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OtlSync.pas
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OtlSync.pas
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///<summary>Synchronisation primitives. Part of the OmniThreadLibrary project.</summary>
///<remarks>Move* family of functions require Pentium 4 processor (or newer).</remarks>
///<author>Primoz Gabrijelcic</author>
///<license>
///This software is distributed under the BSD license.
///
///Copyright (c) 2013, Primoz Gabrijelcic
///All rights reserved.
///
///Redistribution and use in source and binary forms, with or without modification,
///are permitted provided that the following conditions are met:
///- Redistributions of source code must retain the above copyright notice, this
/// list of conditions and the following disclaimer.
///- Redistributions in binary form must reproduce the above copyright notice,
/// this list of conditions and the following disclaimer in the documentation
/// and/or other materials provided with the distribution.
///- The name of the Primoz Gabrijelcic may not be used to endorse or promote
/// products derived from this software without specific prior written permission.
///
///THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
///ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
///WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
///DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
///ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
///(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
///LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
///ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
///(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
///SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
///</license>
///<remarks><para>
/// Home : http://otl.17slon.com
/// Support : http://otl.17slon.com/forum/
/// Author : Primoz Gabrijelcic
/// E-Mail : primoz@gabrijelcic.org
/// Blog : http://thedelphigeek.com
/// Web : http://gp.17slon.com
/// Contributors : GJ, Lee_Nover, dottor_jeckill
///
/// Creation date : 2009-03-30
/// Last modification : 2013-03-05
/// Version : 1.15
///</para><para>
/// History:
/// 1.15: 2013-03-05
/// - TOmniLockManager<K> is reentrant.
/// 1.14: 2013-02-27
/// - Implemented TOmniLockManager<K> and IOmniLockManager<K>.
/// 1.13a: 2013-01-08
/// - Locked<T>.Free must execute in locked context.
/// 1.13: 2012-02-21
/// - Implemented Locked<T>.Locked.
/// 1.12: 2011-12-16
/// - [GJ] Converted low-level primitives to work in 64-bit platform and added few
/// platform-independent versions (CAS, MoveDPtr).
/// 1.11: 2011-12-14
/// - Implemented simplified versions of Atomic<T:class,constructor>.Initialize and
/// Locked<T:class,constructor>.Initialize that work on D2010 and newer.
/// 1.10a: 2011-12-09
/// - TOmniCS reuses LockCount from owned TOmniCriticalSection.
/// 1.10: 2011-12-02
/// - Locked<class> by default takes ownership of the object and frees it when
/// Locked<> goes out of scope. You can change this by calling
/// Locked<T>.Create(obj, false). To free the object manually, call Locked<T>.Free.
/// - Atomic<class>.Initialize was broken.
/// - Implemented Atomic<class>.Initialize(object) and Locked<class>.Initialize.
/// - Implemented Mfence.
/// - Locked<T>.Initialize creates memory barrier after storing newly created
/// resource into shared variable.
/// 1.09: 2011-12-01
/// - IOmniCriticalSection implements TFixedCriticalSection (as suggested by Eric
/// Grange in http://delphitools.info/2011/11/30/fixing-tcriticalsection/).
/// - Implemented IOmniCriticalSection.LockCount and TOmniCS.LockCount.
/// - Locked<T>.GetValue raises exception if critical section's LockCount is 0.
/// 1.08: 2011-11-29
/// - Implements Locked<T> class.
/// 1.07a: 2011-11-29
/// - Compiles with D2007.
/// 1.07: 2011-11-25
/// - Implemented Atomic<T> class for atomic interface initialization.
/// 1.06: 2011-03-01
/// - [dottor_jeckill] Bug fix: TOmniResourceCount.TryAllocate always returned False.
/// 1.05: 2010-07-01
/// - Includes OTLOptions.inc.
/// 1.04a: 2010-03-30
/// - Prevent race condition in a rather specialized usage of TOmniResourceCount.
/// 1.04: 2010-02-04
/// - Implemented CAS8 and CAS16.
/// 1.03: 2010-02-03
/// - IOmniCancellationToken extended with the Clear method.
/// 1.02: 2010-02-02
/// - Implemented IOmniCancellationToken.
/// 1.01a: 2010-01-07
/// - "Wait when no resources" state in TOmniResourceCount was not properly
/// implemented.
