rpcs3/Utilities/SharedMutex.h
Nekotekina 8ae3401ffa Some things improved
shared_mutex_t implemented
GUI Emu Callbacks rewritten
fxm::import, fxm::import_always implemented
cellMsgDialog rewritten
Emu.CallAfter improved (returns std::future)
2015-09-22 16:48:21 +03:00

47 lines
918 B
C++

#pragma once
#include <shared_mutex>
// An attempt to create lock-free (in optimistic case) implementation similar to std::shared_mutex;
// MSVC implementation of std::shared_timed_mutex is not lock-free and thus may be slow, and std::shared_mutex is not available.
class shared_mutex_t
{
struct ownership_info_t
{
u32 readers : 31;
u32 writers : 1;
u16 waiting_readers;
u16 waiting_writers;
};
atomic_t<ownership_info_t> m_info{};
std::mutex m_mutex;
std::condition_variable m_rcv;
std::condition_variable m_wcv;
std::condition_variable m_wrcv;
std::condition_variable m_wwcv;
public:
shared_mutex_t() = default;
// Lock in shared mode
void lock_shared();
// Try to lock in shared mode
bool try_lock_shared();
// Unlock in shared mode
void unlock_shared();
// Lock exclusively
void lock();
// Try to lock exclusively
bool try_lock();
// Unlock exclusively
void unlock();
};