Merge branch 'master' into binary_logging

1 files changed, 85 insertions, 0 deletions

diff --git a/src/core/lib/iomgr/wakeup_fd_eventfd.c b/src/core/lib/iomgr/wakeup_fd_eventfd.c
new file mode 100644
index 0000000000..41ded0ca4d
--- /dev/null
+++ b/src/core/lib/iomgr/wakeup_fd_eventfd.c
@@ -0,0 +1,85 @@
+/*
+ *
+ * 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 <grpc/support/port_platform.h>
+
+#ifdef GPR_LINUX_EVENTFD
+
+#include <errno.h>
+#include <sys/eventfd.h>
+#include <unistd.h>
+
+#include <grpc/support/log.h>
+
+#include "src/core/lib/iomgr/wakeup_fd_posix.h"
+#include "src/core/lib/profiling/timers.h"
+
+static void eventfd_create(grpc_wakeup_fd* fd_info) {
+  int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
+  /* TODO(klempner): Handle failure more gracefully */
+  GPR_ASSERT(efd >= 0);
+  fd_info->read_fd = efd;
+  fd_info->write_fd = -1;
+}
+
+static void eventfd_consume(grpc_wakeup_fd* fd_info) {
+  eventfd_t value;
+  int err;
+  do {
+    err = eventfd_read(fd_info->read_fd, &value);
+  } while (err < 0 && errno == EINTR);
+}
+
+static void eventfd_wakeup(grpc_wakeup_fd* fd_info) {
+  int err;
+  GPR_TIMER_BEGIN("eventfd_wakeup", 0);
+  do {
+    err = eventfd_write(fd_info->read_fd, 1);
+  } while (err < 0 && errno == EINTR);
+  GPR_TIMER_END("eventfd_wakeup", 0);
+}
+
+static void eventfd_destroy(grpc_wakeup_fd* fd_info) {
+  if (fd_info->read_fd != 0) close(fd_info->read_fd);
+}
+
+static int eventfd_check_availability(void) {
+  /* TODO(klempner): Actually check if eventfd is available */
+  return 1;
+}
+
+const grpc_wakeup_fd_vtable grpc_specialized_wakeup_fd_vtable = {
+    eventfd_create, eventfd_consume, eventfd_wakeup, eventfd_destroy,
+    eventfd_check_availability};
+
+#endif /* GPR_LINUX_EVENTFD */