/// 1.01: 2009-12-30
/// - Implemented resource counter with empty state signalling - TOmniResourceCount.
/// 1.0: 2008-08-26
/// - TOmniCS and IOmniCriticalSection imported from the OtlCommon unit.
/// - [GJ] Added very simple (and very fast) multi-reader-exclusive-writer TOmniMREW.
/// - First official release.
///</para></remarks>
unit OtlSync;
{$I OtlOptions.inc}
interface
uses
SysUtils,
SyncObjs,
Classes,
{$IFDEF OTL_Generics}
Generics.Defaults,
Generics.Collections,
{$ENDIF OTL_Generics}
DSiWin32,
{$IFDEF OTL_ERTTI}
RTTI,
{$ENDIF OTL_ERTTI}
GpStuff,
GpLists;
type
{$IF CompilerVersion < 23} //pre-XE2
NativeInt = integer;
PNativeInt = PInteger;
{$IFEND}
TFixedCriticalSection = class(TCriticalSection)
strict protected
FDummy: array [0..95] of byte;
end; { TFixedCriticalSection }
IOmniCriticalSection = interface ['{AA92906B-B92E-4C54-922C-7B87C23DABA9}']
function GetLockCount: integer;
//
procedure Acquire;
procedure Release;
function GetSyncObj: TSynchroObject;
property LockCount: integer read GetLockCount;
end; { IOmniCriticalSection }
///<summary>Simple critical section wrapper. Critical section is automatically
/// initialised on first use.</summary>
TOmniCS = record
strict private
ocsSync: IOmniCriticalSection;
private
function GetLockCount: integer; inline;
function GetSyncObj: TSynchroObject; inline;
public
procedure Initialize;
procedure Acquire; inline;
procedure Release; inline;
property LockCount: integer read GetLockCount;
property SyncObj: TSynchroObject read GetSyncObj;
end; { TOmniCS }
///<summary>Very lightweight multiple-readers-exclusive-writer lock.</summary>
TOmniMREW = record
strict private
//Treated as an integer, IInterface is only used to provide automatic initialization to 0.
//Bit0 is 'writing in progress' flag.
omrewReference: IInterface;
public
procedure EnterReadLock; inline;
procedure EnterWriteLock; inline;
procedure ExitReadLock; inline;
procedure ExitWriteLock; inline;
end; { TOmniMREW }
IOmniResourceCount = interface ['{F5281539-1DA4-45E9-8565-4BEA689A23AD}']
function GetHandle: THandle;
//
function Allocate: cardinal;
function Release: cardinal;
function TryAllocate(var resourceCount: cardinal; timeout_ms: cardinal = 0): boolean;
property Handle: THandle read GetHandle;
end; { IOmniResourceCount }
///<summary>Kind of an inverse semaphore. Gets signalled when count drops to 0.
/// Allocate decrements the count (and blocks if initial count is 0), Release
/// increments the count.</summary>
///<since>2009-12-30</since>
TOmniResourceCount = class(TInterfacedObject, IOmniResourceCount)
strict private
orcAvailable : TDSiEventHandle;
orcHandle : TDSiEventHandle;
orcLock : TOmniCS;
orcNumResources: TGp4AlignedInt;
protected
function GetHandle: THandle;
public
constructor Create(initialCount: cardinal);
destructor Destroy; override;
function Allocate: cardinal; inline;
function Release: cardinal;
function TryAllocate(var resourceCount: cardinal; timeout_ms: cardinal = 0): boolean;
property Handle: THandle read GetHandle;
end; { TOmniResourceCount }
IOmniCancellationToken = interface ['{5946F4E8-45C0-4E44-96AB-DBE2BE66A701}']
function GetHandle: THandle;
//
procedure Clear;
function IsSignalled: boolean;
procedure Signal;
property Handle: THandle read GetHandle;
end; { IOmniCancellationToken }
{$IFDEF OTL_Generics}
Atomic<T> = class
type TFactory = reference to function: T;
class function Initialize(var storage: T; factory: TFactory): T; overload;
{$IFDEF OTL_ERTTI}
class function Initialize(var storage: T): T; overload;
{$ENDIF OTL_ERTTI}
end; { Atomic<T> }
Locked<T> = record
strict private // keep those aligned!
