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This commit is contained in:
Nils O. Selåsdal
2013-06-19 18:47:45 +02:00
parent b219136d6e
commit e03b9a9f80
1 changed files with 7 additions and 4 deletions
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include/ucore/atomic.h
+7 -4
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@@ -1,8 +1,12 @@
#ifndef UC_ATOMIC_H_ #ifndef UC_ATOMIC_H_
#define UC_ATOMIC_H_ #define UC_ATOMIC_H_
#ifdef __GNUC__ /** Atomic functions (macros). The ptr argument must be a pointer to
* an integer type.
* For gcc, see http://gcc.gnu.org/onlinedocs/gcc-4.8.1/gcc/_005f_005fsync-Builtins.html
*/
#ifdef __GNUC__
/** /**
* Atomically add val to *ptr * Atomically add val to *ptr
@@ -11,7 +15,7 @@
#define UC_ATOMIC_ADD(ptr, val) __sync_fetch_and_add((ptr), (val)) #define UC_ATOMIC_ADD(ptr, val) __sync_fetch_and_add((ptr), (val))
/** /**
* Atomically subtract val to *ptr * Atomically subtract val from *ptr
* @return *ptr before the subtraction * @return *ptr before the subtraction
*/ */
#define UC_ATOMIC_SUB(ptr, val) __sync_fetch_and_add((ptr), -(val)) #define UC_ATOMIC_SUB(ptr, val) __sync_fetch_and_add((ptr), -(val))
@@ -30,8 +34,7 @@
/** /**
* UC_ATOMIC_CAS(p, 12, * Atomic Compare-And-Swap. If *ptr is oldval, write newwal to *ptr.
* Compare-And-Swap. If *ptr is oldval, write newwal to *ptr.
* @return *ptr that was before the operation. * @return *ptr that was before the operation.
*/ */
#define UC_ATOMIC_CAS(ptr, oldval, newval) __sync_val_compare_and_swap((ptr), (oldval), (newval)) #define UC_ATOMIC_CAS(ptr, oldval, newval) __sync_val_compare_and_swap((ptr), (oldval), (newval))