MINOR: thread: implement HA_ATOMIC_XADD()
We've been missing it several times and now we'll need it to increment
a request counter. Let's do it once for all.
This patch will need to be backported to 1.8 with the associated fix.
diff --git a/include/common/hathreads.h b/include/common/hathreads.h
index b53cd77..01b2181 100644
--- a/include/common/hathreads.h
+++ b/include/common/hathreads.h
@@ -47,6 +47,13 @@
#define HA_ATOMIC_CAS(val, old, new) ({((*val) == (*old)) ? (*(val) = (new) , 1) : (*(old) = *(val), 0);})
#define HA_ATOMIC_ADD(val, i) ({*(val) += (i);})
#define HA_ATOMIC_SUB(val, i) ({*(val) -= (i);})
+#define HA_ATOMIC_XADD(val, i) \
+ ({ \
+ typeof((val)) __p_xadd = (val); \
+ typeof(*(val)) __old_xadd = *__p_xadd; \
+ *__p_xadd += i; \
+ __old_xadd; \
+ })
#define HA_ATOMIC_AND(val, flags) ({*(val) &= (flags);})
#define HA_ATOMIC_OR(val, flags) ({*(val) |= (flags);})
#define HA_ATOMIC_XCHG(val, new) \
@@ -169,6 +176,7 @@
#define HA_ATOMIC_ADD(val, i) __sync_add_and_fetch(val, i)
#define HA_ATOMIC_SUB(val, i) __sync_sub_and_fetch(val, i)
+#define HA_ATOMIC_XADD(val, i) __sync_fetch_and_add(val, i)
#define HA_ATOMIC_AND(val, flags) __sync_and_and_fetch(val, flags)
#define HA_ATOMIC_OR(val, flags) __sync_or_and_fetch(val, flags)
@@ -230,6 +238,7 @@
/* gcc >= 4.7 */
#define HA_ATOMIC_CAS(val, old, new) __atomic_compare_exchange_n(val, old, new, 0, 0, 0)
#define HA_ATOMIC_ADD(val, i) __atomic_add_fetch(val, i, 0)
+#define HA_ATOMIC_XADD(val, i) __atomic_fetch_add(val, i, 0)
#define HA_ATOMIC_SUB(val, i) __atomic_sub_fetch(val, i, 0)
#define HA_ATOMIC_AND(val, flags) __atomic_and_fetch(val, flags, 0)
#define HA_ATOMIC_OR(val, flags) __atomic_or_fetch(val, flags, 0)