FLock : TOmniCS;
FValue : T;
strict private
FInitialized: boolean;
FLifecycle : IInterface;
FLockCount : integer;
FOwnsObject : boolean;
procedure Clear; inline;
function GetValue: T; inline;
public
type TFactory = reference to function: T;
type TProcT = reference to procedure(const value: T);
constructor Create(const value: T; ownsObject: boolean = true);
class operator Implicit(const value: Locked<T>): T; inline;
class operator Implicit(const value: T): Locked<T>; inline;
function Initialize(factory: TFactory): T; overload;
{$IFDEF OTL_ERTTI}
function Initialize: T; overload;
{$ENDIF OTL_ERTTI}
procedure Acquire; inline;
procedure Locked(proc: TProc); overload; inline;
procedure Locked(proc: TProcT); overload; inline;
procedure Release; inline;
procedure Free; inline;
property Value: T read GetValue;
end; { Locked<T> }
IOmniLockManagerAutoUnlock = interface
procedure Unlock;
end; { IOmniLockManagerAutoUnlock }
IOmniLockManager<K> = interface
function Lock(const key: K; timeout_ms: cardinal): boolean;
function LockUnlock(const key: K; timeout_ms: cardinal): IOmniLockManagerAutoUnlock;
function Unlock(const key: K): boolean;
end; { IOmniLockManager<K> }
TOmniLockManager<K> = class(TInterfacedObject, IOmniLockManager<K>)
strict private type
TNotifyPair = class(TGpDoublyLinkedListObject)
Key : K;
Notify: TDSiEventHandle;
constructor Create(const aKey: K; aNotify: TDSiEventHandle);
end;
TLockValue = record
LockCount: integer;
ThreadID : cardinal;
constructor Create(aThreadID: cardinal; aLockCount: integer);
end;
strict private
FComparer : IEqualityComparer<K>;
FLock : TOmniCS;
FLockList : TDictionary<K,TLockValue>;
FNotifyList: TGpDoublyLinkedList;
strict private type
TAutoUnlock = class(TInterfacedObject, IOmniLockManagerAutoUnlock)
strict private
FUnlockProc: TProc;
public
constructor Create(unlockProc: TProc);
destructor Destroy; override;
procedure Unlock;
end;
public
class function CreateInterface(capacity: integer = 0): IOmniLockManager<K>; overload;
class function CreateInterface(comparer: IEqualityComparer<K>; capacity: integer = 0):
IOmniLockManager<K>; overload;
constructor Create(capacity: integer = 0); overload;
constructor Create(const comparer: IEqualityComparer<K>; capacity: integer = 0); overload;
destructor Destroy; override;
function Lock(const key: K; timeout_ms: cardinal): boolean;
function LockUnlock(const key: K; timeout_ms: cardinal): IOmniLockManagerAutoUnlock;
function Unlock(const key: K): boolean;
end; { TOmniLockManager<K> }
{$ENDIF OTL_Generics}
function CreateOmniCriticalSection: IOmniCriticalSection;
function CreateOmniCancellationToken: IOmniCancellationToken;
function CreateResourceCount(initialCount: integer): IOmniResourceCount;
procedure NInterlockedExchangeAdd(var addend; value: NativeInt);
function CAS8(const oldValue, newValue: byte; var destination): boolean;
function CAS16(const oldValue, newValue: word; var destination): boolean;
function CAS32(const oldValue, newValue: cardinal; var destination): boolean; overload;
{$IFNDEF CPUX64}
function CAS32(const oldValue: pointer; newValue: pointer; var destination): boolean; overload;
{$ENDIF ~CPUX64}
function CAS64(const oldData, newData: int64; var destination): boolean; overload;
function CAS(const oldValue, newValue: NativeInt; var destination): boolean; overload;
function CAS(const oldValue, newValue: pointer; var destination): boolean; overload;
function CAS(const oldData: pointer; oldReference: NativeInt; newData: pointer;
newReference: NativeInt; var destination): boolean; overload;
{$IFNDEF CPUX64}
procedure Move64(var Source, Destination); overload;
procedure Move64(newData: pointer; newReference: cardinal; var Destination); overload;
