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vcmi/lib/CondSh.h

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#pragma once
/*
* CondSh.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
/// Used for multithreading, wraps boost functions
template <typename T> struct CondSh
{
T data;
boost::condition_variable cond;
boost::mutex mx;
CondSh() {}
CondSh(T t) : data(t) {}
// set data
void set(T t)
{
boost::unique_lock<boost::mutex> lock(mx);
data = t;
}
// set data and notify
void setn(T t)
{
set(t);
cond.notify_all();
};
// get stored value
T get()
{
boost::unique_lock<boost::mutex> lock(mx);
return data;
}
// waits until data is set to false
void waitWhileTrue()
{
boost::unique_lock<boost::mutex> un(mx);
while(data)
cond.wait(un);
}
// waits while data is set to arg
void waitWhile(const T & t)
{
boost::unique_lock<boost::mutex> un(mx);
while(data == t)
cond.wait(un);
}
// waits until data is set to arg
void waitUntil(const T & t)
{
boost::unique_lock<boost::mutex> un(mx);
while(data != t)
cond.wait(un);
}
};