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utils.hpp
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utils.hpp
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/**
* @file utils.hpp
*
* @copyright 2021-2022 extratype
*
* System utilities and utilities for WinSpd.
*/
#ifndef CHUNKDISK_UTILS_HPP_
#define CHUNKDISK_UTILS_HPP_
#include <memory>
#include <string>
#include <shared_mutex>
#include <winspd/winspd.h>
#include "types.hpp"
namespace chunkdisk
{
// shared_mutex is an SRW lock in Windows
// unique_lock or shared_lock
template <class Derived>
class SRWLockBase
{
std::unique_lock<std::shared_mutex> ulock_;
std::shared_lock<std::shared_mutex> slock_;
public:
SRWLockBase() = default;
SRWLockBase(std::shared_mutex& m, bool is_exclusive)
{
if (is_exclusive)
{
ulock_ = std::unique_lock(m);
static_cast<Derived*>(this)->on_locked(true);
}
else
{
slock_ = std::shared_lock(m);
static_cast<Derived*>(this)->on_locked(false);
}
}
SRWLockBase(std::shared_mutex& m, bool is_exclusive, std::defer_lock_t t)
{
if (is_exclusive)
{
ulock_ = std::unique_lock(m, t);
}
else
{
slock_ = std::shared_lock(m, t);
}
}
SRWLockBase(std::shared_mutex& m, bool is_exclusive, std::adopt_lock_t t)
{
if (is_exclusive)
{
ulock_ = std::unique_lock(m, t);
}
else
{
slock_ = std::shared_lock(m, t);
}
}
SRWLockBase(SRWLockBase&& other) noexcept = default;
~SRWLockBase()
{
if (!*this) return;
unlock();
}
SRWLockBase& operator=(SRWLockBase&& other) noexcept = default;
// always false if no mutex associated
bool is_exclusive() const noexcept { return ulock_.mutex() != nullptr; }
auto* mutex() const noexcept { return is_exclusive() ? ulock_.mutex() : slock_.mutex(); }
explicit operator bool() const noexcept { return bool(ulock_) || bool(slock_); }
void lock()
{
if (*this) throw std::system_error(std::make_error_code(std::errc::resource_deadlock_would_occur));
if (ulock_.mutex() != nullptr)
{
ulock_.lock();
static_cast<Derived*>(this)->on_locked(true);
}
else if (slock_.mutex() != nullptr)
{
slock_.lock();
static_cast<Derived*>(this)->on_locked(false);
}
else
{
throw std::system_error(std::make_error_code(std::errc::operation_not_permitted));
}
}
bool try_lock()
{
if (*this) throw std::system_error(std::make_error_code(std::errc::resource_deadlock_would_occur));
if (ulock_.mutex() != nullptr)
{
auto locked = ulock_.try_lock();
if (locked) static_cast<Derived*>(this)->on_locked(true);
return locked;
}
else if (slock_.mutex() != nullptr)
{
auto locked = slock_.try_lock();
if (locked) static_cast<Derived*>(this)->on_locked(false);
return locked;
}
else
{
throw std::system_error(std::make_error_code(std::errc::operation_not_permitted));
}
}
void unlock()
{
if (!*this) throw std::system_error(std::make_error_code(std::errc::operation_not_permitted));
if (ulock_.mutex() != nullptr)
{
static_cast<Derived*>(this)->on_unlock(true);
ulock_.unlock();
}
else if (slock_.mutex() != nullptr)
{
static_cast<Derived*>(this)->on_unlock(false);
slock_.unlock();
}
else
{
throw std::system_error(std::make_error_code(std::errc::operation_not_permitted));
}
}
// switch between exclusive and shared lock
