Merge github.com:grpc/grpc into flowctl+millis

1 files changed, 148 insertions, 0 deletions

diff --git a/src/core/lib/iomgr/iocp_windows.cc b/src/core/lib/iomgr/iocp_windows.cc
new file mode 100644
index 0000000000..336cc86c75
--- /dev/null
+++ b/src/core/lib/iomgr/iocp_windows.cc
@@ -0,0 +1,148 @@
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include "src/core/lib/iomgr/port.h"
+
+#ifdef GRPC_WINSOCK_SOCKET
+
+#include <winsock2.h>
+
+#include <grpc/support/alloc.h>
+#include <grpc/support/log.h>
+#include <grpc/support/log_windows.h>
+#include <grpc/support/thd.h>
+#include <grpc/support/useful.h>
+
+#include "src/core/lib/debug/stats.h"
+#include "src/core/lib/iomgr/iocp_windows.h"
+#include "src/core/lib/iomgr/iomgr_internal.h"
+#include "src/core/lib/iomgr/socket_windows.h"
+#include "src/core/lib/iomgr/timer.h"
+
+static ULONG g_iocp_kick_token;
+static OVERLAPPED g_iocp_custom_overlap;
+
+static gpr_atm g_custom_events = 0;
+
+static HANDLE g_iocp;
+
+static DWORD deadline_to_millis_timeout(grpc_exec_ctx *exec_ctx,
+                                        grpc_millis deadline) {
+  gpr_timespec timeout;
+  if (deadline == GRPC_MILLIS_INF_FUTURE) {
+    return INFINITE;
+  }
+  return (DWORD)GPR_MAX(0, deadline - grpc_exec_ctx_now(exec_ctx));
+}
+
+grpc_iocp_work_status grpc_iocp_work(grpc_exec_ctx *exec_ctx,
+                                     grpc_millis deadline) {
+  BOOL success;
+  DWORD bytes = 0;
+  DWORD flags = 0;
+  ULONG_PTR completion_key;
+  LPOVERLAPPED overlapped;
+  grpc_winsocket *socket;
+  grpc_winsocket_callback_info *info;
+  GRPC_STATS_INC_SYSCALL_POLL(exec_ctx);
+  success =
+      GetQueuedCompletionStatus(g_iocp, &bytes, &completion_key, &overlapped,
+                                deadline_to_millis_timeout(exec_ctx, deadline));
+  if (success == 0 && overlapped == NULL) {
+    return GRPC_IOCP_WORK_TIMEOUT;
+  }
+  GPR_ASSERT(completion_key && overlapped);
+  if (overlapped == &g_iocp_custom_overlap) {
+    gpr_atm_full_fetch_add(&g_custom_events, -1);
+    if (completion_key == (ULONG_PTR)&g_iocp_kick_token) {
+      /* We were awoken from a kick. */
+      return GRPC_IOCP_WORK_KICK;
+    }
+    gpr_log(GPR_ERROR, "Unknown custom completion key.");
+    abort();
+  }
+
+  socket = (grpc_winsocket *)completion_key;
+  if (overlapped == &socket->write_info.overlapped) {
+    info = &socket->write_info;
+  } else if (overlapped == &socket->read_info.overlapped) {
+    info = &socket->read_info;
+  } else {
+    abort();
+  }
+  success = WSAGetOverlappedResult(socket->socket, &info->overlapped, &bytes,
+                                   FALSE, &flags);
+  info->bytes_transfered = bytes;
+  info->wsa_error = success ? 0 : WSAGetLastError();
+  GPR_ASSERT(overlapped == &info->overlapped);
+  grpc_socket_become_ready(exec_ctx, socket, info);
+  return GRPC_IOCP_WORK_WORK;
+}
+
+void grpc_iocp_init(void) {
+  g_iocp =
+      CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, (ULONG_PTR)NULL, 0);
+  GPR_ASSERT(g_iocp);
+}
+
+void grpc_iocp_kick(void) {
+  BOOL success;
+
+  gpr_atm_full_fetch_add(&g_custom_events, 1);
+  success = PostQueuedCompletionStatus(g_iocp, 0, (ULONG_PTR)&g_iocp_kick_token,
+                                       &g_iocp_custom_overlap);
+  GPR_ASSERT(success);
+}
+
+void grpc_iocp_flush(void) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  grpc_iocp_work_status work_status;
+
+  do {
+    work_status = grpc_iocp_work(&exec_ctx, GRPC_MILLIS_INF_PAST);
+  } while (work_status == GRPC_IOCP_WORK_KICK ||
+           grpc_exec_ctx_flush(&exec_ctx));
+}
+
+void grpc_iocp_shutdown(void) {
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+  while (gpr_atm_acq_load(&g_custom_events)) {
+    grpc_iocp_work(&exec_ctx, GRPC_MILLIS_INF_FUTURE);
+    grpc_exec_ctx_flush(&exec_ctx);
+  }
+  grpc_exec_ctx_finish(&exec_ctx);
+  GPR_ASSERT(CloseHandle(g_iocp));
+}
+
+void grpc_iocp_add_socket(grpc_winsocket *socket) {
+  HANDLE ret;
+  if (socket->added_to_iocp) return;
+  ret = CreateIoCompletionPort((HANDLE)socket->socket, g_iocp,
+                               (uintptr_t)socket, 0);
+  if (!ret) {
+    char *utf8_message = gpr_format_message(WSAGetLastError());
+    gpr_log(GPR_ERROR, "Unable to add socket to iocp: %s", utf8_message);
+    gpr_free(utf8_message);
+    __debugbreak();
+    abort();
+  }
+  socket->added_to_iocp = 1;
+  GPR_ASSERT(ret == g_iocp);
+}
+
+#endif /* GRPC_WINSOCK_SOCKET */