class shared_timed_mutex;
(since C++14)The shared_timed_mutex class is a synchronization primitive that can be used to protect shared data from being simultaneously accessed by multiple threads. In contrast to other mutex types which facilitate exclusive access, a shared_timed_mutex has two levels of access:
Shared mutexes are usually used in situations when multiple readers can access the same resource at the same time without causing data races, but only one writer can do so.
In a manner similar to timed_mutex, shared_timed_mutex provides the ability to attempt to claim ownership of a shared_timed_mutex with a timeout via the try_lock_for(), try_lock_until(), try_lock_shared_for(), try_lock_shared_until() member functions.
The shared_timed_mutex class satisfies all requirements of SharedTimedMutex and StandardLayoutType.
A copy assignment operator for a class that holds resources that can handle multiple readers, but only one writer.
#include <mutex>
#include <shared_mutex>
class R
{
mutable std::shared_timed_mutex mut;
/* data */
public:
R& operator=(const R& other)
{
// requires exclusive ownership to write to *this
std::unique_lock<std::shared_timed_mutex> lhs(mut, std::defer_lock);
// requires shared ownership to read from other
std::shared_lock<std::shared_timed_mutex> rhs(other.mut, std::defer_lock);
std::lock(lhs, rhs);
/* assign data */
return *this;
}
};
int main()
{
R r;
}
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