54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
#pragma once
|
|
|
|
#include <mutex>
|
|
#include <QDateTime>
|
|
#include <QDate>
|
|
|
|
namespace Services
|
|
{
|
|
/**
|
|
* Some (maybe all) QDateTime static functions are not thread-safe and thus can result in data races.
|
|
* This trivial service class wraps some of these functions and employs a mutex to prevent data races.
|
|
*/
|
|
class DateTimeService
|
|
{
|
|
public:
|
|
/**
|
|
* The QDateTime::currentDateTime() static function is not thread-safe. This may be caused by the
|
|
* underlying interfacing with the system clock.
|
|
*
|
|
* @return
|
|
*/
|
|
static QDateTime currentDateTime() {
|
|
const auto lock = std::unique_lock(DateTimeService::systemClockMutex);
|
|
return QDateTime::currentDateTime();
|
|
}
|
|
|
|
/**
|
|
* This function calls QDateTime::currentDateTime(). See comment for DateTime::currentDateTime().
|
|
*
|
|
* @return
|
|
*/
|
|
static QDate currentDate() {
|
|
const auto lock = std::unique_lock(DateTimeService::systemClockMutex);
|
|
return QDateTime::currentDateTime().date();
|
|
}
|
|
|
|
/**
|
|
* The QDateTime::timeZoneAbbreviation() is a non-static member function but it may still interface with the
|
|
* system clock. This can result in race conditions when called simultaneously to QDateTime::currentDateTime(),
|
|
* and so any calls to it must require possession of the mutex.
|
|
*
|
|
* @param dateTime
|
|
* @return
|
|
*/
|
|
static QString getTimeZoneAbbreviation(const QDateTime& dateTime) {
|
|
const auto lock = std::unique_lock(DateTimeService::systemClockMutex);
|
|
return dateTime.timeZoneAbbreviation();
|
|
}
|
|
|
|
private:
|
|
static inline std::mutex systemClockMutex;
|
|
};
|
|
}
|