linux.conf.au, January 2003
      PRINCIPLES: Race Conditions

Race conditions when a process is preempted:

  	lwz 9,0(3)	# Load contents of R3 + 0 into R9
 	 	***** PROCESS 1 KICKED OFF CPU.  PROCESS 2: *****
 	 	...
 	 	lwz 9,0(3)	# Load contents of R3 + 0 into R9
 	 	addi 9,9,1	# Add one to R9
 	 	stw 9,0(3)	# Put contents of R9 back into R3 + 0
 	 	...
 	 	***** PROCESS 1 RETURNS TO CPU *****
  	addi 9,9,1	# Add one to R9
  	stw 9,0(3)	# Put contents of R9 back into R3 + 0