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type
TThreadEntryfunction = function(data: Pointer): Pointer; cdecl;
TMutextKind = (mkExclusive, mkShared);
TAROSMutex = record
Semaphore: TSignalSemaphore;
end;
PAROSMutex = ^TAROSMutex;
TCondition = record
Lock: TSignalSemaphore;
Waiters: array of Pointer;
end;
PCondition = ^TCondition;
TAROSThread = record
Entry: TThreadEntryfunction;
Data: Pointer;
ThreadID: LongWord;
Priority: LongInt;
StackSize: LongInt;
Task: PProcess;
Lock: TSignalSemaphore;
StartupSemaphore: TSignalSemaphore;
EndCondition: PCondition;
EndMutex: PAROSMutex;
EndCount: Integer;
end;
PAROSThread = ^TAROSThread;
TAROSThreadStruct = record
MutexListSem: TSignalSemaphore;
MutexList: array of PAROSMutex;
//
ThreadListSem: TSignalSemaphore;
ThreadList: array of PAROSThread;
//
ConditionListSem: TSignalSemaphore;
ConditionList: array of PCondition;
//
ThreadMemSem: TSignalSemaphore;
EmptySemaphore: TSignalSemaphore;
//
LastThreadNum: LongWord;
end;
PAROSThreadStruct = ^TAROSThreadStruct;
var
AROSThreadStruct: PAROSThreadStruct external name 'AROS_THREADLIB';
function CreateNewProcTags(const Tags: array of PtrUInt): PProcess;
begin
CreateNewProcTags := CreateNewProc(@Tags[0]);
end;
// Mutexe
function CreateMutex: PAROSMutex;
var
Mutex: PAROSMutex;
Idx, i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
New(Mutex);
InitSemaphore(@(Mutex^.Semaphore));
ObtainSemaphore(@(AROSThreadStruct^.MutexListSem));
Idx := -1;
for i := 0 to High(AROSThreadStruct^.MutexList) do
begin
if not Assigned(AROSThreadStruct^.MutexList[i]) then
begin
Idx := i;
Break;
end;
end;
if Idx < 0 then
begin
Idx := Length(AROSThreadStruct^.MutexList);
SetLength(AROSThreadStruct^.MutexList, Idx + 1);
end;
AROSThreadStruct^.MutexList[Idx] := Mutex;
ReleaseSemaphore(@(AROSThreadStruct^.MutexListSem));
Result := Mutex;
end;
procedure DestroyMutex(Mutex: PAROSMutex);
var
i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
ObtainSemaphore(@(AROSThreadStruct^.MutexListSem));
for i := 0 to High(AROSThreadStruct^.MutexList) do
begin
if AROSThreadStruct^.MutexList[i] = Mutex then
begin
FillChar(Mutex^.Semaphore, SizeOf(TSignalSemaphore), 0);
Dispose(Mutex);
AROSThreadStruct^.MutexList[i] := nil;
end;
end;
ReleaseSemaphore(@(AROSThreadStruct^.MutexListSem));
end;
function IsValidMutex(Mutex: PAROSMutex): Boolean;
var
i: Integer;
begin
Result := False;
if not Assigned(AROSThreadStruct) then
Exit;
ObtainSemaphore(@(AROSThreadStruct^.MutexListSem));
for i := 0 to High(AROSThreadStruct^.MutexList) do
begin
if AROSThreadStruct^.MutexList[i] = Mutex then
begin
Result := True;
Break;
end;
end;
ReleaseSemaphore(@(AROSThreadStruct^.MutexListSem));
end;
procedure LockMutex(Mutex: PAROSMutex);
begin
if IsValidMutex(Mutex) then
begin
ObtainSemaphore(@(Mutex^.Semaphore));
end;
end;
function TryLockMutex(Mutex: PAROSMutex): Boolean;
begin
Result := False;
if IsValidMutex(Mutex) then
begin
Result := AttemptSemaphore(@(Mutex^.Semaphore)) <> 0;
end;
end;
procedure UnLockMutex(Mutex: PAROSMutex);
begin
if IsValidMutex(Mutex) then
begin
ReleaseSemaphore(@(Mutex^.Semaphore));
end;
end;
// Conditions
function CreateCondition: PCondition;
var
Idx, i: Integer;
NewCond: PCondition;
begin
if not Assigned(AROSThreadStruct) then
Exit;
New(NewCond);
SetLength(NewCond^.Waiters, 0);
InitSemaphore(@(NewCond^.Lock));
