David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 1 | /* |
| 2 | * |
Craig Tiller | 6169d5f | 2016-03-31 07:46:18 -0700 | [diff] [blame] | 3 | * Copyright 2015, Google Inc. |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions are |
| 8 | * met: |
| 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
| 16 | * * Neither the name of Google Inc. nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
| 19 | * |
| 20 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 24 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 25 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 26 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 27 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 28 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 29 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 30 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | * |
| 32 | */ |
| 33 | |
David Klempner | 78dc6cd | 2015-01-26 15:02:51 -0800 | [diff] [blame] | 34 | #include <grpc/support/port_platform.h> |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 35 | |
| 36 | #ifdef GPR_LINUX_EVENTFD |
David Klempner | 78dc6cd | 2015-01-26 15:02:51 -0800 | [diff] [blame] | 37 | |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 38 | #include <errno.h> |
| 39 | #include <sys/eventfd.h> |
| 40 | #include <unistd.h> |
| 41 | |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 42 | #include <grpc/support/log.h> |
| 43 | |
Craig Tiller | 9533d04 | 2016-03-25 17:11:06 -0700 | [diff] [blame] | 44 | #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
| 45 | #include "src/core/lib/profiling/timers.h" |
Craig Tiller | 0ba432d | 2015-10-09 16:57:11 -0700 | [diff] [blame] | 46 | |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 47 | static grpc_error* eventfd_create(grpc_wakeup_fd* fd_info) { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 48 | int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 49 | if (efd < 0) { |
| 50 | return GRPC_OS_ERROR(errno, "eventfd"); |
| 51 | } |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 52 | fd_info->read_fd = efd; |
| 53 | fd_info->write_fd = -1; |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 54 | return GRPC_ERROR_NONE; |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 55 | } |
| 56 | |
Craig Tiller | 1aee536 | 2016-05-07 11:26:50 -0700 | [diff] [blame] | 57 | static grpc_error* eventfd_consume(grpc_wakeup_fd* fd_info) { |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 58 | eventfd_t value; |
| 59 | int err; |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 60 | do { |
| 61 | err = eventfd_read(fd_info->read_fd, &value); |
| 62 | } while (err < 0 && errno == EINTR); |
Craig Tiller | f66c374 | 2016-05-18 07:25:50 -0700 | [diff] [blame^] | 63 | if (err < 0 && errno != EAGAIN) { |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 64 | return GRPC_OS_ERROR(errno, "eventfd_read"); |
| 65 | } |
| 66 | return GRPC_ERROR_NONE; |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 67 | } |
| 68 | |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 69 | static grpc_error* eventfd_wakeup(grpc_wakeup_fd* fd_info) { |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 70 | int err; |
Craig Tiller | 0ba432d | 2015-10-09 16:57:11 -0700 | [diff] [blame] | 71 | GPR_TIMER_BEGIN("eventfd_wakeup", 0); |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 72 | do { |
| 73 | err = eventfd_write(fd_info->read_fd, 1); |
| 74 | } while (err < 0 && errno == EINTR); |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 75 | if (err < 0) { |
Craig Tiller | ac492c0 | 2016-05-18 07:19:56 -0700 | [diff] [blame] | 76 | return GRPC_OS_ERROR(errno, "eventfd_write"); |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 77 | } |
Craig Tiller | 0ba432d | 2015-10-09 16:57:11 -0700 | [diff] [blame] | 78 | GPR_TIMER_END("eventfd_wakeup", 0); |
Craig Tiller | 0f75fbe | 2016-05-06 21:10:06 -0700 | [diff] [blame] | 79 | return GRPC_ERROR_NONE; |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 80 | } |
| 81 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 82 | static void eventfd_destroy(grpc_wakeup_fd* fd_info) { |
| 83 | if (fd_info->read_fd != 0) close(fd_info->read_fd); |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 84 | } |
| 85 | |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 86 | static int eventfd_check_availability(void) { |
David Klempner | 78dc6cd | 2015-01-26 15:02:51 -0800 | [diff] [blame] | 87 | /* TODO(klempner): Actually check if eventfd is available */ |
| 88 | return 1; |
| 89 | } |
| 90 | |
Craig Tiller | a3b18d9 | 2015-02-02 14:48:13 -0800 | [diff] [blame] | 91 | const grpc_wakeup_fd_vtable grpc_specialized_wakeup_fd_vtable = { |
Craig Tiller | a82950e | 2015-09-22 12:33:20 -0700 | [diff] [blame] | 92 | eventfd_create, eventfd_consume, eventfd_wakeup, eventfd_destroy, |
| 93 | eventfd_check_availability}; |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 94 | |
David Klempner | dbb4f94 | 2015-01-21 17:45:18 -0800 | [diff] [blame] | 95 | #endif /* GPR_LINUX_EVENTFD */ |