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cherry-pick from master to 2.1 (#728)
* Update OS version requirements (#663) * Update OS version requirements * Update operating system limits * Update operating system limits * Update operating system limits * Set rolling update limits * Liubo/check os version (#726) * Fix OS check * Fix OS check * fix yaml format
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /* | ||
| * | ||
| * Copyright 2017 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 <errno.h> | ||
| #include <sys/eventfd.h> | ||
| #include <sys/epoll.h> | ||
| #include <unistd.h> | ||
| #include <stdio.h> | ||
|
|
||
| #ifndef EPOLLEXCLUSIVE | ||
| #define EPOLLEXCLUSIVE (1 << 28) | ||
| #endif | ||
|
|
||
| /* This polling engine is only relevant on linux kernels supporting epoll() */ | ||
| bool grpc_is_epollexclusive_available(void) { | ||
| static bool logged_why_not = false; | ||
|
|
||
| int fd = epoll_create1(EPOLL_CLOEXEC); | ||
| if (fd < 0) { | ||
| if (!logged_why_not) { | ||
| printf( | ||
| "epoll_create1 failed with error: %d. Not using epollex polling " | ||
| "engine.", | ||
| fd); | ||
| logged_why_not = true; | ||
| } | ||
| return false; | ||
| } | ||
| int evfd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); | ||
| if (evfd < 0) { | ||
| if (!logged_why_not) { | ||
| printf( | ||
| "eventfd failed with error: %d. Not using epollex polling " | ||
| "engine.", | ||
| fd); | ||
| logged_why_not = true; | ||
| } | ||
| close(fd); | ||
| return false; | ||
| } | ||
| struct epoll_event ev; | ||
| /* choose events that should cause an error on | ||
| EPOLLEXCLUSIVE enabled kernels - specifically the combination of | ||
| EPOLLONESHOT and EPOLLEXCLUSIVE */ | ||
| ev.events = (uint32_t)(EPOLLET | EPOLLIN | EPOLLEXCLUSIVE | EPOLLONESHOT); | ||
| ev.data.ptr = NULL; | ||
| if (epoll_ctl(fd, EPOLL_CTL_ADD, evfd, &ev) != 0) { | ||
| if (errno != EINVAL) { | ||
| if (!logged_why_not) { | ||
| printf( | ||
| "epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT failed with error: " | ||
| "%d. Not using epollex polling engine.", | ||
| errno); | ||
| logged_why_not = true; | ||
| } | ||
| close(fd); | ||
| close(evfd); | ||
| return false; | ||
| } | ||
| } else { | ||
| if (!logged_why_not) { | ||
| printf( | ||
| "epoll_ctl with EPOLLEXCLUSIVE | EPOLLONESHOT succeeded. This is " | ||
| "evidence of no EPOLLEXCLUSIVE support. Not using " | ||
| "epollex polling engine."); | ||
| logged_why_not = true; | ||
| } | ||
| close(fd); | ||
| close(evfd); | ||
| return false; | ||
| } | ||
| close(evfd); | ||
| close(fd); | ||
| return true; | ||
| } | ||
|
|
||
| int main() { | ||
| if (grpc_is_epollexclusive_available()) { | ||
| printf("True: epollexclusive is available\n"); | ||
| return 0; | ||
| } else { | ||
| printf("False: epollexclusive is NOT available\n"); | ||
| return 1; | ||
| } | ||
| } |
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