{$ENDIF ~CPUX64}
procedure Move128(var Source, Destination);
procedure MoveDPtr(var Source, Destination); overload;
procedure MoveDPtr(newData: pointer; newReference: NativeInt; var Destination); overload;
function GetThreadId: NativeInt;
function GetCPUTimeStamp: int64;
var
GOmniCancellationToken: IOmniCancellationToken;
CASAlignment: integer; //required alignment for the CAS function - 8 or 16, depending on the platform
implementation
uses
Windows,
TypInfo;
type
TOmniCriticalSection = class(TInterfacedObject, IOmniCriticalSection)
strict private
ocsCritSect : TSynchroObject;
ocsLockCount: integer;
public
constructor Create;
destructor Destroy; override;
procedure Acquire; inline;
function GetLockCount: integer;
function GetSyncObj: TSynchroObject;
procedure Release; inline;
end; { TOmniCriticalSection }
TOmniCancellationToken = class(TInterfacedObject, IOmniCancellationToken)
private
octEvent : TDSiEventHandle;
octIsSignalled: boolean;
protected
function GetHandle: THandle; inline;
public
constructor Create;
destructor Destroy; override;
procedure Clear; inline;
function IsSignalled: boolean; inline;
procedure Signal; inline;
property Handle: THandle read GetHandle;
end; { TOmniCancellationToken }
{ exports }
function CreateOmniCriticalSection: IOmniCriticalSection;
begin
Result := TOmniCriticalSection.Create;
end; { CreateOmniCriticalSection }
function CreateOmniCancellationToken: IOmniCancellationToken;
begin
Result := TOmniCancellationToken.Create;
end; { CreateOmniCancellationToken }
function CreateResourceCount(initialCount: integer): IOmniResourceCount;
begin
Result := TOmniResourceCount.Create(initialCount);
end; { CreateResourceCount }
function CAS8(const oldValue, newValue: byte; var destination): boolean;
asm
{$IFDEF CPUX64}
mov al, oldValue
{$ENDIF CPUX64}
lock cmpxchg [destination], dl
setz al
end; { CAS8 }
function CAS16(const oldValue, newValue: word; var destination): boolean;
asm
{$IFDEF CPUX64}
mov ax, oldValue
{$ENDIF CPUX64}
lock cmpxchg [destination], dx
setz al
end; { CAS16 }
function CAS32(const oldValue, newValue: cardinal; var destination): boolean; overload;
asm
{$IFDEF CPUX64}
mov eax, oldValue
{$ENDIF CPUX64}
lock cmpxchg [destination], edx
setz al
end; { CAS32 }
{$IFNDEF CPUX64}
function CAS32(const oldValue: pointer; newValue: pointer; var destination): boolean; overload;
asm
//{$IFDEF CPUX64}
mov eax, oldValue
//{$ENDIF CPUX64}
lock cmpxchg [destination], edx
setz al
end; { CAS32 }
{$ENDIF ~CPUX64}
function CAS64(const oldData, newData: int64; var destination): boolean; overload;
asm
{$IFNDEF CPUX64}
push edi
push ebx
mov edi, destination
mov ebx, low newData
mov ecx, high newData
mov eax, low oldData
mov edx, high oldData
lock cmpxchg8b [edi]
pop ebx
pop edi
{$ELSE CPUX64}
mov rax, oldData
lock cmpxchg [destination], newData
{$ENDIF ~CPUX64}
setz al
end; { CAS64 }
function CAS(const oldValue, newValue: NativeInt; var destination): boolean; overload;
asm
{$IFDEF CPUX64}
mov rax, oldValue
{$ENDIF CPUX64}
lock cmpxchg [destination], newValue
setz al
end; { CAS }
function CAS(const oldValue, newValue: pointer; var destination): boolean; overload;
asm
{$IFDEF CPUX64}
mov rax, oldValue
{$ENDIF CPUX64}
lock cmpxchg [destination], newValue
setz al
end; { CAS }
//eighter 8-byte or 16-byte CAS, depending on the platform; destination must be propely aligned (8- or 16-byte)
function CAS(const oldData: pointer; oldReference: NativeInt; newData: pointer;
newReference: NativeInt; var destination): boolean; overload;
asm
{$IFNDEF CPUX64}
push edi
push ebx
mov ebx, newData
mov ecx, newReference
mov edi, destination
lock cmpxchg8b qword ptr [edi]
pop ebx
pop edi
{$ELSE CPUX64}
.noframe
push rbx //rsp := rsp - 8 !
