Merge pull request #157 from dklempner/eventfd
Add support for eventfd based kicking on linux.pull/255/head
Craig Tiller
10 years ago
commit
3b56a57b25
19 changed files with 634 additions and 125 deletions
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/*
|
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <grpc/support/port_platform.h> |
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#ifdef GPR_LINUX_EVENTFD |
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#include <errno.h> |
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#include <sys/eventfd.h> |
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#include <unistd.h> |
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#include "src/core/iomgr/wakeup_fd_posix.h" |
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#include <grpc/support/log.h> |
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static void eventfd_create(grpc_wakeup_fd_info *fd_info) { |
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int efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC); |
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/* TODO(klempner): Handle failure more gracefully */ |
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GPR_ASSERT(efd >= 0); |
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fd_info->read_fd = efd; |
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fd_info->write_fd = -1; |
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} |
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static void eventfd_consume(grpc_wakeup_fd_info *fd_info) { |
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eventfd_t value; |
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int err; |
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do { |
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err = eventfd_read(fd_info->read_fd, &value); |
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} while (err < 0 && errno == EINTR); |
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} |
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static void eventfd_wakeup(grpc_wakeup_fd_info *fd_info) { |
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int err; |
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do { |
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err = eventfd_write(fd_info->read_fd, 1); |
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} while (err < 0 && errno == EINTR); |
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} |
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static void eventfd_destroy(grpc_wakeup_fd_info *fd_info) { |
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close(fd_info->read_fd); |
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} |
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static int eventfd_check_availability(void) { |
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/* TODO(klempner): Actually check if eventfd is available */ |
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return 1; |
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} |
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const grpc_wakeup_fd_vtable specialized_wakeup_fd_vtable = { |
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eventfd_create, eventfd_consume, eventfd_wakeup, eventfd_destroy, |
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eventfd_check_availability |
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}; |
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#endif /* GPR_LINUX_EVENTFD */ |
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@ -0,0 +1,53 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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/*
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* This is a dummy file to provide an invalid specialized_wakeup_fd_vtable on |
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* systems without anything better than pipe. |
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*/ |
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#include <grpc/support/port_platform.h> |
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#ifndef GPR_POSIX_HAS_SPECIAL_WAKEUP_FD |
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#include "src/core/iomgr/wakeup_fd.h" |
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static int check_availability_invalid(void) { |
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return 0; |
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} |
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const grpc_wakeup_fd_vtable specialized_wakeup_fd_vtable = { |
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NULL, NULL, NULL, NULL, check_availability_invalid |
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}; |
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#endif /* GPR_POSIX_HAS_SPECIAL_WAKEUP */ |
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@ -0,0 +1,93 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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/* TODO(klempner): Allow this code to be disabled. */ |
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#include "src/core/iomgr/wakeup_fd_posix.h" |
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#include <errno.h> |
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#include <string.h> |
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#include <unistd.h> |
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#include "src/core/iomgr/socket_utils_posix.h" |
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#include <grpc/support/log.h> |
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static void pipe_create(grpc_wakeup_fd_info *fd_info) { |
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int pipefd[2]; |
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/* TODO(klempner): Make this nonfatal */ |
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GPR_ASSERT(0 == pipe(pipefd)); |
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GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[0], 1)); |
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GPR_ASSERT(grpc_set_socket_nonblocking(pipefd[1], 1)); |
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fd_info->read_fd = pipefd[0]; |
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fd_info->write_fd = pipefd[1]; |
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} |
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static void pipe_consume(grpc_wakeup_fd_info *fd_info) { |
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char buf[128]; |
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int r; |
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for (;;) { |
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r = read(fd_info->read_fd, buf, sizeof(buf)); |
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if (r > 0) continue; |
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if (r == 0) return; |
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switch (errno) { |
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case EAGAIN: |
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return; |
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case EINTR: |
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continue; |
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default: |
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gpr_log(GPR_ERROR, "error reading pipe: %s", strerror(errno)); |
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return; |
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} |
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} |
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} |
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static void pipe_wakeup(grpc_wakeup_fd_info *fd_info) { |
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char c = 0; |
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while (write(fd_info->write_fd, &c, 1) != 1 && errno == EINTR) |
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; |
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} |
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static void pipe_destroy(grpc_wakeup_fd_info *fd_info) { |
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close(fd_info->read_fd); |
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close(fd_info->write_fd); |
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} |
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static int pipe_check_availability(void) { |
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/* Assume that pipes are always available. */ |
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return 1; |
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} |
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const grpc_wakeup_fd_vtable pipe_wakeup_fd_vtable = { |
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pipe_create, pipe_consume, pipe_wakeup, pipe_destroy, pipe_check_availability |
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}; |
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@ -0,0 +1,41 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#ifndef __GRPC_INTERNAL_IOMGR_WAKEUP_FD_PIPE_H_ |
