Use GCC built-in functions for atomic operations.

1 files changed, 97 insertions, 0 deletions

diff --git a/iatomic.h b/iatomic.h
new file mode 100644
index 0000000..59e1684
--- /dev/null
+++ b/iatomic.h
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+///
+///	@file iatomic.h @brief Misc function header file
+///
+///	Copyright (c) 2014 by Johns.  All Rights Reserved.
+///
+///	Contributor(s):
+///
+///	License: AGPLv3
+///
+///	This program is free software: you can redistribute it and/or modify
+///	it under the terms of the GNU Affero General Public License as
+///	published by the Free Software Foundation, either version 3 of the
+///	License.
+///
+///	This program is distributed in the hope that it will be useful,
+///	but WITHOUT ANY WARRANTY; without even the implied warranty of
+///	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+///	GNU Affero General Public License for more details.
+///
+///	$Id$
+//////////////////////////////////////////////////////////////////////////////
+
+/// @addtogroup iatomic
+/// @{
+
+#define GCC_VERSION (__GNUC__ * 10000 \
+	+ __GNUC_MINOR__ * 100 \
+	+ __GNUC_PATCHLEVEL__)
+
+//	gcc before 4.7 didn't support atomic builtins,
+//	use alsa atomic functions.
+#if GCC_VERSION < 40700
+
+#include <alsa/iatomic.h>
+
+#else
+
+//////////////////////////////////////////////////////////////////////////////
+//	Defines
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//	Declares
+//////////////////////////////////////////////////////////////////////////////
+
+///
+///	atomic type, 24 bit useable,
+///
+typedef volatile int atomic_t;
+
+//////////////////////////////////////////////////////////////////////////////
+//	Prototypes
+//////////////////////////////////////////////////////////////////////////////
+
+//////////////////////////////////////////////////////////////////////////////
+//	Inlines
+//////////////////////////////////////////////////////////////////////////////
+
+///
+///	Set atomic value.
+///
+#define atomic_set(ptr, val) \
+    __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST)
+
+///
+///	Read atomic value.
+///
+#define atomic_read(ptr) \
+    __atomic_load_n(ptr, __ATOMIC_SEQ_CST)
+
+///
+///	Increment atomic value.
+///
+#define atomic_inc(ptr) \
+    __atomic_add_fetch(ptr, 1, __ATOMIC_SEQ_CST)
+
+///
+///	Decrement atomic value.
+///
+#define atomic_dec(ptr) \
+    __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)
+
+///
+///	Add to atomic value.
+///
+#define atomic_add(val, ptr) \
+    __atomic_add_fetch(ptr, val, __ATOMIC_SEQ_CST)
+
+///
+///	Subtract from atomic value.
+///
+#define atomic_sub(val, ptr) \
+    __atomic_sub_fetch(ptr, val, __ATOMIC_SEQ_CST)
+
+#endif
+
+/// @}