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225 lines
6.5 KiB
225 lines
6.5 KiB
page ,132
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;-----------------------------Module-Header-----------------------------;
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; Module Name: TASKA.ASM - Some task functions
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;
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; Copyright (c) 1984-1991 Microsoft Corporation
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;
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;-----------------------------------------------------------------------;
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?PLM = 1
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?WIN = 0
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PMODE = 1
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.xlist
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include cmacros.inc
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include windows.inc
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include mmsystem.inc
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.list
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externFP Yield
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externFP GetCurrentTask
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externFP PostAppMessage
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externFP PostMessage
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externFP PeekMessage
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externFP GetMessage
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externFP DispatchMessage
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externFP TranslateMessage
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ifndef SEGNAME
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SEGNAME equ <_TEXT>
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endif
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;-----------------------------------------------------------------------;
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createSeg %SEGNAME, CodeSeg, word, public, CODE
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sBegin CodeSeg
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assumes cs,CodeSeg
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assumes ds,nothing
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assumes es,nothing
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;-----------------------------------------------------------------------;
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;
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; @doc DDK MMSYSTEM TASK
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;
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; @api void | mmTaskYield | This function causes the current task
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; to yield.
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;
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; @comm For predictable results and future compatibility, use this
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; function rather than <f Yield> or the undocumented Kernel yield
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; function to yield within a task created with <f mmTaskCreate>.
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;
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;-----------------------------------------------------------------------;
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cProc mmTaskYield, <FAR, PUBLIC, PASCAL>, <>
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LocalV msg, %(SIZE MSGSTRUCT)
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cBegin
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;
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; we need to call PeekMessage() so ScanSysQue gets called
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; and USER gets the mouse/keyboard input right
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;
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; PeekMessage() may not Yield if there is a message in the
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; Queue so we yield if it did not.
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;
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lea ax, msg
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cCall PeekMessage, <ss, ax, NULL, 0, 0, PM_NOREMOVE>
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or ax,ax
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jz mmTaskYieldExit
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cCall Yield ; PeekMessage() did not yield, so yield
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mmTaskYieldExit:
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cEnd
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;-----------------------------------------------------------------------;
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;
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; @doc DDK MMSYSTEM TASK
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;
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; @api HTASK | mmGetCurrentTask | This function returns the
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; handle of the currently executing task created with
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; <f mmTaskCreate>.
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;
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; @rdesc Returns a task handle. For predictable results and future
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; compatibility, use this function rather than <f GetCurrentTask>
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; to get the task handle of a task created with <f mmTaskCreate>.
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;
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; @xref mmTaskCreate
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;
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;-----------------------------------------------------------------------;
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cProc mmGetCurrentTask, <FAR, PUBLIC, PASCAL>, <>
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cBegin <nogen>
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jmp FAR PTR GetCurrentTask ; Jump directly to avoid returning to here
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cEnd <nogen>
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;-----------------------------------------------------------------------;
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;
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; @doc DDK MMSYSTEM TASK
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;
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; @api UINT | mmTaskBlock | This function blocks the current
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; task context if its event count is 0.
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;
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; @parm HTASK | hTask | Task handle of the current task. For predictable
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; results, get the task handle from <f mmGetCurrentTask>.
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;
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; @xref mmTaskSignal mmTaskCreate
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;
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; @comm WARNING : For predictable results, must only be called from a
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; task created with <f mmTaskCreate>.
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;
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;-----------------------------------------------------------------------;
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cProc mmTaskBlock, <FAR, PUBLIC, PASCAL, NODATA>, <>
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ParmW hTask
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LocalV msg, %(SIZE MSGSTRUCT)
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cBegin
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mmTaskBlock_GetMessage:
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lea ax, msg
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cCall GetMessage, <ss, ax, NULL, 0, 0>; Retrieve any message for task
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cmp msg.msHWND, 0 ; Message sent to a window?
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je mmTaskBlock_CheckMessage ; If so, dispatch it
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lea ax, msg
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cCall TranslateMessage, <ss, ax> ; Probably a TaskMan message
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lea ax, msg
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cCall DispatchMessage, <ss, ax>
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jmp mmTaskBlock_GetMessage
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;
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; we got a message, wake up on any message >= WM_MM_RESERVED_FIRST
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;
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mmTaskBlock_CheckMessage:
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mov ax,msg.msMESSAGE
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cmp ax,WM_MM_RESERVED_FIRST
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jb mmTaskBlock_GetMessage
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cEnd
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sEnd
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;-----------------------------------------------------------------------;
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createSeg FIX, FixSeg, word, public, CODE
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sBegin FixSeg
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assumes cs,FixSeg
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assumes ds,nothing
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assumes es,nothing
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;-----------------------------------------------------------------------;
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;
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; @doc DDK MMSYSTEM TASK
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;
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; @api BOOL | mmTaskSignal | This function signals the specified
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; task, incrementing its event count and unblocking
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; it.
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;
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; @parm HTASK | hTask | Task handle. For predictable results, get the
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; task handle from <f mmGetCurrentTask>.
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;
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; @rdesc Returns TRUE if the signal was sent, else FALSE if the message
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; queue was full.
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;
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; @xref mmTaskBlock mmTaskCreate
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;
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; @comm Must be callable at interrupt time! WARNING : For
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; predictable results, must only be called from a task
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; created with <f mmTaskCreate>.
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;
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;-----------------------------------------------------------------------;
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cProc mmTaskSignal, <FAR, PUBLIC, PASCAL>, <>
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; ParmW hTask
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cBegin <nogen>
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pop bx ; Fetch the return address
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pop dx
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push WM_USER ; Message
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xor ax, ax
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push ax ; wParam
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push ax ; lParam
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push ax
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push dx ; Put return address back
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push bx
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jmp FAR PTR PostAppMessage ; Jump directly to avoid returning to here
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cEnd <nogen>
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;-----------------------------------------------------------------------;
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;
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; @doc DDK MCI
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; @api BOOL | mciDriverNotify | Used by a driver to send
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; a notification message
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;
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; @parm HWND | hwndCallback | The window to notify
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;
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; @parm UINT | wDeviceID | The device ID which triggered the callback
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;
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; @parm UINT | wStatus | The status of the callback. May be one of
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; MCI_NOTIFY_SUCCESSFUL or MCI_NOTIFY_SUPERSEDED or MCI_NOTIFY_ABORTED
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; or MCI_NOTIFY_FAILURE
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;
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; @rdesc Returns TRUE if notify was successfully sent, FALSE if the
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; application's message queue was full.
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;
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; @comm This function is callable at interrupt time.
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;
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;-----------------------------------------------------------------------;
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cProc mciDriverNotify, <FAR, PUBLIC, PASCAL>, <>
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; ParmW hwndCallback
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; ParmW wDeviceID
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; ParmW wStatus
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cBegin <nogen>
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pop bx ; Fetch the return address
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pop dx
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pop ax ; Fetch wStatus
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pop cx ; Fetch wDeviceID
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push MM_MCINOTIFY ; Message
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push ax ; wParam == wStatus
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push 0 ; HIWORD of lParam
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push cx ; LOWORD of lParam == wDeviceID
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push dx ; Put return address back
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push bx
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jmp FAR PTR PostMessage ; Jump directly to avoid returning to here
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cEnd <nogen>
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sEnd
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;-----------------------------------------------------------------------;
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END
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