hedgewars/uFLIPC.pas
author unc0rr
Sun, 28 Sep 2014 00:49:04 +0400
branchqmlfrontend
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unit uFLIPC;
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interface
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uses SDLh, uFLTypes;
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var msgFrontend, msgEngine: TIPCMessage;
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    mutFrontend, mutEngine: PSDL_mutex;
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    condFrontend, condEngine: PSDL_cond;
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procedure initIPC;
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procedure freeIPC;
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procedure ipcToEngine(s: shortstring);
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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: shortstring;
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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 callbackPointer: pointer;
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    callbackFunction: TIPCCallback;
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    callbackListenerThread: PSDL_Thread;
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procedure ipcSend(var s: TIPCMessage; var msg: TIPCMessage; mut: PSDL_mutex; cond: PSDL_cond);
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begin
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    SDL_LockMutex(mut);
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    while (msg.str[0] > #0) or (msg.buf <> nil) do
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        SDL_CondWait(cond, mut);
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    msg:= s;
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    SDL_CondSignal(cond);
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    SDL_UnlockMutex(mut);
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end;
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function ipcRead(var msg: TIPCMessage; mut: PSDL_mutex; cond: PSDL_cond): TIPCMessage;
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var tmp: pointer;
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begin
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    SDL_LockMutex(mut);
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    while (msg.str[0] = #0) and (msg.buf = nil) do
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        SDL_CondWait(cond, mut);
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    if msg.buf <> nil then
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    begin
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        tmp:= msg.buf;
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        msg.buf:= GetMem(msg.len);
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        Move(tmp^, msg.buf^, msg.len);
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        FreeMem(tmp, msg.len)
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    end;
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    ipcRead:= msg;
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    msg.str[0]:= #0;
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    msg.buf:= nil;
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    SDL_CondSignal(cond);
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    SDL_UnlockMutex(mut)
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end;
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function ipcCheck(var msg: TIPCMessage; mut: PSDL_mutex): boolean;
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begin
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    SDL_LockMutex(mut);
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    ipcCheck:= (msg.str[0] > #0) or (msg.buf <> nil);
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    SDL_UnlockMutex(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, msgEngine, mutEngine, condEngine)
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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, msgFrontend, mutFrontend, condFrontend)
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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, msgFrontend, mutFrontend, condFrontend)
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end;
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function ipcReadFromEngine: TIPCMessage;
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begin
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    ipcReadFromEngine:= ipcRead(msgFrontend, mutFrontend, condFrontend)
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end;
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function ipcReadFromFrontend: shortstring;
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begin
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    ipcReadFromFrontend:= ipcRead(msgEngine, mutEngine, condEngine).str
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end;
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function ipcCheckFromEngine: boolean;
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begin
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    ipcCheckFromEngine:= ipcCheck(msgFrontend, mutFrontend)
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end;
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function ipcCheckFromFrontend: boolean;
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begin
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    ipcCheckFromFrontend:= ipcCheck(msgEngine, mutEngine)
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end;
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function  listener(p: pointer): Longint; cdecl; export;
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var msg: TIPCMessage;
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begin
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    listener:= 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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            callbackFunction(callbackPointer, @msg.str[1], byte(msg.str[0]))
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        else
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        begin
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            callbackFunction(callbackPointer, 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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    callbackPointer:= p;
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    callbackFunction:= f;
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    callbackListenerThread:= SDL_CreateThread(@listener{$IFDEF SDL2}, 'ipcListener'{$ENDIF}, nil);
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end;
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procedure initIPC;
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begin
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    msgFrontend.str:= '';
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    msgFrontend.buf:= nil;
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    msgEngine.str:= '';
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    msgEngine.buf:= nil;
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    callbackPointer:= nil;
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    callbackListenerThread:= nil;
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    mutFrontend:= SDL_CreateMutex;
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    mutEngine:= SDL_CreateMutex;
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    condFrontend:= SDL_CreateCond;
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    condEngine:= SDL_CreateCond;
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end;
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procedure freeIPC;
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begin
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    SDL_KillThread(callbackListenerThread);
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    SDL_DestroyMutex(mutFrontend);
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    SDL_DestroyMutex(mutEngine);
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    SDL_DestroyCond(condFrontend);
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    SDL_DestroyCond(condEngine);
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end;
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end.