matt335672
3700867e87
Allows a polled timer to be set for a future event. The timeout values are suitable for passing to g_obj_wait() or poll().
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2025
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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/**
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* @file common/timers.h
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* @brief Timers and related functions (declarations)
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* @author Matt Burt
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*/
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#if defined(HAVE_CONFIG_H)
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#include "config_ac.h"
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#endif
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#include "os_calls.h"
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#include "timers.h"
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struct timers_oneshot
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{
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unsigned int add_time; // Time event was added from_g_get_elapsed_ms()
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int trigger_time;
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};
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/******************************************************************************/
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struct timers_oneshot *
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timers_oneshot_init(int ms)
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{
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struct timers_oneshot *t = (struct timers_oneshot *)malloc(sizeof(*t));
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if (t != NULL)
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{
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t->add_time = g_get_elapsed_ms();
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t->trigger_time = (ms <= 0) ? 0 : ms;
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}
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return t;
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}
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/******************************************************************************/
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int
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timers_oneshot_get_remaining(struct timers_oneshot *timer,
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unsigned int now)
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{
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int rv = -1;
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if (timer != NULL)
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{
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if (timer->trigger_time == 0)
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{
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rv = 0;
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}
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else
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{
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rv = timer->trigger_time - (int)(now - timer->add_time);
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if (rv <= 0)
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{
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rv = 0;
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// (pathological) Make sure the timer doesn't stop
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// triggering if it isn't attended to for the rollover
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// period (~20 days for a 32-bit timer).
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timer->trigger_time = 0;
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}
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}
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}
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return rv;
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}
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/******************************************************************************/
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void
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timers_oneshot_update_poll(struct timers_oneshot *timer, unsigned int now,
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int *timeout)
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{
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if (timer != NULL && timeout != NULL)
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{
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int remaining = timers_oneshot_get_remaining(timer, now);
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if (*timeout < 0 || *timeout > remaining)
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{
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*timeout = remaining;
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}
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}
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}
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