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//
// Copyright 2024 Staysail Systems, Inc. <info@staysail.tech>
// Copyright 2018 Capitar IT Group BV <info@capitar.com>
//
// 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 NNG_PLATFORM_WINDOWS
#include <stdio.h>
// Windows IO Completion Port support. We basically create 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 int win_io_nthr = 0;
static HANDLE win_io_h = NULL;
static nni_thr *win_io_thrs;
static void
win_io_handler(void *arg)
{
NNI_ARG_UNUSED(arg);
for (;;) {
DWORD cnt;
BOOL ok;
nni_win_io *item;
OVERLAPPED *olpd = NULL;
ULONG_PTR key = 0;
int rv;
ok = GetQueuedCompletionStatus(
win_io_h, &cnt, &key, &olpd, 5000);
if (olpd == NULL) {
// Completion port closed...
break;
}
item = CONTAINING_RECORD(olpd, nni_win_io, olpd);
rv = ok ? 0 : nni_win_error(GetLastError());
item->cb(item, rv, (size_t) cnt);
}
}
int
nni_win_io_register(HANDLE h)
{
if (CreateIoCompletionPort(h, win_io_h, 0, 0) == NULL) {
return (nni_win_error(GetLastError()));
}
return (0);
}
void
nni_win_io_init(nni_win_io *io, nni_win_io_cb cb, void *ptr)
{
ZeroMemory(&io->olpd, sizeof(io->olpd));
io->cb = cb;
io->ptr = ptr;
io->aio = NULL;
}
int
nni_win_io_sysinit(nng_init_params *params)
{
HANDLE h;
int i;
int rv;
int16_t num_thr;
int16_t max_thr;
max_thr = params->max_poller_threads;
num_thr = params->num_poller_threads;
if ((max_thr > 0) && (num_thr > max_thr)) {
num_thr = max_thr;
}
if (num_thr < 1) {
num_thr = 1;
}
params->num_poller_threads = num_thr;
if ((win_io_thrs = NNI_ALLOC_STRUCTS(win_io_thrs, num_thr)) == NULL) {
return (NNG_ENOMEM);
}
win_io_nthr = num_thr;
h = CreateIoCompletionPort(INVALID_HANDLE_VALUE, NULL, 0, num_thr);
if (h == NULL) {
return (nni_win_error(GetLastError()));
}
win_io_h = h;
for (i = 0; i < win_io_nthr; i++) {
rv = nni_thr_init(&win_io_thrs[i], win_io_handler, NULL);
if (rv != 0) {
goto fail;
}
nni_thr_set_name(&win_io_thrs[i], "nng:iocp");
}
for (i = 0; i < win_io_nthr; i++) {
nni_thr_run(&win_io_thrs[i]);
}
return (0);
fail:
nni_win_io_sysfini();
return (rv);
}
void
nni_win_io_sysfini(void)
{
int i;
HANDLE h;
if ((h = win_io_h) != NULL) {
// send wakeups in case closing the handle doesn't work
for (i = 0; i < win_io_nthr; i++) {
PostQueuedCompletionStatus(h, 0, 0, NULL);
}
CloseHandle(h);
for (i = 0; i < win_io_nthr; i++) {
nni_thr_fini(&win_io_thrs[i]);
}
win_io_h = NULL;
}
NNI_FREE_STRUCTS(win_io_thrs, win_io_nthr);
}
#endif // NNG_PLATFORM_WINDOWS
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