mov rax, oldData
mov rbx, newData
mov rcx, newReference
mov r8, [destination + 8] //+8 with respect to .noframe
lock cmpxchg16b [r8]
pop rbx
{$ENDIF CPUX64}
setz al
end; { CAS }
{$IFNDEF CPUX64}
procedure Move64(var Source, Destination); overload;
//Move 8 bytes atomicly from Source 8-byte aligned to Destination!
asm
movq xmm0, qword [Source]
movq qword [Destination], xmm0
end;
procedure Move64(newData: pointer; newReference: cardinal; var Destination); overload;
//Move 8 bytes atomically into 8-byte Destination!
asm
movd xmm0, eax
movd xmm1, edx
punpckldq xmm0, xmm1
movq qword [Destination], xmm0
end; { Move64 }
{$ENDIF ~CPUX64}
procedure Move128(var Source, Destination);
//Move 16 bytes atomically from Source to 16-byte aligned to Destination!
asm
{$IFNDEF CPUX64}
movdqa xmm0, dqword [Source]
movdqa dqword [Destination], xmm0
{$ELSE CPUX64}
//Move 16 bytes atomically into 16-byte Destination!
push rbx
mov r8, destination
mov rbx, [Source]
mov rcx, [Source + 8]
mov rax, [r8]
mov rdx, [r8 + 8]
@repeat:
lock cmpxchg16B [r8]
jnz @repeat
pop rbx
{$ENDIF CPUX64}
end; { Move128 }
//eighter 8-byte or 16-byte atomic Move, depending on the platform; destination must be propely aligned (8- or 16-byte)
procedure MoveDPtr(newData: pointer; newReference: NativeInt; var Destination); overload;
asm
{$IFNDEF CPUX64}
movd xmm0, eax
movd xmm1, edx
punpckldq xmm0, xmm1
movq qword [Destination], xmm0
mov eax, [eax + $24]
{$ELSE CPUX64}
//Move 16 bytes atomically into 16-byte Destination!
push rbx
mov r8, destination
mov rbx, newData
mov rcx, newReference
mov rax, [r8]
mov rdx, [r8 + 8]
@repeat:
lock cmpxchg16B [r8]
jnz @repeat
pop rbx
{$ENDIF CPUX64}
end; { MoveDPtr }
//eighter 8-byte or 16-byte atomic Move, depending on the platform; destination must be propely aligned (8- or 16-byte)
procedure MoveDPtr(var Source, Destination);
asm
{$IFNDEF CPUX64}
//Move 8 bytes atomically from Source 8-byte aligned to Destination!
movq xmm0, qword [Source]
movq qword [Destination], xmm0
{$ELSE CPUX64}
//Move 16 bytes atomically into 16-byte Destination!
push rbx
mov r8, destination
mov rbx, [Source]
mov rcx, [Source + 8]
mov rax, [r8]
mov rdx, [r8 + 8]
@repeat:
lock cmpxchg16B [r8]
jnz @repeat
pop rbx
{$ENDIF CPUX64}
end;
function GetThreadId: NativeInt;
//result := GetCurrentThreadId;
asm
{$IFNDEF CPUX64}
mov eax, fs:[$18] //eax := thread information block
mov eax, [eax + $24] //eax := thread id
{$ELSE CPUX64}
mov rax, gs:[abs $30]
mov eax, [rax + $48]
{$ENDIF CPUX64}
end; { GetThreadId }
function GetCPUTimeStamp: int64;
asm
rdtsc
{$IFDEF CPUX64}
shl rdx, 32
or rax, rdx
{$ENDIF CPUX64}
end; { GetCPUTimeStamp }
procedure NInterlockedExchangeAdd(var addend; value: NativeInt);
asm
lock xadd [addend], value
end; { NInterlockedExchangeAdd }
{$IFNDEF OTL_HasInterlockedCompareExchangePointer}
function InterlockedCompareExchangePointer(var destination: pointer; exchange: pointer;
comparand: pointer): pointer;
begin
Result := pointer(InterlockedCompareExchange(integer(destination), integer(exchange),
integer(comparand)));
end; { InterlockedCompareExchangePointer }
{$ENDIF OTL_HasInterlockedCompareExchangePointer}
procedure MFence; assembler;
asm
mfence
end; { MFence }
{ TOmniCS }
procedure TOmniCS.Acquire;
begin
Initialize;
ocsSync.Acquire;
end; { TOmniCS.Acquire }
function TOmniCS.GetLockCount: integer;
begin
Result := ocsSync.LockCount;
end; { TOmniCS.GetLockCount }
function TOmniCS.GetSyncObj: TSynchroObject;
begin
Initialize;
Result := ocsSync.GetSyncObj;
end; { TOmniCS.GetSyncObj }
procedure TOmniCS.Initialize;
var
syncIntf: IOmniCriticalSection;
begin