ObtainSemaphore(@(AROSThreadStruct^.ConditionListSem));
Idx := -1;
for i := 0 to High(AROSThreadStruct^.ConditionList) do
begin
if not Assigned(AROSThreadStruct^.ConditionList[i]) then
begin
Idx := i;
Break;
end;
end;
if Idx < 0 then
begin
Idx := Length(AROSThreadStruct^.ConditionList);
SetLength(AROSThreadStruct^.ConditionList, Idx + 1);
end;
AROSThreadStruct^.ConditionList[Idx] := NewCond;
ReleaseSemaphore(@(AROSThreadStruct^.ConditionListSem));
Result := NewCond;
end;
function DestroyCondition(Cond: PCondition): boolean;
var
Idx, i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
ObtainSemaphore(@(Cond^.Lock));
if Length(Cond^.Waiters) > 0 then
begin
ReleaseSemaphore(@(Cond^.Lock));
Result := False;
Exit;
end;
ObtainSemaphore(@(AROSThreadStruct^.ConditionListSem));
Idx := -1;
for i := 0 to High(AROSThreadStruct^.ConditionList) do
begin
if AROSThreadStruct^.ConditionList[i] = Cond then
begin
AROSThreadStruct^.ConditionList[i] := nil;
Dispose(Cond);
Break;
end;
end;
ReleaseSemaphore(@(AROSThreadStruct^.ConditionListSem));
Result := True;
end;
function WaitCondition(Cond: PCondition; Mutex: PAROSMutex): boolean;
var
Idx: Integer;
begin
if (not Assigned(Cond)) or (not Assigned(Mutex)) then
begin
Result := False;
Exit;
end;
ObtainSemaphore(@Cond^.Lock);
Idx := Length(Cond^.Waiters);
SetLength(Cond^.Waiters, Idx + 1);
Cond^.Waiters[Idx] := FindTask(nil);
ReleaseSemaphore(@Cond^.Lock);
Forbid();
UnLockMutex(Mutex);
Wait(SIGF_SINGLE);
Permit();
LockMutex(Mutex);
Result := True;
end;
procedure SignalCondition(Cond: PCondition);
var
Waiter: PTask;
Idx: Integer;
begin
if not Assigned(Cond) then
Exit;
ObtainSemaphore(@Cond^.Lock);
Waiter := nil;
//debugln(' found ' + IntToStr(Cond^.Waiters.Count) + ' Waiter');
if Length(Cond^.Waiters) > 0 then
begin
Idx := High(Cond^.Waiters);
Waiter := Cond^.Waiters[Idx];
SetLength(Cond^.Waiters, Idx);
end;
ReleaseSemaphore(@Cond^.Lock);
if not Assigned(Waiter) then
begin
//debugln('Waiter not assigned');
Exit;
end;
//debugln('Signal Waiter');
Signal(Waiter, SIGF_SINGLE);
end;
procedure BroadcastCondition(Cond: PCondition);
var
Waiter: PTask;
I: Integer;
begin
if not Assigned(Cond) then
Exit;
Waiter := nil;
ObtainSemaphore(@Cond^.Lock);
for i := 0 to High(Cond^.Waiters) do
begin
Waiter := Cond^.Waiters[i];
Signal(Waiter, SIGF_SINGLE);
end;
SetLength(Cond^.Waiters, 0);
ReleaseSemaphore(@Cond^.Lock);
end;
// Threads
procedure StarterFunc; cdecl;
var
NewThread: PAROSThread;
StackMem: Pointer;
sswap: TStackSwapStruct;
Proc: PTask;
begin
Proc := FindTask(nil);
NewThread := PAROSThread(Proc^.tc_UserData);
// create New Stack
StackMem := GetMem(NewThread^.StackSize);
sswap.stk_Lower := StackMem;
sswap.stk_Upper := Pointer(PtrUInt(sswap.stk_Lower) + NewThread^.StackSize);
sswap.stk_Pointer := sswap.stk_Upper;
ReleaseSemaphore(@AROSThreadStruct^.ThreadMemSem);
// semaphore against too fast startup
ReleaseSemaphore(@(NewThread^.StartupSemaphore));
// swap stack, run program, swap stack back
Stackswap(@sswap);
NewThread^.Entry(NewThread^.Data);
Stackswap(@sswap);
//debugln('5');
// Free stack memory
ObtainSemaphore(@AROSThreadStruct^.ThreadMemSem);
FreeMem(StackMem);
ReleaseSemaphore(@AROSThreadStruct^.ThreadMemSem);
// finished mark as finished
ObtainSemaphore(@NewThread^.Lock);
NewThread^.Task := nil;
ReleaseSemaphore(@NewThread^.Lock);
// tell the others we are finished!
