hedgewars/uFLIPC.pas
author unc0rr
Mon, 25 Dec 2017 00:58:47 +0100
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unit uFLIPC;
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interface
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uses SDLh, uFLTypes;
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procedure initIPC;
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procedure freeIPC;
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procedure ipcToEngine(s: shortstring);
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procedure ipcToEngineRaw(p: pointer; len: Longword); cdecl;
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procedure ipcSetEngineBarrier(); cdecl;
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procedure ipcRemoveBarrierFromEngineQueue(); cdecl;
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//function  ipcReadFromEngine: shortstring;
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//function  ipcCheckFromEngine: boolean;
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procedure ipcToFrontend(s: shortstring);
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procedure ipcToFrontendRaw(p: pointer; len: Longword);
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function ipcReadFromFrontend: TIPCMessage;
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function ipcCheckFromFrontend: boolean;
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procedure registerIPCCallback(p: pointer; f: TIPCCallback);
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implementation
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var callbackPointerF: pointer;
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    callbackFunctionF: TIPCCallback;
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    callbackListenerThreadF: PSDL_Thread;
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    queueFrontend, queueEngine: PIPCQueue;
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procedure ipcSend(var s: TIPCMessage; queue: PIPCQueue);
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var pmsg: PIPCMessage;
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begin
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    SDL_LockMutex(queue^.mut);
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    s.next:= nil;
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    s.barrier:= 0;
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    if (queue^.msg.next = nil) and (queue^.msg.str[0] = #0) and (queue^.msg.buf = nil) and (queue^.msg.barrier = 0) then
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    begin
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        queue^.msg:= s;
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    end else
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    begin
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        new(pmsg);
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        pmsg^:= s;
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        queue^.last^.next:= pmsg;
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        queue^.last:= pmsg;
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    end;
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    SDL_CondSignal(queue^.cond);
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    SDL_UnlockMutex(queue^.mut);
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end;
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function ipcRead(queue: PIPCQueue): TIPCMessage;
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var pmsg: PIPCMessage;
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begin
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    SDL_LockMutex(queue^.mut);
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    while ((queue^.msg.str[0] = #0) and (queue^.msg.buf = nil))
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            and ((queue^.msg.barrier > 0) or (queue^.msg.next = nil) or ((queue^.msg.next^.barrier > 0) and (queue^.msg.next^.str[0] = #0) and (queue^.msg.next^.buf = nil))) do
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        SDL_CondWait(queue^.cond, queue^.mut);
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    if (queue^.msg.str[0] <> #0) or (queue^.msg.buf <> nil) then
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        begin
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            ipcRead:= queue^.msg;
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            queue^.msg.str[0]:= #0;
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            queue^.msg.buf:= nil;
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        end else
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        begin
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            pmsg:= queue^.msg.next;
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            ipcRead:= pmsg^;
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            if pmsg^.barrier > 0 then
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            begin
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                pmsg^.str[0]:= #0;
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                pmsg^.buf:= nil
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            end else
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            begin
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                queue^.msg.next:= pmsg^.next;
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                if queue^.msg.next = nil then queue^.last:= @queue^.msg;
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                dispose(pmsg)
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            end
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        end;
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    SDL_UnlockMutex(queue^.mut)
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end;
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function ipcCheck(queue: PIPCQueue): boolean;
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begin
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    SDL_LockMutex(queue^.mut);
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    ipcCheck:= (queue^.msg.str[0] > #0) or (queue^.msg.buf <> nil) or
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               ((queue^.msg.barrier = 0) and (queue^.msg.next <> nil) and ((queue^.msg.next^.barrier = 0) or (queue^.msg.next^.str[0] <> #0) or (queue^.msg.next^.buf <> nil)));
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    SDL_UnlockMutex(queue^.mut)
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end;
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procedure ipcToEngine(s: shortstring);
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var msg: TIPCMessage;
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begin
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    msg.str:= s;
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    msg.buf:= nil;
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    ipcSend(msg, queueEngine)
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end;
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procedure ipcToFrontend(s: shortstring);
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var msg: TIPCMessage;
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begin
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    msg.str:= s;
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    msg.buf:= nil;
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    ipcSend(msg, queueFrontend)
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end;
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procedure ipcSetEngineBarrier(); cdecl;
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begin
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    SDL_LockMutex(queueEngine^.mut);
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    inc(queueEngine^.last^.barrier);
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    SDL_UnlockMutex(queueEngine^.mut);
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end;
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procedure ipcRemoveBarrierFromEngineQueue(); cdecl;
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var pmsg, t: PIPCMessage;
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    q: PIPCQueue;
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begin
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    q:= queueEngine;
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    SDL_LockMutex(q^.mut);
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    pmsg:= @q^.msg;
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    while pmsg <> nil do
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    begin
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        t:= pmsg^.next;
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        q^.msg.next:= t;
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        pmsg^.str[0]:= #0;
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        if pmsg^.buf <> nil then