Assert(cardinal(@ocsSync) mod SizeOf(pointer) = 0, 'TOmniCS.Initialize: ocsSync is not properly aligned!');
Assert(cardinal(@syncIntf) mod SizeOf(pointer) = 0, 'TOmniCS.Initialize: syncIntf is not properly aligned!');
if not assigned(ocsSync) then begin
syncIntf := CreateOmniCriticalSection;
if CAS(nil, pointer(syncIntf), ocsSync) then
pointer(syncIntf) := nil;
end;
end; { TOmniCS.Initialize }
procedure TOmniCS.Release;
begin
ocsSync.Release;
end; { TOmniCS.Release }
{ TOmniCriticalSection }
constructor TOmniCriticalSection.Create;
begin
ocsCritSect := TFixedCriticalSection.Create;
end; { TOmniCriticalSection.Create }
destructor TOmniCriticalSection.Destroy;
begin
FreeAndNil(ocsCritSect);
end; { TOmniCriticalSection.Destroy }
procedure TOmniCriticalSection.Acquire;
begin
ocsCritSect.Acquire;
Inc(ocsLockCount);
end; { TOmniCriticalSection.Acquire }
function TOmniCriticalSection.GetLockCount: integer;
begin
Result := ocsLockCount;
end; { TOmniCriticalSection.GetLockCount }
function TOmniCriticalSection.GetSyncObj: TSynchroObject;
begin
Result := ocsCritSect;
end; { TOmniCriticalSection.GetSyncObj }
procedure TOmniCriticalSection.Release;
begin
ocsCritSect.Release;
Dec(ocsLockCount);
end; { TOmniCriticalSection.Release }
{ TOmniCancellationToken }
constructor TOmniCancellationToken.Create;
begin
octEvent := CreateEvent(nil, true, false, nil);
end; { TOmniCancellationToken.Create }
destructor TOmniCancellationToken.Destroy;
begin
DSiCloseHandleAndNull(octEvent);
end; { TOmniCancellationToken.Destroy }
procedure TOmniCancellationToken.Clear;
begin
octIsSignalled := false;
ResetEvent(octEvent);
end; { TOmniCancellationToken.Clear }
function TOmniCancellationToken.GetHandle: THandle;
begin
Result := octEvent;
end; { TOmniCancellationToken.GetHandle }
function TOmniCancellationToken.IsSignalled: boolean;
begin
Result := octIsSignalled;
end; { TOmniCancellationToken.IsSignalled }
procedure TOmniCancellationToken.Signal;
begin
octIsSignalled := true;
SetEvent(octEvent);
end; { TOmniCancellationToken.Signal }
{ TOmniMREW }
procedure TOmniMREW.EnterReadLock;
var
currentReference: NativeInt;
begin
//Wait on writer to reset write flag so Reference.Bit0 must be 0 than increase Reference
repeat
currentReference := NativeInt(omrewReference) AND NOT 1;
until CAS(currentReference, currentReference + 2, NativeInt(omrewReference));
end; { TOmniMREW.EnterReadLock }
procedure TOmniMREW.EnterWriteLock;
var
currentReference: NativeInt;
begin
//Wait on writer to reset write flag so omrewReference.Bit0 must be 0 then set omrewReference.Bit0
repeat
currentReference := NativeInt(omrewReference) AND NOT 1;
until CAS(currentReference, currentReference + 1, NativeInt(omrewReference));
//Now wait on all readers
repeat
until NativeInt(omrewReference) = 1;
end; { TOmniMREW.EnterWriteLock }
procedure TOmniMREW.ExitReadLock;
begin
//Decrease omrewReference
NInterlockedExchangeAdd(NativeInt(omrewReference), -2);
end; { TOmniMREW.ExitReadLock }
procedure TOmniMREW.ExitWriteLock;
begin
NativeInt(omrewReference) := 0;
end; { TOmniMREW.ExitWriteLock }
{ TOmniResourceCount }
constructor TOmniResourceCount.Create(initialCount: cardinal);
begin
inherited Create;
orcHandle := CreateEvent(nil, true, (initialCount = 0), nil);
orcAvailable := CreateEvent(nil, true, (initialCount <> 0), nil);
orcNumResources.Value := initialCount;
end; { TOmniResourceCount.Create }
destructor TOmniResourceCount.Destroy;
begin
DSiCloseHandleAndNull(orcHandle);
DSiCloseHandleAndNull(orcAvailable);
inherited;
end; { TOmniResourceCount.Destroy }
///<summary>Allocates resource and returns number of remaining resources.
