Initial checkin of gRPC to third_party/

third_party/grpc/src/core/transport/chttp2/stream_lists.c

Index: third_party/grpc/src/core/transport/chttp2/stream_lists.c
diff --git a/third_party/grpc/src/core/transport/chttp2/stream_lists.c b/third_party/grpc/src/core/transport/chttp2/stream_lists.c
new file mode 100644
index 0000000000000000000000000000000000000000..60fe735cfce9aa7327c5b90267154321780056d2
--- /dev/null
+++ b/third_party/grpc/src/core/transport/chttp2/stream_lists.c
@@ -0,0 +1,442 @@
+/*
+ *
+ * Copyright 2015-2016, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include "src/core/transport/chttp2/internal.h"
+
+#include <grpc/support/log.h>
+
+#define TRANSPORT_FROM_GLOBAL(tg)                                         \
+  ((grpc_chttp2_transport *)((char *)(tg)-offsetof(grpc_chttp2_transport, \
+                                                   global)))
+
+#define STREAM_FROM_GLOBAL(sg) \
+  ((grpc_chttp2_stream *)((char *)(sg)-offsetof(grpc_chttp2_stream, global)))
+
+#define TRANSPORT_FROM_WRITING(tw)                                        \
+  ((grpc_chttp2_transport *)((char *)(tw)-offsetof(grpc_chttp2_transport, \
+                                                   writing)))
+
+#define STREAM_FROM_WRITING(sw) \
+  ((grpc_chttp2_stream *)((char *)(sw)-offsetof(grpc_chttp2_stream, writing)))
+
+#define TRANSPORT_FROM_PARSING(tp)                                        \
+  ((grpc_chttp2_transport *)((char *)(tp)-offsetof(grpc_chttp2_transport, \
+                                                   parsing)))
+
+#define STREAM_FROM_PARSING(sp) \
+  ((grpc_chttp2_stream *)((char *)(sp)-offsetof(grpc_chttp2_stream, parsing)))
+
+/* core list management */
+
+static int stream_list_empty(grpc_chttp2_transport *t,
+                             grpc_chttp2_stream_list_id id) {
+  return t->lists[id].head == NULL;
+}
+
+static int stream_list_pop(grpc_chttp2_transport *t,
+                           grpc_chttp2_stream **stream,
+                           grpc_chttp2_stream_list_id id) {
+  grpc_chttp2_stream *s = t->lists[id].head;
+  if (s) {
+    grpc_chttp2_stream *new_head = s->links[id].next;
+    GPR_ASSERT(s->included[id]);
+    if (new_head) {
+      t->lists[id].head = new_head;
+      new_head->links[id].prev = NULL;
+    } else {
+      t->lists[id].head = NULL;
+      t->lists[id].tail = NULL;
+    }
+    s->included[id] = 0;
+  }
+  *stream = s;
+  return s != 0;
+}
+
+static void stream_list_remove(grpc_chttp2_transport *t, grpc_chttp2_stream *s,
+                               grpc_chttp2_stream_list_id id) {
+  GPR_ASSERT(s->included[id]);
+  s->included[id] = 0;
+  if (s->links[id].prev) {
+    s->links[id].prev->links[id].next = s->links[id].next;
+  } else {
+    GPR_ASSERT(t->lists[id].head == s);
+    t->lists[id].head = s->links[id].next;
+  }
+  if (s->links[id].next) {
+    s->links[id].next->links[id].prev = s->links[id].prev;
+  } else {
+    t->lists[id].tail = s->links[id].prev;
+  }
+}
+
+static bool stream_list_maybe_remove(grpc_chttp2_transport *t,
+                                     grpc_chttp2_stream *s,
+                                     grpc_chttp2_stream_list_id id) {
+  if (s->included[id]) {
+    stream_list_remove(t, s, id);
+    return true;
+  } else {
+    return false;
+  }
+}
+
+static void stream_list_add_tail(grpc_chttp2_transport *t,
+                                 grpc_chttp2_stream *s,
+                                 grpc_chttp2_stream_list_id id) {
+  grpc_chttp2_stream *old_tail;
+  GPR_ASSERT(!s->included[id]);
+  old_tail = t->lists[id].tail;
+  s->links[id].next = NULL;
+  s->links[id].prev = old_tail;
+  if (old_tail) {
+    old_tail->links[id].next = s;
+  } else {
+    t->lists[id].head = s;
+  }
+  t->lists[id].tail = s;
+  s->included[id] = 1;
+}
+
+static bool stream_list_add(grpc_chttp2_transport *t, grpc_chttp2_stream *s,
+                            grpc_chttp2_stream_list_id id) {
+  if (s->included[id]) {
+    return false;
+  }
+  stream_list_add_tail(t, s, id);
+  return true;
+}
+
+/* wrappers for specializations */
+
+bool grpc_chttp2_list_add_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  GPR_ASSERT(stream_global->id != 0);
+  return stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                         STREAM_FROM_GLOBAL(stream_global),
+                         GRPC_CHTTP2_LIST_WRITABLE);
+}
+
+int grpc_chttp2_list_pop_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_global **stream_global,
+    grpc_chttp2_stream_writing **stream_writing) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_WRITABLE);
+  if (r != 0) {
+    *stream_global = &stream->global;
+    *stream_writing = &stream->writing;
+  }
+  return r;
+}
+
