For example, most processors allow programs to disable interrupts, putting off the execution of interrupt handlers, in order to protect critical sections of code.
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To avoid that you have to disable interrupts while accessing the data structure, in DOS or Linux .-- talk ) 06 : 15, 3 February 2015 ( UTC)
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Uniprocessor architectures have the option of using uninterruptable sequences of instructions using special instructions or instruction prefixes to disable interrupts temporarily but this technique does not work for multiprocessor shared-memory machines.
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On the Z80, if you execute DI ( disable interrupts ) followed by HALT ( wait for an interrupt ), the CPU will stay frozen waiting for an interrupt that cannot happen.
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CAS, and other atomic instructions, are sometimes thought to be unnecessary in uniprocessor systems, because the atomicity of any sequence of instructions can be achieved by disabling interrupts while executing it.
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If two tasks share data, each can gain exclusive access to variables either by disabling interrupts, locking the scheduler, using a semaphore, or preferably, using a mutual exclusion semaphore.
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That's why I was slightly surprised that they wait until the 2nd instruction to disable interrupts-I figure that leaves a 2 cycle interval in which, should an interrupt occur, it would be serviced by a garbage vector.
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Some old DOS programs that use a protected mode DOS extender and install their own interrupt handlers ( usually games ) use the CLI instruction in the handlers to disable interrupts and either POPF ( after a corresponding PUSHF ) or IRET ( which restores the flags from the stack as part of its effects ) to restore it.
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