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Problem 1:
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Given the two threads below:

	void *thread_a(void *arg)
	{
	  printf("Thread A: before synchronization\n");
	
	  <SYNCH_POINT>
	
	  printf("Thread A: after synchronization\n");
	}
	
	void *thread_b(void *arg)
	{
	  printf("Thread B: before synchronization\n");
	
	  <SYNCH_POINT>
	
	  printf("Thread B: after synchronization\n");
	}


write the code for the <SYNCH_POINT>, so that:

"Thread A: after synchronization" is always printed *after* "Thread B: before synchronization",  

*and* 

"Thread B: after synchronization" is always printed *after* "Thread A: before synchronization".

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Problem 2:
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Given N threads, with the following code 

	void *thread(void *arg)
	{
          int index = *((int *)arg);
	  printf("Thread %d: before synchronization\n", index);
	
	  <SYNCH_POINT>
	
	  printf("Thread %d: after synchronization\n", index);
	}
		
write the code for the <SYNCH_POINT>, so that all "Thread x: before synchronization" 
are printed before all "Thread x: after synchronization"

N is arbitrary.