From 8ca8d7665d671e10d72b8fcb4d69121d75f7906e Mon Sep 17 00:00:00 2001 From: Eric Biederman Date: Tue, 22 Apr 2003 19:02:15 +0000 Subject: - Initial checkin of the freebios2 tree git-svn-id: svn://svn.coreboot.org/coreboot/trunk@784 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- src/include/smp/atomic.h | 53 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 src/include/smp/atomic.h (limited to 'src/include/smp/atomic.h') diff --git a/src/include/smp/atomic.h b/src/include/smp/atomic.h new file mode 100644 index 0000000000..b36e0e2051 --- /dev/null +++ b/src/include/smp/atomic.h @@ -0,0 +1,53 @@ +#ifndef SMP_ATOMIC_H +#define SMP_ATOMIC_H + +#ifdef SMP +#include +#else + +typedef struct { 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_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. + */ +#define atomic_inc(v) (((v)->counter)++) + + +/** + * atomic_dec - decrement 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. + */ +#define atomic_dec(v) (((v)->counter)--) + + +#endif /* SMP */ + +#endif /* SMP_ATOMIC_H */ -- cgit v1.2.3