+bool grpc_chttp2_list_remove_writable_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  return stream_list_maybe_remove(TRANSPORT_FROM_GLOBAL(transport_global),
+                                  STREAM_FROM_GLOBAL(stream_global),
+                                  GRPC_CHTTP2_LIST_WRITABLE);
+}
+
+void grpc_chttp2_list_add_writing_stream(
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_writing *stream_writing) {
+  GPR_ASSERT(stream_list_add(TRANSPORT_FROM_WRITING(transport_writing),
+                             STREAM_FROM_WRITING(stream_writing),
+                             GRPC_CHTTP2_LIST_WRITING));
+}
+
+int grpc_chttp2_list_have_writing_streams(
+    grpc_chttp2_transport_writing *transport_writing) {
+  return !stream_list_empty(TRANSPORT_FROM_WRITING(transport_writing),
+                            GRPC_CHTTP2_LIST_WRITING);
+}
+
+int grpc_chttp2_list_pop_writing_stream(
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_writing **stream_writing) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_WRITING(transport_writing), &stream,
+                          GRPC_CHTTP2_LIST_WRITING);
+  if (r != 0) {
+    *stream_writing = &stream->writing;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_written_stream(
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_writing *stream_writing) {
+  stream_list_add(TRANSPORT_FROM_WRITING(transport_writing),
+                  STREAM_FROM_WRITING(stream_writing),
+                  GRPC_CHTTP2_LIST_WRITTEN);
+}
+
+int grpc_chttp2_list_pop_written_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_global **stream_global,
+    grpc_chttp2_stream_writing **stream_writing) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_WRITING(transport_writing), &stream,
+                          GRPC_CHTTP2_LIST_WRITTEN);
+  if (r != 0) {
+    *stream_global = &stream->global;
+    *stream_writing = &stream->writing;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_unannounced_incoming_window_available(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  GPR_ASSERT(stream_global->id != 0);
+  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                  STREAM_FROM_GLOBAL(stream_global),
+                  GRPC_CHTTP2_LIST_UNANNOUNCED_INCOMING_WINDOW_AVAILABLE);
+}
+
+void grpc_chttp2_list_remove_unannounced_incoming_window_available(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_maybe_remove(
+      TRANSPORT_FROM_GLOBAL(transport_global),
+      STREAM_FROM_GLOBAL(stream_global),
+      GRPC_CHTTP2_LIST_UNANNOUNCED_INCOMING_WINDOW_AVAILABLE);
+}
+
+int grpc_chttp2_list_pop_unannounced_incoming_window_available(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_transport_parsing *transport_parsing,
+    grpc_chttp2_stream_global **stream_global,
+    grpc_chttp2_stream_parsing **stream_parsing) {
+  grpc_chttp2_stream *stream;
+  int r =
+      stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                      GRPC_CHTTP2_LIST_UNANNOUNCED_INCOMING_WINDOW_AVAILABLE);
+  if (r != 0) {
+    *stream_global = &stream->global;
+    *stream_parsing = &stream->parsing;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_parsing_seen_stream(
+    grpc_chttp2_transport_parsing *transport_parsing,
+    grpc_chttp2_stream_parsing *stream_parsing) {
+  stream_list_add(TRANSPORT_FROM_PARSING(transport_parsing),
+                  STREAM_FROM_PARSING(stream_parsing),
+                  GRPC_CHTTP2_LIST_PARSING_SEEN);
+}
+
+int grpc_chttp2_list_pop_parsing_seen_stream(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_transport_parsing *transport_parsing,
+    grpc_chttp2_stream_global **stream_global,
+    grpc_chttp2_stream_parsing **stream_parsing) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_PARSING(transport_parsing), &stream,
+                          GRPC_CHTTP2_LIST_PARSING_SEEN);
+  if (r != 0) {
+    *stream_global = &stream->global;
+    *stream_parsing = &stream->parsing;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_waiting_for_concurrency(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                  STREAM_FROM_GLOBAL(stream_global),
+                  GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY);
+}
+
+int grpc_chttp2_list_pop_waiting_for_concurrency(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global **stream_global) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_WAITING_FOR_CONCURRENCY);
+  if (r != 0) {
+    *stream_global = &stream->global;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_check_read_ops(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                  STREAM_FROM_GLOBAL(stream_global),
+                  GRPC_CHTTP2_LIST_CHECK_READ_OPS);
+}
+