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        begin
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            FreeMem(pmsg^.buf, pmsg^.len);
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            pmsg^.buf:= nil
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        end;
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        if pmsg <> @q^.msg then
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            if pmsg^.barrier = 0 then
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                dispose(pmsg)
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            else
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            if pmsg^.barrier = 1 then
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            begin
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                dispose(pmsg);
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                t:= nil
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            end else
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            begin
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                dec(pmsg^.barrier);
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                q^.msg.next:= pmsg;
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                t:= nil
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            end
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        else
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            if pmsg^.barrier > 0 then 
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            begin
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                dec(pmsg^.barrier);
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                t:= nil
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            end;
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        pmsg:= t
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    end;
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    if q^.msg.next = nil then q^.last:= @q^.msg;
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    q^.msg.str[0]:= #0;
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    q^.msg.buf:= nil;
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    SDL_UnlockMutex(q^.mut);
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end;
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procedure ipcToEngineRaw(p: pointer; len: Longword); cdecl;
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var msg: TIPCMessage;
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begin
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    msg.str[0]:= #0;
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    msg.len:= len;
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    msg.buf:= GetMem(len);
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    Move(p^, msg.buf^, len);
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    ipcSend(msg, queueEngine)
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end;
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procedure ipcToFrontendRaw(p: pointer; len: Longword);
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var msg: TIPCMessage;
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begin
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    msg.str[0]:= #0;
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    msg.len:= len;
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    msg.buf:= GetMem(len);
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    Move(p^, msg.buf^, len);
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    ipcSend(msg, queueFrontend)
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end;
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function ipcReadFromEngine: TIPCMessage;
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begin
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    ipcReadFromEngine:= ipcRead(queueFrontend)
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end;
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function ipcReadFromFrontend: TIPCMessage;
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begin
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    ipcReadFromFrontend:= ipcRead(queueEngine)
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end;
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function ipcCheckFromEngine: boolean;
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begin
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    ipcCheckFromEngine:= ipcCheck(queueFrontend)
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end;
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function ipcCheckFromFrontend: boolean;
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begin
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    ipcCheckFromFrontend:= ipcCheck(queueEngine)
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end;
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function  engineListener(p: pointer): Longint; cdecl; export;
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var msg: TIPCMessage;
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begin
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    engineListener:= 0;
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    repeat
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        msg:= ipcReadFromEngine();
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        if msg.buf = nil then
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            callbackFunctionF(callbackPointerF, @msg.str[1], byte(msg.str[0]))
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        else
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        begin
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            callbackFunctionF(callbackPointerF, msg.buf, msg.len);
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            FreeMem(msg.buf, msg.len)
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        end
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    until false
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end;
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procedure registerIPCCallback(p: pointer; f: TIPCCallback);
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begin
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    callbackPointerF:= p;
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    callbackFunctionF:= f;
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    callbackListenerThreadF:= SDL_CreateThread(@engineListener, 'engineListener', nil);
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end;
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function createQueue: PIPCQueue;
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var q: PIPCQueue;
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begin
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    new(q);
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    q^.msg.str:= '';
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    q^.msg.buf:= nil;
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    q^.msg.barrier:= 0;
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    q^.mut:= SDL_CreateMutex;
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    q^.cond:= SDL_CreateCond;
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    q^.msg.next:= nil;
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    q^.last:= @q^.msg;
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    createQueue:= q
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end;
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procedure destroyQueue(queue: PIPCQueue);
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begin
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    SDL_DestroyCond(queue^.cond);
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    SDL_DestroyMutex(queue^.mut);
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    dispose(queue);
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end;
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procedure initIPC;
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begin
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    queueFrontend:= createQueue;
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    queueEngine:= createQueue;
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    callbackPointerF:= nil;
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    callbackListenerThreadF:= nil;
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end;
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procedure freeIPC;
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begin
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    //FIXME SDL_KillThread(callbackListenerThreadF);
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    destroyQueue(queueFrontend);
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    destroyQueue(queueEngine);
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end;
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end.