bool switch_lock()
{
auto excl = is_exclusive();
auto* m = mutex();
if (m == nullptr) return false;
auto owns = bool(*this);
if (owns) unlock();
if (excl)
{
ulock_.release();
slock_ = std::shared_lock(*m, std::defer_lock);
}
else
{
slock_.release();
ulock_ = std::unique_lock(*m, std::defer_lock);
}
if (owns) lock();
return !excl;
}
auto* release() noexcept
{
auto* um = ulock_.release();
auto* sm = slock_.release();
return um != nullptr ? um : sm;
}
void on_locked(bool is_exclusive);
void on_unlock(bool is_exclusive);
};
class SRWLock : public SRWLockBase<SRWLock>
{
public:
SRWLock() : SRWLockBase() {}
SRWLock(std::shared_mutex& m, bool is_exclusive)
: SRWLockBase(m, is_exclusive) {}
SRWLock(std::shared_mutex& m, bool is_exclusive, std::defer_lock_t t)
: SRWLockBase(m, is_exclusive, t) {}
SRWLock(std::shared_mutex& m, bool is_exclusive, std::adopt_lock_t t)
: SRWLockBase(m, is_exclusive, t) {}
SRWLock(SRWLock&& other) noexcept = default;
SRWLock& operator=(SRWLock&& other) noexcept = default;
void on_locked(bool is_exclusive) {}
void on_unlock(bool is_exclusive) {}
};
template <class T, class Deleter, usize defval = 0>
struct GenericDeleter
{
void operator()(T x) noexcept
{
Deleter()(x);
}
struct pointer
{
pointer(T x) : value(x) {}
operator T() const { return value; }
pointer(std::nullptr_t = nullptr) : value(recast<T>(defval)) {}
explicit operator bool() const { return value != recast<T>(defval); }
friend bool operator==(pointer lhs, pointer rhs) { return lhs.value == rhs.value; }
T value;
};
};
struct HandleDeleter
{
void operator()(HANDLE h) noexcept
{
CloseHandle(h);
}
};
using GenericHandle = std::unique_ptr<void, GenericDeleter<HANDLE, HandleDeleter>>;
using FileHandle = std::unique_ptr<void, GenericDeleter<HANDLE, HandleDeleter, usize(-1)>>;
struct PagesDeleter
{
void operator()(LPVOID p) noexcept
{
VirtualFree(p, 0, MEM_RELEASE);
}
};
// deleted by VirtualFree()
using Pages = std::unique_ptr<void, PagesDeleter>;
// text may or may not be null-terminated
DWORD ConvertUTF8(const u8* text, int size, std::wstring& result);
// match to SpdStorageUnitStartDispatcher() behavior
DWORD GetThreadCount(PDWORD ThreadCount);
u64 GetSystemFileTime();
void SetScsiError(SPD_IOCTL_STORAGE_UNIT_STATUS* status, u8 sense_key, u8 asc);
void SetScsiError(SPD_IOCTL_STORAGE_UNIT_STATUS* status, u8 sense_key, u8 asc, u64 info);
} // namespace chunkdisk
template <class... Ts>
static void SpdLogInfo(PCWSTR format, Ts&&... args)
{
SpdServiceLog(EVENTLOG_INFORMATION_TYPE, const_cast<PWSTR>(format), std::forward<Ts>(args)...);
}
template <class... Ts>
static void SpdLogWarn(PCWSTR format, Ts&&... args)
{
SpdServiceLog(EVENTLOG_WARNING_TYPE, const_cast<PWSTR>(format), std::forward<Ts>(args)...);
}
template <class... Ts>
static void SpdLogErr(PCWSTR format, Ts&&... args)
{
SpdServiceLog(EVENTLOG_ERROR_TYPE, const_cast<PWSTR>(format), std::forward<Ts>(args)...);
}
#define SpdWarnOnce(expr) \
do \
{ \
static LONG Once; \
if (!(expr) && \
InterlockedCompareExchange(&Once, 1, 0) == 0)\
SpdLogWarn(L"WARNONCE(%S) failed at %S:%d", #expr, __func__, __LINE__);\
} while (0,0)
#endif