+int grpc_chttp2_list_pop_check_read_ops(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global **stream_global) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_CHECK_READ_OPS);
+  if (r != 0) {
+    *stream_global = &stream->global;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_writing_stalled_by_transport(
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_writing *stream_writing) {
+  grpc_chttp2_stream *stream = STREAM_FROM_WRITING(stream_writing);
+  if (!stream->included[GRPC_CHTTP2_LIST_WRITING_STALLED_BY_TRANSPORT]) {
+    GRPC_CHTTP2_STREAM_REF(&stream->global, "chttp2_writing_stalled");
+  }
+  stream_list_add(TRANSPORT_FROM_WRITING(transport_writing), stream,
+                  GRPC_CHTTP2_LIST_WRITING_STALLED_BY_TRANSPORT);
+}
+
+void grpc_chttp2_list_flush_writing_stalled_by_transport(
+    grpc_exec_ctx *exec_ctx, grpc_chttp2_transport_writing *transport_writing,
+    bool is_window_available) {
+  grpc_chttp2_stream *stream;
+  grpc_chttp2_transport *transport = TRANSPORT_FROM_WRITING(transport_writing);
+  while (stream_list_pop(transport, &stream,
+                         GRPC_CHTTP2_LIST_WRITING_STALLED_BY_TRANSPORT)) {
+    if (is_window_available) {
+      grpc_chttp2_become_writable(&transport->global, &stream->global);
+    } else {
+      grpc_chttp2_list_add_stalled_by_transport(transport_writing,
+                                                &stream->writing);
+    }
+    GRPC_CHTTP2_STREAM_UNREF(exec_ctx, &stream->global,
+                             "chttp2_writing_stalled");
+  }
+}
+
+void grpc_chttp2_list_add_stalled_by_transport(
+    grpc_chttp2_transport_writing *transport_writing,
+    grpc_chttp2_stream_writing *stream_writing) {
+  stream_list_add(TRANSPORT_FROM_WRITING(transport_writing),
+                  STREAM_FROM_WRITING(stream_writing),
+                  GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
+}
+
+int grpc_chttp2_list_pop_stalled_by_transport(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global **stream_global) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
+  if (r != 0) {
+    *stream_global = &stream->global;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_remove_stalled_by_transport(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_maybe_remove(TRANSPORT_FROM_GLOBAL(transport_global),
+                           STREAM_FROM_GLOBAL(stream_global),
+                           GRPC_CHTTP2_LIST_STALLED_BY_TRANSPORT);
+}
+
+void grpc_chttp2_list_add_closed_waiting_for_parsing(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                  STREAM_FROM_GLOBAL(stream_global),
+                  GRPC_CHTTP2_LIST_CLOSED_WAITING_FOR_PARSING);
+}
+
+int grpc_chttp2_list_pop_closed_waiting_for_parsing(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global **stream_global) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_CLOSED_WAITING_FOR_PARSING);
+  if (r != 0) {
+    *stream_global = &stream->global;
+  }
+  return r;
+}
+
+void grpc_chttp2_list_add_closed_waiting_for_writing(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global *stream_global) {
+  stream_list_add(TRANSPORT_FROM_GLOBAL(transport_global),
+                  STREAM_FROM_GLOBAL(stream_global),
+                  GRPC_CHTTP2_LIST_CLOSED_WAITING_FOR_WRITING);
+}
+
+int grpc_chttp2_list_pop_closed_waiting_for_writing(
+    grpc_chttp2_transport_global *transport_global,
+    grpc_chttp2_stream_global **stream_global) {
+  grpc_chttp2_stream *stream;
+  int r = stream_list_pop(TRANSPORT_FROM_GLOBAL(transport_global), &stream,
+                          GRPC_CHTTP2_LIST_CLOSED_WAITING_FOR_WRITING);
+  if (r != 0) {
+    *stream_global = &stream->global;
+  }
+  return r;
+}
+
+void grpc_chttp2_register_stream(grpc_chttp2_transport *t,
+                                 grpc_chttp2_stream *s) {
+  stream_list_add_tail(t, s, GRPC_CHTTP2_LIST_ALL_STREAMS);
+}
+
+int grpc_chttp2_unregister_stream(grpc_chttp2_transport *t,
+                                  grpc_chttp2_stream *s) {
+  stream_list_maybe_remove(t, s, GRPC_CHTTP2_LIST_ALL_STREAMS);
+  return stream_list_empty(t, GRPC_CHTTP2_LIST_ALL_STREAMS);
+}
+
+int grpc_chttp2_has_streams(grpc_chttp2_transport *t) {
+  return !stream_list_empty(t, GRPC_CHTTP2_LIST_ALL_STREAMS);
+}
+
+void grpc_chttp2_for_all_streams(
+    grpc_chttp2_transport_global *transport_global, void *user_data,
+    void (*cb)(grpc_chttp2_transport_global *transport_global, void *user_data,
+               grpc_chttp2_stream_global *stream_global)) {
+  grpc_chttp2_stream *s;
+  grpc_chttp2_transport *t = TRANSPORT_FROM_GLOBAL(transport_global);
+  for (s = t->lists[GRPC_CHTTP2_LIST_ALL_STREAMS].head; s != NULL;
+       s = s->links[GRPC_CHTTP2_LIST_ALL_STREAMS].next) {
+    cb(transport_global, user_data, &s->global);
+  }
+}