From d45c4a1f40c80d203b6ca8efc338a61d9232846e Mon Sep 17 00:00:00 2001
From: Ralf Habacker <ralf.habacker@freenet.de>
Date: Mon, 1 Jan 2007 21:29:59 +0000
Subject: * dbus/dbus-sysdeps-unix.c: unix compile fix, moved
 atomic_exchange_and_add() from dbus/dbus-sysdeps.c to here, it's used by
 _dbus_atomic_inc() and _dbus_atomic_dec().

---
 dbus/dbus-sysdeps-unix.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'dbus/dbus-sysdeps-unix.c')

diff --git a/dbus/dbus-sysdeps-unix.c b/dbus/dbus-sysdeps-unix.c
index 9b6457b2..26fa5f94 100644
--- a/dbus/dbus-sysdeps-unix.c
+++ b/dbus/dbus-sysdeps-unix.c
@@ -1428,6 +1428,24 @@ _dbus_getuid (void)
   return getuid ();
 }
 
+_DBUS_DEFINE_GLOBAL_LOCK (atomic);
+
+#ifdef DBUS_USE_ATOMIC_INT_486
+/* Taken from CVS version 1.7 of glibc's sysdeps/i386/i486/atomicity.h */
+/* Since the asm stuff here is gcc-specific we go ahead and use "inline" also */
+static inline dbus_int32_t
+atomic_exchange_and_add (DBusAtomic            *atomic,
+                         volatile dbus_int32_t  val)
+{
+  register dbus_int32_t result;
+
+  __asm__ __volatile__ ("lock; xaddl %0,%1"
+                        : "=r" (result), "=m" (atomic->value)
+			: "0" (val), "m" (atomic->value));
+  return result;
+}
+#endif
+
 /**
  * Atomically increments an integer
  *
-- 
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