/// If the initial number of resources is 0, then the call will block until a resource
/// becomes available.
/// If there are no remaining resources (Result is 0), sets externally visible event.
///</summary>
function TOmniResourceCount.Allocate: cardinal;
begin
TryAllocate(Result, INFINITE);
end; { TOmniResourceCount.Allocate }
function TOmniResourceCount.GetHandle: THandle;
begin
Result := orcHandle;
end; { TOmniResourceCount.GetHandle }
///<summary>Releases resource and returns number of remaining resources.
/// Resets the externally visible event if necessary.
///</summary>
function TOmniResourceCount.Release: cardinal;
begin
orcLock.Acquire;
try
Result := cardinal(orcNumResources.Increment);
if Result = 1 then begin
ResetEvent(orcHandle);
SetEvent(orcAvailable);
end;
finally orcLock.Release; end;
end; { TOmniResourceCount.Release }
///<summary>Like Allocate, but with a timeout.</summary>
function TOmniResourceCount.TryAllocate(var resourceCount: cardinal;
timeout_ms: cardinal): boolean;
var
startTime_ms: int64;
waitTime_ms : int64;
begin
Result := false;
startTime_ms := DSiTimeGetTime64;
orcLock.Acquire;
repeat
if orcNumResources.Value = 0 then begin
orcLock.Release;
if timeout_ms <= 0 then
Exit;
if timeout_ms = INFINITE then
waitTime_ms := INFINITE
else begin
waitTime_ms := startTime_ms + timeout_ms - DSiTimeGetTime64;
if waitTime_ms <= 0 then
Exit;
end;
if WaitForSingleObject(orcAvailable, waitTime_ms) <> WAIT_OBJECT_0 then
Exit; // skip final Release
orcLock.Acquire;
end;
if orcNumResources.Value > 0 then begin
Result := true;
resourceCount := cardinal(orcNumResources.Decrement);
if resourceCount = 0 then begin
orcLock.Release; //prevent race condition - another thread may wait on orcHandle and destroy this instance
ResetEvent(orcAvailable);
SetEvent(orcHandle);
Exit; // skip final Release
end;
break; //repeat
end;
until false;
orcLock.Release;
end; { TOmniResourceCount.TryAllocate }
{$IFDEF OTL_Generics}
{ Atomic<T> }
class function Atomic<T>.Initialize(var storage: T; factory: TFactory): T;
var
interlockRes: pointer;
tmpT : T;
begin
if not assigned(PPointer(@storage)^) then begin
Assert(cardinal(@storage) mod SizeOf(pointer) = 0, 'Atomic<T>.Initialize: storage is not properly aligned!');
Assert(cardinal(@tmpT) mod SizeOf(pointer) = 0, 'Atomic<T>.Initialize: tmpT is not properly aligned!');
tmpT := factory();
interlockRes := InterlockedCompareExchangePointer(PPointer(@storage)^, PPointer(@tmpT)^, nil);
case PTypeInfo(TypeInfo(T))^.Kind of
tkInterface:
if interlockRes = nil then
PPointer(@tmpT)^ := nil;
tkClass:
if interlockRes <> nil then
TObject(PPointer(@tmpT)^).Free;
else
raise Exception.Create('Atomic<T>.Initialize: Unsupported type');
end; //case
end;
Result := storage;
end; { Atomic<T>.Initialize }
{$IFDEF OTL_ERTTI}
class function Atomic<T>.Initialize(var storage: T): T;
begin
if not assigned(PPointer(@storage)^) then begin
if PTypeInfo(TypeInfo(T))^.Kind <> tkClass then
