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/*
// Copyright (c) 2010-2017 Intel Corporation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
*/
#include <rte_cycles.h>
#include <rte_common.h>
#include "clock.h"
#include "input.h"
static struct input *inputs[32];
static int n_inputs;
static int max_input_fd;
int reg_input(struct input *in)
{
if (n_inputs == sizeof(inputs)/sizeof(inputs[0]))
return -1;
for (int i = 0; i < n_inputs; ++i) {
if (inputs[i] == in)
return -1;
}
inputs[n_inputs++] = in;
max_input_fd = RTE_MAX(in->fd, max_input_fd);
return 0;
}
void unreg_input(struct input *in)
{
int rm, i;
for (rm = 0; rm < n_inputs; ++rm) {
if (inputs[rm] == in) {
break;
}
}
if (rm == n_inputs)
return ;
for (i = rm + 1; i < n_inputs; ++i) {
inputs[i - 1] = inputs[i];
}
n_inputs--;
max_input_fd = 0;
for (i = 0; i < n_inputs; ++i) {
max_input_fd = RTE_MAX(inputs[i]->fd, max_input_fd);
}
}
static int tsc_diff_to_tv(uint64_t beg, uint64_t end, struct timeval *tv)
{
if (end < beg) {
return -1;
}
uint64_t diff = end - beg;
tsc_to_tv(tv, diff);
return 0;
}
void input_proc_until(uint64_t deadline)
{
struct timeval tv;
fd_set in_fd;
int ret = 1;
/* Keep checking for input until select() returned 0 (timeout
occurred before input was read) or current time has passed
the deadline (which occurs when time progresses past the
deadline between return of select() and the next
iteration). */
while (ret != 0 && tsc_diff_to_tv(rte_rdtsc(), deadline, &tv) == 0) {
FD_ZERO(&in_fd);
for (int i = 0; i < n_inputs; ++i) {
FD_SET(inputs[i]->fd, &in_fd);
}
ret = select(max_input_fd + 1, &in_fd, NULL, NULL, &tv);
if (ret > 0) {
for (int i = 0; i < n_inputs; ++i) {
if (FD_ISSET(inputs[i]->fd, &in_fd)) {
inputs[i]->proc_input(inputs[i]);
}
}
}
}
}
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