From 70b33edae7c8b9c031b83c95f00cb383789f1041 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 10 Dec 2015 15:54:42 +0100
Subject: [PATCH] Add atomic ops for AIX

Patch from Volker Simonis.
---
 src/hb-atomic-private.hh | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/src/hb-atomic-private.hh b/src/hb-atomic-private.hh
index 8179571ad..b49f808ce 100644
--- a/src/hb-atomic-private.hh
+++ b/src/hb-atomic-private.hh
@@ -119,6 +119,31 @@ typedef unsigned int hb_atomic_int_impl_t;
 #define hb_atomic_ptr_impl_cmpexch(P,O,N)	( ({__machine_rw_barrier ();}), atomic_cas_ptr ((void **) (P), (void *) (O), (void *) (N)) == (void *) (O) ? true : false)
 
 
+#elif !defined(HB_NO_MT) && defined(_AIX)
+
+#include <builtins.h>
+
+
+static inline int hb_fetch_and_add(volatile int* AI, unsigned int V) {
+  __lwsync();
+  int result = __fetch_and_add(AI, V);
+  __isync();
+  return result;
+}
+static inline int hb_compare_and_swaplp(volatile long* P, long O, long N) {
+  __sync();
+  int result = __compare_and_swaplp (P, &O, N);
+  __sync();
+  return result;
+}
+
+typedef int hb_atomic_int_impl_t;
+#define HB_ATOMIC_INT_IMPL_INIT(V) (V)
+#define hb_atomic_int_impl_add(AI, V)           hb_fetch_and_add (&(AI), (V))
+
+#define hb_atomic_ptr_impl_get(P)               (__sync(), (void *) *(P))
+#define hb_atomic_ptr_impl_cmpexch(P,O,N)       hb_compare_and_swaplp ((long*)(P), (long)(O), (long)(N))
+
 #elif !defined(HB_NO_MT)
 
 #define HB_ATOMIC_INT_NIL 1 /* Warn that fallback implementation is in use. */