I apologize if this has been discussed before. It seems familiar but
I've slept too many time since.
Apparently there is some interest in Fedora for building OpenImageIO
for PPC architectures and a patch was created to get oiio 1.0.X to
build on PPC Linux (32bit I'm assuming).
I'll post the patch at the bottom but the interesting hunk in thread.h is:
@@ -272,6 +272,11 @@
#elif defined(_WIN32)
// Windows
return _InterlockedExchangeAdd ((volatile LONG *)at, x);
+#elif defined (__PPC__)
+ long long r;
+ r = *at;
+ *at += x;
+ return r;
#else
# error No atomics on this platform.
#endif
I seem to remember someone telling me this is essentially faking
atomics for PPC? Does PPC not have atomics?
The reason I ask is that the patch is not applying in 1.1.2 so I
figured I'd ask for some guidence here instead of doing a hack on the
existing patch.
Thanks,
Richard
Here's the whole patch:
diff -Naur OpenImageIO-oiio-2939154.orig/src/include/thread.h
OpenImageIO-oiio-2939154/src/include/thread.h
--- OpenImageIO-oiio-2939154.orig/src/include/thread.h 2012-06-04
12:30:16.000000000 -0500
+++ OpenImageIO-oiio-2939154/src/include/thread.h 2012-06-13
15:14:36.648990016 -0500
@@ -103,7 +103,7 @@
#endif
#if defined(__GNUC__) && (defined(_GLIBCXX_ATOMIC_BUILTINS) ||
(__GNUC__ * 100 + __GNUC_MINOR__ >= 401))
-#if !defined(__FreeBSD__) || defined(__x86_64__)
+#if !defined(__FreeBSD__) && !defined(__PPC__) || defined(__x86_64__)
#define USE_GCC_ATOMICS
#endif
#endif
@@ -272,6 +272,11 @@
#elif defined(_WIN32)
// Windows
return _InterlockedExchangeAdd ((volatile LONG *)at, x);
+#elif defined (__PPC__)
+ long long r;
+ r = *at;
+ *at += x;
+ return r;
#else
# error No atomics on this platform.
#endif
@@ -297,6 +302,11 @@
# else
return InterlockedExchangeAdd64 ((volatile LONGLONG *)at, x);
# endif
+#elif defined (__PPC__)
+ long long r;
+ r = *at;
+ *at += x;
+ return r;
#else
# error No atomics on this platform.
#endif
@@ -322,6 +332,8 @@
return OSAtomicCompareAndSwap32Barrier (compareval, newval, at);
#elif defined(_WIN32)
return (_InterlockedCompareExchange ((volatile LONG *)at, newval,
compareval) == compareval);
+#elif defined(__PPC__)
+ return ((*at == compareval) ? (*at = newval), 1 : 0);
#else
# error No atomics on this platform.
#endif
@@ -341,6 +353,8 @@
return OSAtomicCompareAndSwap64Barrier (compareval, newval, at);
#elif defined(_WIN32)
return (_InterlockedCompareExchange64 ((volatile LONGLONG *)at,
newval, compareval) == compareval);
+#elif defined(__PPC__)
+ return ((*at == compareval) ? (*at = newval), 1 : 0);
#else
# error No atomics on this platform.
#endif
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