//Debugln('wait for end ' + IntToStr(NewThread^.ThreadId));
LockMutex(NewThread^.EndMutex);
BroadcastCondition(NewThread^.EndCondition);
UnLockMutex(NewThread^.EndMutex);
//Debugln('End ' + IntToStr(NewThread^.ThreadId));
end;
procedure EmptyFunc;
begin
Delay(1);
ReleaseSemaphore(@AROSThreadStruct^.EmptySemaphore);
end;
function AROSCreateThread(Entry: TThreadEntryfunction; data: Pointer; StackSize: Integer = 262144; Priority: Integer = 0): LongWord;
var
NewThread: PAROSThread;
Idx, i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
New(NewThread);
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
Idx := -1;
for i := 0 to High(AROSThreadStruct^.ThreadList) do
begin
if not Assigned(AROSThreadStruct^.ThreadList[i]) then
begin
Idx := i;
Break;
end;
end;
if Idx < 0 then
begin
Idx := Length(AROSThreadStruct^.ThreadList);
SetLength(AROSThreadStruct^.ThreadList, Idx + 1);
end;
Inc(AROSThreadStruct^.LastThreadNum);
AROSThreadStruct^.ThreadList[Idx] := NewThread;
NewThread^.ThreadID := AROSThreadStruct^.LastThreadNum;
NewThread^.Entry := Entry;
NewThread^.Data := Data;
NewThread^.Priority := Priority;
NewThread^.StackSize := StackSize;
InitSemaphore(@(NewThread^.Lock));
InitSemaphore(@(NewThread^.StartupSemaphore));
NewThread^.EndCondition := CreateCondition;
NewThread^.EndMutex := CreateMutex;
NewThread^.EndCount := 0;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
ObtainSemaphore(@AROSThreadStruct^.ThreadMemSem);
// Semaphore for too fast startup
ObtainSemaphore(@(NewThread^.StartupSemaphore));
// a very ugly Bugfix, for crashing AROS, on the very first Task after reboot
// recheck later if can be removed
if NewThread^.ThreadID = 1 then
begin
//debugln('make empty thread');
ObtainSemaphore(@AROSThreadStruct^.EmptySemaphore);
NewThread^.Task := CreateNewProcTags([
NP_Entry, PtrUInt(@EmptyFunc),
TAG_DONE, TAG_END]);
ObtainSemaphore(@AROSThreadStruct^.EmptySemaphore);
Delay(1);
end;
//
NewThread^.Task := CreateNewProcTags([
NP_Entry, PtrUInt(@StarterFunc),
//NP_Name, PtrUInt(PChar('Thread' + IntToStr(LastThreadNum))),
//NP_StackSize, 10024 * 1024,
NP_Priority, Priority,
NP_UserData, PtrUInt(NewThread),
TAG_DONE, TAG_END]);
Result := NewThread^.ThreadID;
end;
function AROSCurrentThread: LongInt;
var
Task: PProcess;
i: Integer;
begin
Result := 0;
Task := PProcess(FindTask(nil));
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
for i := 0 to High(AROSThreadStruct^.ThreadList) do
begin
if Assigned(AROSThreadStruct^.ThreadList[i]) then
begin
if AROSThreadStruct^.ThreadList[i]^.Task = Task then
begin
Result := AROSThreadStruct^.ThreadList[i]^.ThreadID;
Break;
end;
end;
end;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
end;
function AROSWaitThread(ThreadID: LongWord): Boolean;
var
Thread: PAROSThread;
Idx, i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
Thread := nil;
Idx := -1;
for i := 0 to High(AROSThreadStruct^.ThreadList) do
begin
if Assigned(AROSThreadStruct^.ThreadList[i]) then
begin
if AROSThreadStruct^.ThreadList[i]^.ThreadID = ThreadID then
begin
Thread := AROSThreadStruct^.ThreadList[i];
Idx := i;
break;
end;
end;
end;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
if Thread = nil then
begin
//debugln('Thread not found');
Result := False;
Exit;
end;
// check some
ObtainSemaphore(@Thread^.Lock);
// hmm thats me... I do not wait for myself
if Thread^.Task = PProcess(FindTask(nil)) then
begin
//debugln(' hmm its me :O ' + IntToStr(ThreadID));
