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//
// Copyright 2017 Garrett D'Amore <garrett@damore.org>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
#include "core/nng_impl.h"
#ifdef PLATFORM_WINDOWS
#define NNI_WIN_IOCP_NTHREADS 4
#include <stdio.h>
// Windows IO Completion Port support. We basically creaet a single
// IO completion port, then start threads on it. Handles are added
// to the port on an as needed basis. We use a single IO completion
// port for pretty much everything.
static HANDLE nni_win_global_iocp = NULL;
static nni_thr nni_win_iocp_thrs[NNI_WIN_IOCP_NTHREADS];
static nni_mtx nni_win_iocp_mtx;
static void
nni_win_iocp_handler(void *arg)
{
HANDLE iocp;
DWORD cnt;
ULONG_PTR key;
OVERLAPPED *olpd;
nni_win_event *evt;
int status;
BOOL rv;
NNI_ARG_UNUSED(arg);
iocp = nni_win_global_iocp;
for (;;) {
key = 0;
olpd = NULL;
status = 0;
cnt = 0;
rv = GetQueuedCompletionStatus(iocp, &cnt, &key, &olpd,
INFINITE);
if (rv == FALSE) {
if (olpd == NULL) {
// Completion port bailed...
break;
}
}
NNI_ASSERT(olpd != NULL);
evt = (void *) olpd;
NNI_ASSERT(evt->cb != NULL);
evt->cb(evt->ptr);
}
}
int
nni_win_iocp_register(HANDLE h)
{
if (CreateIoCompletionPort(h, nni_win_global_iocp, 0, 0) == NULL) {
return (nni_win_error(GetLastError()));
}
return (0);
}
int
nni_win_event_init(nni_win_event *evt, nni_cb cb, void *ptr, HANDLE h)
{
ZeroMemory(&evt->olpd, sizeof (evt->olpd));
evt->olpd.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (evt->olpd.hEvent == NULL) {
return (nni_win_error(GetLastError()));
}
nni_aio_list_init(&evt->aios);
evt->ptr = ptr;
evt->cb = cb;
evt->h = h;
return (0);
}
void
nni_win_event_fini(nni_win_event *evt)
{
if (evt->olpd.hEvent != NULL) {
(void) CloseHandle(evt->olpd.hEvent);
evt->olpd.hEvent = NULL;
}
}
int
nni_win_event_reset(nni_win_event *evt)
{
if (!ResetEvent(evt->olpd.hEvent)) {
return (nni_win_error(GetLastError()));
}
return (0);
}
OVERLAPPED *
nni_win_event_overlapped(nni_win_event *evt)
{
return (&evt->olpd);
}
void
nni_win_event_cancel(nni_win_event *evt)
{
int rv;
DWORD cnt;
// Try to cancel the event...
if (!CancelIoEx(evt->h, &evt->olpd)) {
// None was found. That's good.
if ((rv = GetLastError()) == ERROR_NOT_FOUND) {
// Nothing queued. We may in theory be running
// the callback via the completion port handler;
// caller must synchronize that separately.
return;
}
// It's unclear why we would ever fail in this
// circumstance. Is there a kind of "uncancellable I/O"
// here, or somesuch? In this case we just wait hard
// using the success case -- its the best we can do.
}
// This basically just waits for the canceled I/O to complete.
// The end result can be either success or ERROR_OPERATION_ABORTED.
// It turns out we don't much care either way; we just want to make
// sure that we don't have any I/O pending on the overlapped
// structure before we release it or reuse it.
GetOverlappedResult(evt->h, &evt->olpd, &cnt, TRUE);
}
int
nni_win_iocp_sysinit(void)
{
HANDLE h;
int i;
int rv;
h = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0,
NNI_WIN_IOCP_NTHREADS);
if (h == NULL) {
return (nni_win_error(GetLastError()));
}
nni_win_global_iocp = h;
for (i = 0; i < NNI_WIN_IOCP_NTHREADS; i++) {
rv = nni_thr_init(&nni_win_iocp_thrs[i], nni_win_iocp_handler,
NULL);
if (rv != 0) {
goto fail;
}
}
if ((rv = nni_mtx_init(&nni_win_iocp_mtx)) != 0) {
goto fail;
}
for (i = 0; i < NNI_WIN_IOCP_NTHREADS; i++) {
nni_thr_run(&nni_win_iocp_thrs[i]);
}
return (0);
fail:
if ((h = nni_win_global_iocp) != NULL) {
CloseHandle(h);
nni_win_global_iocp = NULL;
}
for (i = 0; i < NNI_WIN_IOCP_NTHREADS; i++) {
nni_thr_fini(&nni_win_iocp_thrs[i]);
}
return (rv);
}
void
nni_win_iocp_sysfini(void)
{
int i;
HANDLE h;
if ((h = nni_win_global_iocp) != NULL) {
CloseHandle(h);
nni_win_global_iocp = NULL;
}
for (i = 0; i < NNI_WIN_IOCP_NTHREADS; i++) {
nni_thr_fini(&nni_win_iocp_thrs[i]);
}
nni_mtx_fini(&nni_win_iocp_mtx);
}
#else
// Suppress empty symbols warnings in ranlib.
int nni_win_iocp_not_used = 0;
#endif // PLATFORM_WINDOWS
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