103 lines
2.7 KiB
C++
103 lines
2.7 KiB
C++
/**
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* PANDA 3D SOFTWARE
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* Copyright (c) Carnegie Mellon University. All rights reserved.
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*
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* All use of this software is subject to the terms of the revised BSD
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* license. You should have received a copy of this license along
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* with this source code in a file named "LICENSE."
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*
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* @file mutexWin32Impl.h
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* @author drose
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* @date 2006-02-07
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*/
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#ifndef MUTEXWIN32IMPL_H
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#define MUTEXWIN32IMPL_H
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#include "dtoolbase.h"
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#include "selectThreadImpl.h"
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#ifdef WIN32_VC
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN 1
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#endif
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#include <windows.h>
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/**
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* Uses SRWLock on Vista and above to implement a mutex. Older versions of
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* Windows fall back to a combination of a spinlock and an Event object.
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*/
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class EXPCL_DTOOL_DTOOLBASE MutexWin32Impl {
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public:
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constexpr MutexWin32Impl() = default;
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MutexWin32Impl(const MutexWin32Impl ©) = delete;
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INLINE ~MutexWin32Impl();
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MutexWin32Impl &operator = (const MutexWin32Impl ©) = delete;
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public:
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void unlock();
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static void init_lock_funcs();
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private:
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#ifndef CPPPARSER
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// Store function pointers; these point directly to the SRWLock Win32 API
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// functions on Vista and above, or to our own implementation on Windows XP.
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typedef void (__stdcall *LockFunc)(volatile PVOID *lock);
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typedef BOOL (__stdcall *TryLockFunc)(volatile PVOID *lock);
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typedef BOOL (__stdcall *CondWaitFunc)(volatile PVOID *cvar, volatile PVOID *lock, DWORD, ULONG);
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struct LockFunctions {
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LockFunc _lock;
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TryLockFunc _try_lock;
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LockFunc _unlock;
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CondWaitFunc _cvar_wait;
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LockFunc _cvar_notify_one;
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LockFunc _cvar_notify_all;
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};
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static LockFunctions _funcs;
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static void __stdcall lock_initially(volatile PVOID *lock);
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static BOOL __stdcall try_lock_initially(volatile PVOID *lock);
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static void __stdcall unlock_initially(volatile PVOID *lock);
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#endif
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private:
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// In the SRWLock implementation, only the first field is used. On Windows
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// XP, the first field contains a waiter count and lock bit, and the second
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// field contains an Event handle if contention has occurred.
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volatile PVOID _lock[2] = {nullptr, nullptr};
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friend class ConditionVarWin32Impl;
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};
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/**
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* Uses CRITICAL_SECTION to implement a recursive mutex.
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*/
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class EXPCL_DTOOL_DTOOLBASE ReMutexWin32Impl {
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public:
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ReMutexWin32Impl();
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ReMutexWin32Impl(const ReMutexWin32Impl ©) = delete;
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INLINE ~ReMutexWin32Impl();
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ReMutexWin32Impl &operator = (const ReMutexWin32Impl ©) = delete;
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public:
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INLINE void lock();
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INLINE bool try_lock();
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INLINE void unlock();
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private:
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CRITICAL_SECTION _lock;
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};
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#include "mutexWin32Impl.I"
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#endif // WIN32_VC
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#endif
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