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Bayonne2 / Common C++ 2 Framework
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Bayonne2 / Common C++ 2 Framework
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Timer ports are used to provide synchronized timing events when managed under a "service thread" such as SocketService. More...
#include <thread.h>
Public Member Functions | |
| TimerPort () | |
| Create a timer, mark it as inactive, and set the initial "start" time to the creation time of the timer object. More... | |
| void | setTimer (timeout_t timeout=0) |
| Set a new start time for the object based on when this call is made and optionally activate the timer for a specified number of milliseconds. More... | |
| void | incTimer (timeout_t timeout) |
| Set a timeout based on the current time reference value either from object creation or the last setTimer(). More... | |
| void | decTimer (timeout_t timeout) |
| Adjust a timeout based on the current time reference value either from object creation or the last setTimer(). More... | |
| void | sleepTimer (void) |
| Sleep until the current timer expires. More... | |
| void | endTimer (void) |
| This is used to "disable" the service thread from expiring the timer object. More... | |
| timeout_t | getTimer (void) const |
| This is used by service threads to determine how much time remains before the timer expires based on a timeout specified in setTimer() or incTimer(). More... | |
| timeout_t | getElapsed (void) const |
| This is used to determine how much time has elapsed since a timer port setTimer benchmark time was initially set. More... | |
Private Attributes | |
| struct timeval | timer |
| bool | active |
Timer ports are used to provide synchronized timing events when managed under a "service thread" such as SocketService.
This is made into a stand-alone base class since other derived libraries (such as the serial handlers) may also use the pooled "service thread" model and hence also require this code for managing timing.
| TimerPort::TimerPort | ( | ) |
Create a timer, mark it as inactive, and set the initial "start" time to the creation time of the timer object.
This allows "incTimer" to initially refer to time delays relative to the original start time of the object.
| void TimerPort::decTimer | ( | timeout_t | timeout | ) |
Adjust a timeout based on the current time reference value either from object creation or the last setTimer().
This reference can be used to time synchronize realtime data over specified intervals and force expiration when a new frame should be released in a synchronized manner.
| timeout | delay in milliseconds from reference. |
| void TimerPort::endTimer | ( | void | ) |
This is used to "disable" the service thread from expiring the timer object.
It does not effect the reference time from either creation or a setTimer().
| timeout_t TimerPort::getElapsed | ( | void | ) | const |
This is used to determine how much time has elapsed since a timer port setTimer benchmark time was initially set.
This allows one to use setTimer() to set the timer to the current time and then measure elapsed time from that point forward.
return time elapsed in milliseconds, or TIMEOUT_INF if inactive.
| timeout_t TimerPort::getTimer | ( | void | ) | const |
This is used by service threads to determine how much time remains before the timer expires based on a timeout specified in setTimer() or incTimer().
It can also be called after setting a timeout with incTimer() to see if the current timeout has already expired and hence that the application is already delayed and should skip frame(s).
return time remaining in milliseconds, or TIMEOUT_INF if inactive.
| void TimerPort::incTimer | ( | timeout_t | timeout | ) |
Set a timeout based on the current time reference value either from object creation or the last setTimer().
This reference can be used to time synchronize realtime data over specified intervals and force expiration when a new frame should be released in a synchronized manner.
| timeout | delay in milliseconds from reference. |
| void TimerPort::setTimer | ( | timeout_t | timeout = 0 | ) |
Set a new start time for the object based on when this call is made and optionally activate the timer for a specified number of milliseconds.
This can be used to set the starting time of a realtime session.
| timeout | delay in milliseconds from "now" |
| void TimerPort::sleepTimer | ( | void | ) |
Sleep until the current timer expires.
This is useful in time syncing realtime periodic tasks.
1.8.6