1 files changed, 97 insertions, 0 deletions
diff --git a/lib/nghttp3_tnode.c b/lib/nghttp3_tnode.c
new file mode 100644
index 0000000..2fe7f3f
--- /dev/null
+++ b/lib/nghttp3_tnode.c
@@ -0,0 +1,97 @@
+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#include "nghttp3_tnode.h"
+
+#include <assert.h>
+
+#include "nghttp3_macro.h"
+#include "nghttp3_stream.h"
+#include "nghttp3_conn.h"
+#include "nghttp3_conv.h"
+
+void nghttp3_tnode_init(nghttp3_tnode *tnode, int64_t id, uint8_t pri) {
+  assert(nghttp3_pri_uint8_urgency(pri) < NGHTTP3_URGENCY_LEVELS);
+
+  tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
+  tnode->id = id;
+  tnode->cycle = 0;
+  tnode->pri = pri;
+}
+
+void nghttp3_tnode_free(nghttp3_tnode *tnode) { (void)tnode; }
+
+static void tnode_unschedule(nghttp3_tnode *tnode, nghttp3_pq *pq) {
+  assert(tnode->pe.index != NGHTTP3_PQ_BAD_INDEX);
+
+  nghttp3_pq_remove(pq, &tnode->pe);
+  tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
+}
+
+void nghttp3_tnode_unschedule(nghttp3_tnode *tnode, nghttp3_pq *pq) {
+  if (tnode->pe.index == NGHTTP3_PQ_BAD_INDEX) {
+    return;
+  }
+
+  tnode_unschedule(tnode, pq);
+}
+
+static uint64_t pq_get_first_cycle(nghttp3_pq *pq) {
+  nghttp3_tnode *top;
+
+  if (nghttp3_pq_empty(pq)) {
+    return 0;
+  }
+
+  top = nghttp3_struct_of(nghttp3_pq_top(pq), nghttp3_tnode, pe);
+  return top->cycle;
+}
+
+int nghttp3_tnode_schedule(nghttp3_tnode *tnode, nghttp3_pq *pq,
+                           uint64_t nwrite) {
+  uint64_t penalty = nwrite / NGHTTP3_STREAM_MIN_WRITELEN;
+
+  if (tnode->pe.index == NGHTTP3_PQ_BAD_INDEX) {
+    tnode->cycle = pq_get_first_cycle(pq) +
+                   ((nwrite == 0 || !nghttp3_pri_uint8_inc(tnode->pri))
+                        ? 0
+                        : nghttp3_max(1, penalty));
+  } else if (nwrite > 0) {
+    if (!nghttp3_pri_uint8_inc(tnode->pri) || nghttp3_pq_size(pq) == 1) {
+      return 0;
+    }
+
+    nghttp3_pq_remove(pq, &tnode->pe);
+    tnode->pe.index = NGHTTP3_PQ_BAD_INDEX;
+    tnode->cycle += nghttp3_max(1, penalty);
+  } else {
+    return 0;
+  }
+
+  return nghttp3_pq_push(pq, &tnode->pe);
+}
+
+int nghttp3_tnode_is_scheduled(nghttp3_tnode *tnode) {
+  return tnode->pe.index != NGHTTP3_PQ_BAD_INDEX;
+}