ReleaseSemaphore(@Thread^.Lock);
Result := False;
Exit;
end;
// wait that the thread start is finished somehow ;)
ObtainSemaphore(@(Thread^.StartupSemaphore));
ReleaseSemaphore(@(Thread^.StartupSemaphore));
// check if Task is still running
if Thread^.Task <> nil then
begin
Inc(Thread^.EndCount);
ReleaseSemaphore(@Thread^.Lock);
LockMutex(Thread^.EndMutex);
//debugln(' Wait condition ' + IntToStr(ThreadID));
WaitCondition(Thread^.EndCondition, Thread^.EndMutex);
//debugln(' got condition ' + IntToStr(ThreadID));
UnlockMutex(Thread^.EndMutex);
ObtainSemaphore(@Thread^.Lock);
Dec(Thread^.EndCount);
end;
if Thread^.EndCount > 0 then
begin
ReleaseSemaphore(@Thread^.Lock);
Result := True;
Exit;
end;
if Assigned(AROSThreadStruct) then
begin
// destroy Thread
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
AROSThreadStruct^.ThreadList[Idx] := nil;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
end;
DestroyCondition(Thread^.EndCondition);
DestroyMutex(Thread^.EndMutex);
Dispose(Thread);
Result := true;
end;
function AROSCurrentThread: LongWord;
var
i: Integer;
CurTask: PProcess;
begin
if not Assigned(AROSThreadStruct) then
Exit;
Result := 0;
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
CurTask := PProcess(FindTask(nil));
for i := 0 to High(AROSThreadStruct^.ThreadList) do
begin
if Assigned(AROSThreadStruct^.ThreadList[i]) then
begin
if AROSThreadStruct^.ThreadList[i]^.Task = CurTask then
begin
Result := AROSThreadStruct^.ThreadList[i]^.ThreadID;
Break;
end;
end;
end;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
end;
procedure WaitAllThreads;
var
i: Integer;
TID: LongWord;
begin
if not Assigned(AROSThreadStruct) then
Exit;
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
i := 0;
while i <= High(AROSThreadStruct^.ThreadList) do
begin
if Assigned(AROSThreadStruct^.ThreadList[i]) then
begin
TID := AROSThreadStruct^.ThreadList[i]^.ThreadID;
//
ObtainSemaphore(@(AROSThreadStruct^.ThreadList[i]^.StartupSemaphore));
ReleaseSemaphore(@(AROSThreadStruct^.ThreadList[i]^.StartupSemaphore));
//
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
AROSWaitThread(TID);
ObtainSemaphore(@AROSThreadStruct^.ThreadListSem);
end;
Inc(i);
end;
ReleaseSemaphore(@AROSThreadStruct^.ThreadListSem);
end;
{$ifdef THREAD_SYSTEM}
procedure InitThreadLib;
begin
New(AROSThreadStruct);
AROSThreadStruct^.LastThreadNum := 0;
InitSemaphore(@(AROSThreadStruct^.MutexListSem));
InitSemaphore(@(AROSThreadStruct^.ConditionListSem));
InitSemaphore(@(AROSThreadStruct^.ThreadListSem));
InitSemaphore(@(AROSThreadStruct^.ThreadMemSem));
InitSemaphore(@(AROSThreadStruct^.EmptySemaphore));
end;
procedure FinishThreadLib;
var
i: Integer;
begin
if not Assigned(AROSThreadStruct) then
Exit;
WaitAllThreads;
ObtainSemaphore(@AROSThreadStruct^.MutexListSem);
i := 0;
for i := 0 to High(AROSThreadStruct^.MutexList) do
begin
if Assigned(AROSThreadStruct^.MutexList[i]) then
begin
Dispose(AROSThreadStruct^.MutexList[i]);
end;
end;
ReleaseSemaphore(@AROSThreadStruct^.MutexListSem);
ObtainSemaphore(@AROSThreadStruct^.ConditionListSem);
i := 0;
for i := 0 to High(AROSThreadStruct^.ConditionList) do
begin
if Assigned(AROSThreadStruct^.ConditionList[i]) then
begin
Dispose(AROSThreadStruct^.ConditionList[i]);
end;
end;
ReleaseSemaphore(@AROSThreadStruct^.ConditionListSem);
Dispose(AROSThreadStruct);
AROSThreadStruct := nil;
end;
{$endif THREAD_SYSTEM}
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