native_client_sdk/src/libraries/nacl_io/stream/stream_event_emitter.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "nacl_io/stream/stream_event_emitter.h"
   6
   7 #include <poll.h>
   8 #include <stdint.h>
   9 #include <stdlib.h>
  10
  11 #include "nacl_io/fifo_interface.h"
  12 #include "sdk_util/auto_lock.h"
  13
  14 namespace nacl_io {
  15
  16 StreamEventEmitter::StreamEventEmitter() : stream_(NULL) {
  17 }
  18
  19 void StreamEventEmitter::AttachStream(StreamNode* stream) {
  20   AUTO_LOCK(GetLock());
  21   stream_ = stream;
  22 }
  23
  24 void StreamEventEmitter::DetachStream() {
  25   AUTO_LOCK(GetLock());
  26
  27   RaiseEvents_Locked(POLLHUP);
  28   stream_ = NULL;
  29 }
  30
  31 void StreamEventEmitter::UpdateStatus_Locked() {
  32   uint32_t status = 0;
  33   if (!in_fifo()->IsEmpty())
  34     status |= POLLIN;
  35
  36   if (!out_fifo()->IsFull())
  37     status |= POLLOUT;
  38
  39   ClearEvents_Locked(~status);
  40   RaiseEvents_Locked(status);
  41 }
  42
  43 }  // namespace nacl_io