--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/gc/orchestrate.h	Tue May 08 16:09:12 2018 +0900
@@ -0,0 +1,63 @@
+void MVM_gc_enter_from_allocator(MVMThreadContext *tc);
+void MVM_gc_enter_from_interrupt(MVMThreadContext *tc);
+MVM_PUBLIC void MVM_gc_mark_thread_blocked(MVMThreadContext *tc);
+MVM_PUBLIC void MVM_gc_mark_thread_unblocked(MVMThreadContext *tc);
+MVM_PUBLIC MVMint32 MVM_gc_is_thread_blocked(MVMThreadContext *tc);
+void MVM_gc_global_destruction(MVMThreadContext *tc);
+
+struct MVMWorkThread {
+    MVMThreadContext *tc;
+    void             *limit;
+};
+
+typedef enum {
+    MVM_GC_DEBUG_ORCHESTRATE = 1,
+    MVM_GC_DEBUG_COLLECT = 2,
+/*    MVM_GC_DEBUG_ = 4,
+    MVM_GC_DEBUG_ = 8,
+    MVM_GC_DEBUG_ = 16,
+    MVM_GC_DEBUG_ = 32,
+    MVM_GC_DEBUG_ = 64,
+    MVM_GC_DEBUG_ = 128,
+    MVM_GC_DEBUG_ = 256,
+    MVM_GC_DEBUG_ = 512,
+    MVM_GC_DEBUG_ = 1024,
+    MVM_GC_DEBUG_ = 2048,
+    MVM_GC_DEBUG_ = 4096,
+    MVM_GC_DEBUG_ = 8192,
+    MVM_GC_DEBUG_ = 16384,
+    MVM_GC_DEBUG_ = 32768,
+    MVM_GC_DEBUG_ = 65536,
+    MVM_GC_DEBUG_ = 131072,
+    MVM_GC_DEBUG_ = 262144,
+    MVM_GC_DEBUG_ = 524288,
+    MVM_GC_DEBUG_ = 1048576,
+    MVM_GC_DEBUG_ = 2097152,
+    MVM_GC_DEBUG_ = 4194304,
+    MVM_GC_DEBUG_ = 8388608,
+    MVM_GC_DEBUG_ = 16777216,
+    MVM_GC_DEBUG_ = 33554432,
+    MVM_GC_DEBUG_ = 67108864,
+    MVM_GC_DEBUG_ = 134217728*/
+} MVMGCDebugLogFlags;
+
+/* OR together the flags you want to require, or redefine
+ * MVM_GC_DEBUG_ENABLED(flags) if you want something more
+ * complicated. */
+#define MVM_GC_DEBUG_LOG_FLAGS \
+    0
+
+#define MVM_GC_DEBUG_ENABLED(flags) \
+    ((MVM_GC_DEBUG_LOG_FLAGS) & (flags))
+
+#ifdef _MSC_VER
+# define GCDEBUG_LOG(tc, flags, msg, ...) \
+    if (MVM_GC_DEBUG_ENABLED(flags)) \
+        printf((msg), (tc)->thread_id, \
+            MVM_load(&(tc)->instance->gc_seq_number), __VA_ARGS__)
+#else
+# define GCDEBUG_LOG(tc, flags, msg, ...) \
+    if (MVM_GC_DEBUG_ENABLED(flags)) \
+        printf((msg), (tc)->thread_id, \
+            (int)MVM_load(&(tc)->instance->gc_seq_number) , ##__VA_ARGS__)
+#endif