mirror of
https://github.com/torvalds/linux.git
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1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
#ifndef __ASM_SH_ATOMIC_H
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#define __ASM_SH_ATOMIC_H
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/*
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* Atomic operations that C can't guarantee us. Useful for
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* resource counting etc..
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*
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*/
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typedef struct { volatile int counter; } atomic_t;
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#define ATOMIC_INIT(i) ( (atomic_t) { (i) } )
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#define atomic_read(v) ((v)->counter)
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#define atomic_set(v,i) ((v)->counter = (i))
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#include <asm/system.h>
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/*
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* To get proper branch prediction for the main line, we must branch
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* forward to code at the end of this object's .text section, then
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* branch back to restart the operation.
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*/
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static __inline__ void atomic_add(int i, atomic_t * v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v += i;
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local_irq_restore(flags);
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}
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static __inline__ void atomic_sub(int i, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v -= i;
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local_irq_restore(flags);
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}
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static __inline__ int atomic_add_return(int i, atomic_t * v)
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{
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unsigned long temp, flags;
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local_irq_save(flags);
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temp = *(long *)v;
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temp += i;
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*(long *)v = temp;
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local_irq_restore(flags);
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return temp;
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}
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#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
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static __inline__ int atomic_sub_return(int i, atomic_t * v)
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{
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unsigned long temp, flags;
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local_irq_save(flags);
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temp = *(long *)v;
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temp -= i;
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*(long *)v = temp;
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local_irq_restore(flags);
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return temp;
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}
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#define atomic_dec_return(v) atomic_sub_return(1,(v))
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#define atomic_inc_return(v) atomic_add_return(1,(v))
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/*
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* atomic_inc_and_test - increment and test
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* @v: pointer of type atomic_t
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*
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* Atomically increments @v by 1
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* and returns true if the result is zero, or false for all
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* other cases.
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*/
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#define atomic_inc_and_test(v) (atomic_inc_return(v) == 0)
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#define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0)
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#define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0)
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#define atomic_inc(v) atomic_add(1,(v))
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#define atomic_dec(v) atomic_sub(1,(v))
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static __inline__ void atomic_clear_mask(unsigned int mask, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v &= ~mask;
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local_irq_restore(flags);
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}
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static __inline__ void atomic_set_mask(unsigned int mask, atomic_t *v)
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{
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unsigned long flags;
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local_irq_save(flags);
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*(long *)v |= mask;
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local_irq_restore(flags);
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}
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/* Atomic operations are already serializing on SH */
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#define smp_mb__before_atomic_dec() barrier()
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#define smp_mb__after_atomic_dec() barrier()
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#define smp_mb__before_atomic_inc() barrier()
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#define smp_mb__after_atomic_inc() barrier()
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#endif /* __ASM_SH_ATOMIC_H */
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