raise Exception.Create('Atomic<T>.Initialize: Unsupported type');
Result := Atomic<T>.Initialize(storage,
function: T
var
aMethCreate : TRttiMethod;
instanceType: TRttiInstanceType;
ctx : TRttiContext;
resValue : TValue;
rType : TRttiType;
begin
ctx := TRttiContext.Create;
rType := ctx.GetType(TypeInfo(T));
for aMethCreate in rType.GetMethods do begin
if (aMethCreate.IsConstructor) and (Length(aMethCreate.GetParameters) = 0) then begin
instanceType := rType.AsInstance;
resValue := AMethCreate.Invoke(instanceType.MetaclassType, []);
Result := resValue.AsType<T>;
break; //for
end;
end; //for
end);
end;
end; { Atomic<T>.Initialize }
{$ENDIF OTL_ERTTI}
{ Locked<T> }
constructor Locked<T>.Create(const value: T; ownsObject: boolean);
begin
Clear;
FValue := value;
if ownsObject and (PTypeInfo(TypeInfo(T))^.Kind = tkClass) then
FLifecycle := AutoDestroyObject(TObject(PPointer(@value)^));
FInitialized := true;
FLockCount := 0;
end; { Locked<T>.Create }
class operator Locked<T>.Implicit(const value: Locked<T>): T;
begin
Result := value.Value;
end; { Locked<T>.Implicit }
class operator Locked<T>.Implicit(const value: T): Locked<T>;
begin
Result := Locked<T>.Create(value);
end; { Locked<T>.Implicit }
procedure Locked<T>.Acquire;
begin
FLock.Acquire;
end; { Locked<T>.Acquire }
procedure Locked<T>.Clear;
begin
FLifecycle := nil;
FInitialized := false;
FValue := Default(T);
FOwnsObject := false;
end; { Locked }
procedure Locked<T>.Free;
begin
if FInitialized then begin
Acquire;
try
if FInitialized then begin
if (PTypeInfo(TypeInfo(T))^.Kind = tkClass) then
TObject(PPointer(@FValue)^).Free;
Clear;
end;
finally Release; end;
end;
end; { Locked<T>.Free }
function Locked<T>.GetValue: T;
begin
Assert(FLock.LockCount > 0, 'Locked<T>.GetValue: Not locked');
Result := FValue;
end; { Locked<T>.GetValue }
function Locked<T>.Initialize(factory: TFactory): T;
begin
if not FInitialized then begin
Acquire;
try
if not FInitialized then begin
FValue := factory();
//MFence; // not needed on x86 and x64, see comments to http://www.thedelphigeek.com/2011/12/on-optimistic-and-pessimistic.html
FInitialized := true;
end;
finally Release; end;
end;
Result := FValue;
end; { Locked<T>.Initialize }
{$IFDEF OTL_ERTTI}
function Locked<T>.Initialize: T;
begin
if not FInitialized then begin
if PTypeInfo(TypeInfo(T))^.Kind <> tkClass then
raise Exception.Create('Locked<T>.Initialize: Unsupported type');
Result := Initialize(
function: T
var
aMethCreate : TRttiMethod;
instanceType: TRttiInstanceType;
ctx : TRttiContext;
params : TArray<TRttiParameter>;
resValue : TValue;
rType : TRttiType;
begin
ctx := TRttiContext.Create;
rType := ctx.GetType(TypeInfo(T));
for aMethCreate in rType.GetMethods do begin
if aMethCreate.IsConstructor then begin
params := aMethCreate.GetParameters;
if Length(params) = 0 then begin
instanceType := rType.AsInstance;
resValue := AMethCreate.Invoke(instanceType.MetaclassType, []);
Result := resValue.AsType<T>;
break; //for
end;
end;
end; //for
end);