[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

starting cocoa in different thread

Subject: starting cocoa in different thread
From: Robert Nikander <email@hidden>
Date: Thu, 25 Oct 2007 14:23:54 -0400
Delivered-to: email@hidden
Delivered-to: email@hidden

Hi,

For reasons I won't go into (unless you are interested) I want to start Cocoa on a thread that is not the main posix thread. I wrote the small test program below that creates a little window with a button in it. There is a variable 'BOOL use_thread' in the main function. If it is 'NO', then the program runs fine -- I can can click the button, see that events are being generated. If use_thread = YES, then it doesn't work -- sendEvent: gets called constantly with null NSEvent pointers.

I thought I would be able to use any pthread as the "main" Cocoa event thread, as long as that thread called [NSApplication sharedApplication], set up the UI, and called [NSApp run]. Is that possible? If so, how?

thank you,
Rob

file: two_threads.m
compiled with: gcc -o two_threads two_threads.m -framework Cocoa

#import <Foundation/Foundation.h>
#import <AppKit/AppKit.h>

#include <pthread.h>

static int eventCount = 0;

@interface MyApp : NSApplication
@end

@implementation MyApp
{
}
- (void)sendEvent:(NSEvent*)e
{
    printf("MyApp.sendEvent: %p %d %s\n",
           e, ++eventCount,
           [[e description] UTF8String]);
    [super sendEvent: e];
}
@end

static void multithread_cocoa() { // Put Cocoa into multithreaded mode by starting an NSThread that does nothing. id obj = [[NSObject alloc] init]; SEL m = @selector(isEqual:); [NSThread detachNewThreadSelector:m toTarget:obj withObject:obj]; }

void *run_cocoa(void *ig)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSApplication *app = [MyApp sharedApplication];

id window = [[NSWindow alloc] initWithContentRect: NSMakeRect (10,10,100,100) styleMask: NSTitledWindowMask | NSResizableWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask backing: NSBackingStoreBuffered defer: NO]; [window makeKeyAndOrderFront: window];

    id b = [NSButton new];
    [b setTitle: @"Hi"];
    NSRect r = NSMakeRect(0,0,100,100);
    [b setFrame: r];
    [[window contentView] addSubview: b];

    [app run];
    [pool release];
}

int main(int argc, char **argv)
{
    BOOL use_thread = YES;

    if (use_thread)
    {
        multithread_cocoa();
        pthread_t t;
        pthread_create(&t, NULL, run_cocoa, NULL);
        pthread_join(t, NULL);
    }
    else
    {
        run_cocoa(NULL);
    }
    return 0;
}

_______________________________________________

Cocoa-dev mailing list (email@hidden)

Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com

Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/email@hidden

This email sent to email@hidden

Follow-Ups:
- Re: starting cocoa in different thread
  - From: glenn andreas <email@hidden>

Prev by Date: Re: problem with NSString, UTF8, pathnames
Next by Date: Binding popup button to User Defaults 'sometimes' doesn't work
Previous by thread: Re: problem with NSString, UTF8, pathnames
Next by thread: Re: starting cocoa in different thread
Index(es):
- Date
- Thread

Home