From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
To: linux-kernel@vger.kernel.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Subject: [PATCH 01/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to alpha
Date: Sun, 11 Feb 2007 14:17:39 -0500 [thread overview]
Message-ID: <1171221468451-git-send-email-mathieu.desnoyers@polymtl.ca> (raw)
In-Reply-To: <11712214684187-git-send-email-mathieu.desnoyers@polymtl.ca>
atomic.h : Add atomic64 cmpxchg, xchg and add_unless to alpha
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
--- a/include/asm-alpha/atomic.h
+++ b/include/asm-alpha/atomic.h
@@ -175,19 +175,62 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
return result;
}
-#define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic64_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
+#define atomic64_xchg(v, new) (xchg(&((v)->counter), new))
+
+#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+/**
+ * atomic_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
#define atomic_add_unless(v, a, u) \
({ \
- int c, old; \
+ __typeof__((v)->counter) c, old; \
c = atomic_read(v); \
- while (c != (u) && (old = atomic_cmpxchg((v), c, c + (a))) != c) \
+ for (;;) { \
+ if (unlikely(c == (u))) \
+ break; \
+ old = atomic_cmpxchg((v), c, c + (a)); \
+ if (likely(old == c)) \
+ break; \
c = old; \
+ } \
c != (u); \
})
#define atomic_inc_not_zero(v) atomic_add_unless((v), 1, 0)
+/**
+ * atomic64_add_unless - add unless the number is a given value
+ * @v: pointer of type atomic64_t
+ * @a: the amount to add to v...
+ * @u: ...unless v is equal to u.
+ *
+ * Atomically adds @a to @v, so long as it was not @u.
+ * Returns non-zero if @v was not @u, and zero otherwise.
+ */
+#define atomic64_add_unless(v, a, u) \
+({ \
+ __typeof__((v)->counter) c, old; \
+ c = atomic64_read(v); \
+ for (;;) { \
+ if (unlikely(c == (u))) \
+ break; \
+ old = atomic64_cmpxchg((v), c, c + (a)); \
+ if (likely(old == c)) \
+ break; \
+ c = old; \
+ } \
+ c != (u); \
+})
+#define atomic64_inc_not_zero(v) atomic64_add_unless((v), 1, 0)
+
#define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0)
#define atomic64_add_negative(a, v) (atomic64_add_return((a), (v)) < 0)
next prev parent reply other threads:[~2007-02-11 19:17 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-11 19:17 [PATCH 00/10] atomic.h : standardizing atomic primitives Mathieu Desnoyers
2007-02-11 19:17 ` Mathieu Desnoyers [this message]
2007-02-11 19:17 ` [PATCH 02/10] atomic.h : Complete atomic_long operations in asm-generic Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 03/10] atomic.h : i386 type safety fix Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 04/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to ia64 Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 05/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to mips Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 06/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to parisc Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 07/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to powerpc Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 08/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to sparc64 Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 09/10] atomic.h : Add atomic64_xchg to s390 Mathieu Desnoyers
2007-02-11 19:17 ` [PATCH 10/10] atomic.h : Add atomic64 cmpxchg, xchg and add_unless to x86_64 Mathieu Desnoyers
2007-02-12 11:35 ` Andi Kleen
2007-02-12 16:43 ` Mathieu Desnoyers
2007-02-12 16:49 ` [PATCH] atomic.h : atomic_add_unless as inline. Remove system.h atomic.h circular dependency Mathieu Desnoyers
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