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#define __GRPC_INTERNAL_IOMGR_WAKEUP_FD_PIPE_H_ |
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#include "src/core/iomgr/wakeup_fd_posix.h" |
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extern grpc_wakeup_fd_vtable pipe_wakeup_fd_vtable; |
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#endif /* __GRPC_INTERNAL_IOMGR_WAKEUP_FD_PIPE_H_ */ |
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@ -0,0 +1,70 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include "src/core/iomgr/wakeup_fd_posix.h" |
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#include "src/core/iomgr/wakeup_fd_pipe.h" |
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#include <stddef.h> |
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static const grpc_wakeup_fd_vtable *wakeup_fd_vtable = NULL; |
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void grpc_wakeup_fd_global_init(void) { |
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if (specialized_wakeup_fd_vtable.check_availability()) { |
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wakeup_fd_vtable = &specialized_wakeup_fd_vtable; |
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} else { |
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wakeup_fd_vtable = &pipe_wakeup_fd_vtable; |
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} |
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} |
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void grpc_wakeup_fd_global_init_force_fallback(void) { |
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wakeup_fd_vtable = &pipe_wakeup_fd_vtable; |
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} |
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void grpc_wakeup_fd_global_destroy(void) { |
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wakeup_fd_vtable = NULL; |
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} |
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void grpc_wakeup_fd_create(grpc_wakeup_fd_info *fd_info) { |
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wakeup_fd_vtable->create(fd_info); |
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} |
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void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd_info *fd_info) { |
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wakeup_fd_vtable->consume(fd_info); |
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} |
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void grpc_wakeup_fd_wakeup(grpc_wakeup_fd_info *fd_info) { |
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wakeup_fd_vtable->wakeup(fd_info); |
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} |
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void grpc_wakeup_fd_destroy(grpc_wakeup_fd_info *fd_info) { |
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wakeup_fd_vtable->destroy(fd_info); |
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} |
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@ -0,0 +1,102 @@ |
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/*
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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/*
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* wakeup_fd abstracts the concept of a file descriptor for the purpose of |
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* waking up a thread in select()/poll()/epoll_wait()/etc. |
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* The poll() family of system calls provide a way for a thread to block until |
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* there is activity on one (or more) of a set of file descriptors. An |
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* application may wish to wake up this thread to do non file related work. The |
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* typical way to do this is to add a pipe to the set of file descriptors, then |
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* write to the pipe to wake up the thread in poll(). |
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* |
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* Linux has a lighter weight eventfd specifically designed for this purpose. |
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* wakeup_fd abstracts the difference between the two. |
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* |
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* Setup: |
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* 1. Before calling anything, call global_init() at least once. |
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* 1. Call grpc_wakeup_fd_create() to get a wakeup_fd. |
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* 2. Add the result of GRPC_WAKEUP_FD_FD to the set of monitored file |
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* descriptors for the poll() style API you are using. Monitor the file |
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* descriptor for readability. |
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* 3. To tear down, call grpc_wakeup_fd_destroy(). This closes the underlying |
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* file descriptor. |
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* |
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* Usage: |
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* 1. To wake up a polling thread, call grpc_wakeup_fd_wakeup() on a wakeup_fd |
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* it is monitoring. |
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* 2. If the polling thread was awakened by a wakeup_fd event, call |
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* grpc_wakeup_fd_consume_wakeup() on it. |
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*/ |
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#ifndef __GRPC_INTERNAL_IOMGR_WAKEUP_FD_POSIX_H_ |
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#define __GRPC_INTERNAL_IOMGR_WAKEUP_FD_POSIX_H_ |
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typedef struct grpc_wakeup_fd_info grpc_wakeup_fd_info; |
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void grpc_wakeup_fd_global_init(void); |
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void grpc_wakeup_fd_global_destroy(void); |
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void grpc_wakeup_fd_create(grpc_wakeup_fd_info *fd_info); |
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void grpc_wakeup_fd_consume_wakeup(grpc_wakeup_fd_info *fd_info); |
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void grpc_wakeup_fd_wakeup(grpc_wakeup_fd_info *fd_info); |
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void grpc_wakeup_fd_destroy(grpc_wakeup_fd_info *fd_info); |
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#define GRPC_WAKEUP_FD_GET_READ_FD(fd_info) ((fd_info)->read_fd) |
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/* Force using the fallback implementation. This is intended for testing
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* purposes only.*/ |
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void grpc_wakeup_fd_global_init_force_fallback(void); |
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/* Private structures; don't access their fields directly outside of wakeup fd
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* code. */ |
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struct grpc_wakeup_fd_info { |
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int read_fd; |
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int write_fd; |
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}; |
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|
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typedef struct grpc_wakeup_fd_vtable { |
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void (*create)(grpc_wakeup_fd_info *fd_info); |
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void (*consume)(grpc_wakeup_fd_info *fd_info); |
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void (*wakeup)(grpc_wakeup_fd_info *fd_info); |
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void (*destroy)(grpc_wakeup_fd_info *fd_info); |
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/* Must be called before calling any other functions */ |
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int (*check_availability)(void); |
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} grpc_wakeup_fd_vtable; |
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|
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/* Defined in some specialized implementation's .c file, or by
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* wakeup_fd_nospecial.c if no such implementation exists. */ |
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extern const grpc_wakeup_fd_vtable specialized_wakeup_fd_vtable; |
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#endif /* __GRPC_INTERNAL_IOMGR_WAKEUP_FD_POSIX_H_ */ |
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