1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
// Copyright 2022 The 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 <grpc/support/port_platform.h>
#include <utility>
#include "absl/strings/str_cat.h"
#include "src/core/lib/gprpp/crash.h" // IWYU pragma: keep
#include "src/core/lib/iomgr/port.h"
#ifdef GRPC_LINUX_EVENTFD
#include <errno.h>
#include <sys/eventfd.h>
#include <unistd.h>
#include "src/core/lib/event_engine/posix_engine/wakeup_fd_posix.h"
#endif
#include "src/core/lib/event_engine/posix_engine/wakeup_fd_eventfd.h"
#include "src/core/lib/gprpp/strerror.h"
namespace grpc_event_engine {
namespace experimental {
#ifdef GRPC_LINUX_EVENTFD
absl::Status EventFdWakeupFd::Init() {
int read_fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
int write_fd = -1;
if (read_fd < 0) {
return absl::Status(absl::StatusCode::kInternal,
absl::StrCat("eventfd: ", grpc_core::StrError(errno)));
}
SetWakeupFds(read_fd, write_fd);
return absl::OkStatus();
}
absl::Status EventFdWakeupFd::ConsumeWakeup() {
eventfd_t value;
int err;
do {
err = eventfd_read(ReadFd(), &value);
} while (err < 0 && errno == EINTR);
if (err < 0 && errno != EAGAIN) {
return absl::Status(
absl::StatusCode::kInternal,
absl::StrCat("eventfd_read: ", grpc_core::StrError(errno)));
}
return absl::OkStatus();
}
absl::Status EventFdWakeupFd::Wakeup() {
int err;
do {
err = eventfd_write(ReadFd(), 1);
} while (err < 0 && errno == EINTR);
if (err < 0) {
return absl::Status(
absl::StatusCode::kInternal,
absl::StrCat("eventfd_write: ", grpc_core::StrError(errno)));
}
return absl::OkStatus();
}
EventFdWakeupFd::~EventFdWakeupFd() {
if (ReadFd() != 0) {
close(ReadFd());
}
}
bool EventFdWakeupFd::IsSupported() {
EventFdWakeupFd event_fd_wakeup_fd;
return event_fd_wakeup_fd.Init().ok();
}
absl::StatusOr<std::unique_ptr<WakeupFd>>
EventFdWakeupFd::CreateEventFdWakeupFd() {
static bool kIsEventFdWakeupFdSupported = EventFdWakeupFd::IsSupported();
if (kIsEventFdWakeupFdSupported) {
auto event_fd_wakeup_fd = std::make_unique<EventFdWakeupFd>();
auto status = event_fd_wakeup_fd->Init();
if (status.ok()) {
return std::unique_ptr<WakeupFd>(std::move(event_fd_wakeup_fd));
}
return status;
}
return absl::NotFoundError("Eventfd wakeup fd is not supported");
}
#else // GRPC_LINUX_EVENTFD
#include "src/core/lib/gprpp/crash.h"
absl::Status EventFdWakeupFd::Init() { grpc_core::Crash("unimplemented"); }
absl::Status EventFdWakeupFd::ConsumeWakeup() {
grpc_core::Crash("unimplemented");
}
absl::Status EventFdWakeupFd::Wakeup() { grpc_core::Crash("unimplemented"); }
bool EventFdWakeupFd::IsSupported() { return false; }
absl::StatusOr<std::unique_ptr<WakeupFd>>
EventFdWakeupFd::CreateEventFdWakeupFd() {
return absl::NotFoundError("Eventfd wakeup fd is not supported");
}
#endif // GRPC_LINUX_EVENTFD
} // namespace experimental
} // namespace grpc_event_engine
|
