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authorPaolo Bonzini <pbonzini@redhat.com>2017-09-21 14:44:08 +0200
committerPaolo Bonzini <pbonzini@redhat.com>2017-09-21 14:47:42 +0200
commitdb81b9953761cac71906728fb3dfefce661ab903 (patch)
tree3d3d2522542db388e07575f9246dd00fba706d77 /docs/devel
parent05e015f73c3b5c50c237d3d8e555e25cfa543a5c (diff)
atomic: update documentation
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'docs/devel')
-rw-r--r--docs/devel/atomics.txt13
1 files changed, 12 insertions, 1 deletions
diff --git a/docs/devel/atomics.txt b/docs/devel/atomics.txt
index 3ef5d85b1b..048e5f23cb 100644
--- a/docs/devel/atomics.txt
+++ b/docs/devel/atomics.txt
@@ -63,11 +63,22 @@ operations:
typeof(*ptr) atomic_fetch_sub(ptr, val)
typeof(*ptr) atomic_fetch_and(ptr, val)
typeof(*ptr) atomic_fetch_or(ptr, val)
+ typeof(*ptr) atomic_fetch_xor(ptr, val)
typeof(*ptr) atomic_xchg(ptr, val)
typeof(*ptr) atomic_cmpxchg(ptr, old, new)
all of which return the old value of *ptr. These operations are
-polymorphic; they operate on any type that is as wide as an int.
+polymorphic; they operate on any type that is as wide as a pointer.
+
+Similar operations return the new value of *ptr:
+
+ typeof(*ptr) atomic_inc_fetch(ptr)
+ typeof(*ptr) atomic_dec_fetch(ptr)
+ typeof(*ptr) atomic_add_fetch(ptr, val)
+ typeof(*ptr) atomic_sub_fetch(ptr, val)
+ typeof(*ptr) atomic_and_fetch(ptr, val)
+ typeof(*ptr) atomic_or_fetch(ptr, val)
+ typeof(*ptr) atomic_xor_fetch(ptr, val)
Sequentially consistent loads and stores can be done using: