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Date: Mon, 22 Feb 2016 21:14:23 -0600
From: Bobby Bingham <koorogi@...rogi.info>
To: musl@...ts.openwall.com
Subject: [PATCH] allow implementing a_cas_p with pointer-sized ll/sc
No current ports do this, but it will be useful for porting to 64-bit ll/sc
architectures, such as mips64 and powerpc64.
---
src/internal/atomic.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/src/internal/atomic.h b/src/internal/atomic.h
index 2097247..6f37d25 100644
--- a/src/internal/atomic.h
+++ b/src/internal/atomic.h
@@ -82,6 +82,23 @@ static inline int a_fetch_or(volatile int *p, int v)
#endif
+#ifdef a_ll_p
+
+#ifndef a_cas_p
+#define a_cas_p a_cas_p
+static inline void *a_cas_p(volatile void *p, void *t, void *s)
+{
+ void *old;
+ a_pre_llsc();
+ do old = a_ll_p(p);
+ while (old==t && !a_sc_p(p, s));
+ a_post_llsc();
+ return old;
+}
+#endif
+
+#endif
+
#ifndef a_cas
#error missing definition of a_cas
#endif
@@ -209,6 +226,7 @@ static inline void a_or_64(volatile uint64_t *p, uint64_t v)
#endif
#ifndef a_cas_p
+typedef char a_cas_p_undefined_but_pointer_not_32bit[-sizeof(char) == 0xffffffff ? 1 : -1];
#define a_cas_p a_cas_p
static inline void *a_cas_p(volatile void *p, void *t, void *s)
{
--
2.7.1
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