[bug #48179] GSRegisterCurrentThread should send NSWillBecomeMultiThreadedNotification

[Larry Campbell]

Follow-up Comment #1, bug #48179 (project gnustep):

Note that this should be done only if called from a non-main thread. Note also
that the comment in front of the implementation of GSRegisterCurrentThread()
says:

 *   Sends out a <code>NSWillBecomeMultiThreadedNotification</code>           
                                                     
 *   if the process was not already multithreaded.                            
                                                     

which is not actually true (the patch below makes the comment true).

The following patch works for me:

***
/home/lcampbel/dev/mc7883/akamai/gnustep-base/gnustep-base-1.24.8/Source/NSThread.m
     2016-06-08
13:13:07.000000000 -0400
--- ./NSThread.m        2016-06-08 14:08:17.000000000 -0400
***************
*** 591,596 ****
--- 591,598 ----
        [[NSGarbageCollector defaultCollector] disableCollectorForPointer:
t];
        pthread_setspecific(thread_object_key, t);
        GS_CONSUMED(t);
+       if (defaultThread != nil && t != defaultThread)
+         gnustep_base_thread_callback();
        return YES;
      }
    return NO;


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