Mercurial > libjeffpc
changeset 697:07966e8f9ed3
atomic: add atomic_cas_ptr to atomically swap an ordinary pointer
The normal cas macro assumes we are operating on an atomic_t.
Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
| author | Josef 'Jeff' Sipek <jeffpc@josefsipek.net> |
|---|---|
| date | Sun, 17 Mar 2019 09:56:12 -0400 |
| parents | 03eeee76f646 |
| children | 6a94380509f8 |
| files | include/jeffpc/atomic.h |
| diffstat | 1 files changed, 4 insertions(+), 3 deletions(-) [+] |
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--- a/include/jeffpc/atomic.h Tue Mar 12 21:08:50 2019 -0400 +++ b/include/jeffpc/atomic.h Sun Mar 17 09:56:12 2019 -0400 @@ -1,5 +1,5 @@ /* - * Copyright (c) 2014-2018 Josef 'Jeff' Sipek <jeffpc@josefsipek.net> + * Copyright (c) 2014-2019 Josef 'Jeff' Sipek <jeffpc@josefsipek.net> * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal @@ -47,8 +47,9 @@ #define atomic_inc(var) atomic_add((var), 1) #define atomic_dec(var) atomic_sub((var), 1) #define atomic_cas(var, old, new) \ - __sync_val_compare_and_swap(&(var)->v, \ - (old), (new)) + __sync_val_compare_and_swap(&(var)->v, (old), (new)) +#define atomic_cas_ptr(var, old, new) \ + __sync_val_compare_and_swap((var), (old), (new)) #define ATOMIC_INITIALIZER(val) { .v = (val) }