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#1 |
68k
Join Date: Sep 2005
Location: Somewhere
Posts: 830
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Startup Code (from Icon ) - Forbid function
As I understand correctly Forbid function is used to off multitasking and I should use pair Forbid and Permit function. But I don't understand why in startup code from icon there is the Forbid call before back to OS. Mean
Code:
... jsr Forbid(A6) move.l WBenchMsg(PC),A1 ;WBenchMsg from GetMsg jsr ReplyMsg(A6) moveq #0,D0 rts "; we forbid so workbench can't UnLoadSeg() us before we are done" But what about Permit ? Is there any detailed information about icon startup ? |
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#2 |
Join Date: Jul 2008
Location: Sweden
Posts: 2,269
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Replying to the Workbench startup-message is how you tell Workbench that your program is about to end, but there's always the chance that a task-switch occurs between the call to ReplyMsg() and actually ending your program, so you need to disable multi-tasking to prevent this. It's not necessary to call Permit() again because this state is relative to each task, so multi-tasking will be correctly enabled again when your program ends.
The details are in the RKMs of course, and probably in the NKDs as well. |
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#3 |
68k
Join Date: Sep 2005
Location: Somewhere
Posts: 830
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Thanks a lot.
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