diff options
Diffstat (limited to 'include/asm-i386/atomic.h')
| -rw-r--r-- | include/asm-i386/atomic.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h index 94a7ea264..a50b747cd 100644 --- a/include/asm-i386/atomic.h +++ b/include/asm-i386/atomic.h @@ -23,9 +23,33 @@ typedef struct { volatile int counter; } atomic_t; #define ATOMIC_INIT(i) { (i) } +/** + * atomic_read - read atomic variable + * @v: pointer of type atomic_t + * + * Atomically reads the value of @v. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ #define atomic_read(v) ((v)->counter) + +/** + * atomic_set - set atomic variable + * @v: pointer of type atomic_t + * @i: required value + * + * Atomically sets the value of @v to @i. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ #define atomic_set(v,i) (((v)->counter) = (i)) +/** + * atomic_add - add integer to atomic variable + * @i: integer value to add + * @v: pointer of type atomic_t + * + * Atomically adds @i to @v. Note that the guaranteed useful range + * of an atomic_t is only 24 bits. + */ static __inline__ void atomic_add(int i, atomic_t *v) { __asm__ __volatile__( @@ -34,6 +58,14 @@ static __inline__ void atomic_add(int i, atomic_t *v) :"ir" (i), "m" (v->counter)); } +/** + * atomic_sub - subtract the atomic variable + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically subtracts @i from @v. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ void atomic_sub(int i, atomic_t *v) { __asm__ __volatile__( @@ -42,6 +74,16 @@ static __inline__ void atomic_sub(int i, atomic_t *v) :"ir" (i), "m" (v->counter)); } +/** + * atomic_sub_and_test - test variable then subtract + * @i: integer value to subtract + * @v: pointer of type atomic_t + * + * Atomically subtracts @i from @v and returns + * true if the result is zero, or false for all + * other cases. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ int atomic_sub_and_test(int i, atomic_t *v) { unsigned char c; @@ -53,6 +95,13 @@ static __inline__ int atomic_sub_and_test(int i, atomic_t *v) return c; } +/** + * atomic_inc - increment atomic variable + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ void atomic_inc(atomic_t *v) { __asm__ __volatile__( @@ -61,6 +110,13 @@ static __inline__ void atomic_inc(atomic_t *v) :"m" (v->counter)); } +/** + * atomic_dec - decrement the atomic variable + * @v: pointer of type atomic_t + * + * Atomically decrements @v by 1. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ void atomic_dec(atomic_t *v) { __asm__ __volatile__( @@ -69,6 +125,15 @@ static __inline__ void atomic_dec(atomic_t *v) :"m" (v->counter)); } +/** + * atomic_dec_and_test - decrement by 1 and test + * @v: pointer of type atomic_t + * + * Atomically decrements @v by 1 and + * returns true if the result is 0, or false for all other + * cases. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ int atomic_dec_and_test(atomic_t *v) { unsigned char c; @@ -80,6 +145,15 @@ static __inline__ int atomic_dec_and_test(atomic_t *v) return c != 0; } +/** + * atomic_inc_and_test - increment by 1 and test + * @v: pointer of type atomic_t + * + * Atomically increments @v by 1 + * and returns true if the result is zero, or false for all + * other cases. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ int atomic_inc_and_test(atomic_t *v) { unsigned char c; @@ -91,6 +165,16 @@ static __inline__ int atomic_inc_and_test(atomic_t *v) return c != 0; } +/** + * atomic_add_negative - add and test if negative + * @v: pointer of type atomic_t + * @i: integer value to add + * + * Atomically adds @i to @v and returns true + * if the result is negative, or false when + * result is greater than or equal to zero. Note that the guaranteed + * useful range of an atomic_t is only 24 bits. + */ static __inline__ int atomic_add_negative(int i, atomic_t *v) { unsigned char c; |