diff options
Diffstat (limited to 'src/core/lib/iomgr/iocp_windows.c')
| -rw-r--r-- | src/core/lib/iomgr/iocp_windows.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/core/lib/iomgr/iocp_windows.c b/src/core/lib/iomgr/iocp_windows.c new file mode 100644 index 0000000000..682a32c0da --- /dev/null +++ b/src/core/lib/iomgr/iocp_windows.c @@ -0,0 +1,208 @@ +/* + * + * Copyright 2015-2016, Google Inc. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following disclaimer + * in the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Google Inc. nor the names of its + * contributors may be used to endorse or promote products derived from + * this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <grpc/support/port_platform.h> + +#ifdef GPR_WINSOCK_SOCKET + +#include <winsock2.h> + +#include <grpc/support/alloc.h> +#include <grpc/support/log.h> +#include <grpc/support/log_win32.h> +#include <grpc/support/thd.h> + +#include "src/core/lib/iomgr/iocp_windows.h" +#include "src/core/lib/iomgr/iomgr_internal.h" +#include "src/core/lib/iomgr/socket_windows.h" +#include "src/core/lib/iomgr/timer.h" + +static ULONG g_iocp_kick_token; +static OVERLAPPED g_iocp_custom_overlap; + +static gpr_atm g_custom_events = 0; + +static HANDLE g_iocp; + +static DWORD deadline_to_millis_timeout(gpr_timespec deadline, + gpr_timespec now) { + gpr_timespec timeout; + static const int64_t max_spin_polling_us = 10; + if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { + return INFINITE; + } + if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros( + max_spin_polling_us, + GPR_TIMESPAN))) <= 0) { + return 0; + } + timeout = gpr_time_sub(deadline, now); + return (DWORD)gpr_time_to_millis(gpr_time_add( + timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN))); +} + +grpc_iocp_work_status grpc_iocp_work(grpc_exec_ctx *exec_ctx, + gpr_timespec deadline) { + BOOL success; + DWORD bytes = 0; + DWORD flags = 0; + ULONG_PTR completion_key; + LPOVERLAPPED overlapped; + grpc_winsocket *socket; + grpc_winsocket_callback_info *info; + grpc_closure *closure = NULL; + success = GetQueuedCompletionStatus( + g_iocp, &bytes, &completion_key, &overlapped, + deadline_to_millis_timeout(deadline, gpr_now(deadline.clock_type))); + if (success == 0 && overlapped == NULL) { + return GRPC_IOCP_WORK_TIMEOUT; + } + GPR_ASSERT(completion_key && overlapped); + if (overlapped == &g_iocp_custom_overlap) { + gpr_atm_full_fetch_add(&g_custom_events, -1); + if (completion_key == (ULONG_PTR)&g_iocp_kick_token) { + /* We were awoken from a kick. */ + return GRPC_IOCP_WORK_KICK; + } + gpr_log(GPR_ERROR, "Unknown custom completion key."); + abort(); + } + + socket = (grpc_winsocket *)completion_key; + if (overlapped == &socket->write_info.overlapped) { + info = &socket->write_info; + } else if (overlapped == &socket->read_info.overlapped) { + info = &socket->read_info; + } else { + gpr_log(GPR_ERROR, "Unknown IOCP operation"); + abort(); + } + success = WSAGetOverlappedResult(socket->socket, &info->overlapped, &bytes, + FALSE, &flags); + info->bytes_transfered = bytes; + info->wsa_error = success ? 0 : WSAGetLastError(); + GPR_ASSERT(overlapped == &info->overlapped); + GPR_ASSERT(!info->has_pending_iocp); + gpr_mu_lock(&socket->state_mu); + if (info->closure) { + closure = info->closure; + info->closure = NULL; + } else { + info->has_pending_iocp = 1; + } + gpr_mu_unlock(&socket->state_mu); + grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL); + return GRPC_IOCP_WORK_WORK; +} + +void grpc_iocp_init(void) { + g_iocp = + CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, (ULONG_PTR)NULL, 0); + GPR_ASSERT(g_iocp); +} + +void grpc_iocp_kick(void) { + BOOL success; + + gpr_atm_full_fetch_add(&g_custom_events, 1); + success = PostQueuedCompletionStatus(g_iocp, 0, (ULONG_PTR)&g_iocp_kick_token, + &g_iocp_custom_overlap); + GPR_ASSERT(success); +} + +void grpc_iocp_flush(void) { + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + grpc_iocp_work_status work_status; + + do { + work_status = grpc_iocp_work(&exec_ctx, gpr_inf_past(GPR_CLOCK_MONOTONIC)); + } while (work_status == GRPC_IOCP_WORK_KICK || + grpc_exec_ctx_flush(&exec_ctx)); +} + +void grpc_iocp_shutdown(void) { + grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT; + while (gpr_atm_acq_load(&g_custom_events)) { + grpc_iocp_work(&exec_ctx, gpr_inf_future(GPR_CLOCK_MONOTONIC)); + grpc_exec_ctx_flush(&exec_ctx); + } + grpc_exec_ctx_finish(&exec_ctx); + GPR_ASSERT(CloseHandle(g_iocp)); +} + +void grpc_iocp_add_socket(grpc_winsocket *socket) { + HANDLE ret; + if (socket->added_to_iocp) return; + ret = CreateIoCompletionPort((HANDLE)socket->socket, g_iocp, + (uintptr_t)socket, 0); + if (!ret) { + char *utf8_message = gpr_format_message(WSAGetLastError()); + gpr_log(GPR_ERROR, "Unable to add socket to iocp: %s", utf8_message); + gpr_free(utf8_message); + __debugbreak(); + abort(); + } + socket->added_to_iocp = 1; + GPR_ASSERT(ret == g_iocp); +} + +/* Calling notify_on_read or write means either of two things: + -) The IOCP already completed in the background, and we need to call + the callback now. + -) The IOCP hasn't completed yet, and we're queuing it for later. */ +static void socket_notify_on_iocp(grpc_exec_ctx *exec_ctx, + grpc_winsocket *socket, grpc_closure *closure, + grpc_winsocket_callback_info *info) { + GPR_ASSERT(info->closure == NULL); + gpr_mu_lock(&socket->state_mu); + if (info->has_pending_iocp) { + info->has_pending_iocp = 0; + grpc_exec_ctx_enqueue(exec_ctx, closure, true, NULL); + } else { + info->closure = closure; + } + gpr_mu_unlock(&socket->state_mu); +} + +void grpc_socket_notify_on_write(grpc_exec_ctx *exec_ctx, + grpc_winsocket *socket, + grpc_closure *closure) { + socket_notify_on_iocp(exec_ctx, socket, closure, &socket->write_info); +} + +void grpc_socket_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_winsocket *socket, + grpc_closure *closure) { + socket_notify_on_iocp(exec_ctx, socket, closure, &socket->read_info); +} + +#endif /* GPR_WINSOCK_SOCKET */ |