Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 61 insertions, 0 deletions

diff --git a/Src/replicant/nu/LockFreeLIFO.c b/Src/replicant/nu/LockFreeLIFO.c
new file mode 100644
index 00000000..eb9c1eb1
--- /dev/null
+++ b/Src/replicant/nu/LockFreeLIFO.c
@@ -0,0 +1,61 @@
+#include "LockFreeLIFO.h"
+#include "foundation/atomics.h"
+
+/* TODO: on windows, replace with InitializeSListHead/InterlockedPushEntrySList/InterlockedPopEntrySList just to be safe */
+void lifo_init(lifo_t *lifo)
+{
+	lifo->head = 0;
+}
+
+void lifo_push(lifo_t *lifo, queue_node_t *cl)
+{
+	queue_node_t *new_head = cl;
+	queue_node_t *old_head = 0;
+	do
+	{
+		old_head = (queue_node_t *)lifo->head;
+		new_head->Next = old_head;
+	} while (!nx_atomic_cmpxchg_pointer(old_head, new_head, (void * volatile *)&lifo->head));
+}
+
+queue_node_t *lifo_pop(lifo_t *lifo)
+{
+	queue_node_t *new_head = 0, *old_head = 0;
+	do
+	{
+		old_head = (queue_node_t *)lifo->head;
+		if (old_head)
+			new_head = old_head->Next;
+		else
+			new_head = 0;
+	} while (!nx_atomic_cmpxchg_pointer(old_head, new_head, (void * volatile *)&lifo->head));
+	return old_head;
+}
+
+	queue_node_t *lifo_malloc(size_t bytes)
+	{
+#ifdef __GNUC__
+#   ifdef __APPLE__
+		void *v = 0;
+		(void) posix_memalign(&v, sizeof(void *), bytes);
+		return v;
+#   else
+		return memalign(bytes, sizeof(void *));
+#   endif
+#elif defined(_WIN32)
+		return _aligned_malloc(bytes, MEMORY_ALLOCATION_ALIGNMENT);
+#else
+#error port me!
+#endif
+	}
+
+	void lifo_free(queue_node_t *ptr)
+	{
+#ifdef __GNUC__
+		free(ptr);
+#elif defined(_WIN32)
+		_aligned_free(ptr);
+#else
+#error port me!
+#endif
+	}