diff options
author | Yash Tibrewal <yashkt@google.com> | 2017-09-21 18:56:08 -0700 |
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committer | Yash Tibrewal <yashkt@google.com> | 2017-10-02 16:29:41 -0700 |
commit | 83062842c3601faeddcae8f901c515e3c78f3661 (patch) | |
tree | 58536b25350a5f2b3123161ab4ca9b8ce01a43a5 /src/core/lib/iomgr/wakeup_fd_eventfd.cc | |
parent | 1c9b584a153ff592c92b6cf6baa620d8602a37cd (diff) |
Changes for C to C++. Adding extern C to header files for compatibility.
Also converting to .cc
Diffstat (limited to 'src/core/lib/iomgr/wakeup_fd_eventfd.cc')
-rw-r--r-- | src/core/lib/iomgr/wakeup_fd_eventfd.cc | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/wakeup_fd_eventfd.cc b/src/core/lib/iomgr/wakeup_fd_eventfd.cc new file mode 100644 index 0000000000..81cb7ee280 --- /dev/null +++ b/src/core/lib/iomgr/wakeup_fd_eventfd.cc @@ -0,0 +1,82 @@ +/* + * + * 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_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 grpc_error* eventfd_create(grpc_wakeup_fd* fd_info) { + int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); + if (efd < 0) { + return GRPC_OS_ERROR(errno, "eventfd"); + } + fd_info->read_fd = efd; + fd_info->write_fd = -1; + return GRPC_ERROR_NONE; +} + +static grpc_error* 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); + if (err < 0 && errno != EAGAIN) { + return GRPC_OS_ERROR(errno, "eventfd_read"); + } + return GRPC_ERROR_NONE; +} + +static grpc_error* 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); + if (err < 0) { + return GRPC_OS_ERROR(errno, "eventfd_write"); + } + GPR_TIMER_END("eventfd_wakeup", 0); + return GRPC_ERROR_NONE; +} + +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) { + const int efd = eventfd(0, 0); + const int is_available = efd >= 0; + if (is_available) close(efd); + return is_available; +} + +const grpc_wakeup_fd_vtable grpc_specialized_wakeup_fd_vtable = { + eventfd_create, eventfd_consume, eventfd_wakeup, eventfd_destroy, + eventfd_check_availability}; + +#endif /* GRPC_LINUX_EVENTFD */ |