug>
You might be interested in checking out the source code to an
open-source app I wrote, DAA Converter; It's a Cocoa wrapper for a
3rd-party command-line tool.
The sources contain (hopefully helpful) examples for both ways of
using NSTask - asynchronously & synchronously (the latter for when
the task will exit very quickly). There's no explicit use of
NSThread, NSRunLoop, or NSAutoreleasePool, since the NSTasks are
created by the main thread.
DAA Converter's sources are the bottom of the app's page:
http://www.twilightedge.com/mac/daaconverter
The NSTask code is found in DAAC_ConversionTask.m (async begins
in the 'beginDAA2ISOTaskWithDAAFile:ISOFile:' method, sync begins &
ends in the 'daa2isoCredits' method).
Cheers,
Josh
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