Merge pull request #5 from WinampDesktop/community

Merge to main

1 files changed, 48 insertions, 0 deletions

diff --git a/Src/replicant/nu/win-x86/LockFreeLIFO.c b/Src/replicant/nu/win-x86/LockFreeLIFO.c
new file mode 100644
index 00000000..ecffde9a
--- /dev/null
+++ b/Src/replicant/nu/win-x86/LockFreeLIFO.c
@@ -0,0 +1,48 @@
+#include "LockFreeLIFO.h"
+#include "foundation/atomics.h"
+
+/* win32 implementation */
+
+void lifo_init(lifo_t *lifo)
+{
+	lifo->head = 0;
+	lifo->aba = 0;
+}
+
+#if 0 // defined in LockFreeLIFO.asm
+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)
+{
+	lifo_t old_head, new_head;
+	do
+	{
+		old_head = *lifo;
+		if (!old_head.head)
+			return 0;
+
+		new_head.head = old_head.head->Next;
+		new_head.aba = old_head.aba+1;
+	} while (!nx_atomic_cmpxchg2(*(int64_t *)&old_head, *(int64_t *)&new_head, (volatile int64_t *)&lifo->head));
+	return (queue_node_t *)old_head.head;
+}
+#endif
+
+queue_node_t *lifo_malloc(size_t bytes)
+{
+	return _aligned_malloc(bytes, MEMORY_ALLOCATION_ALIGNMENT);
+}
+
+void lifo_free(queue_node_t *ptr)
+{
+	_aligned_free(ptr);
+}
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