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Topic: MultiThreaded BB4W (Read 3478 times) |
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Re: MultiThreaded BB4W
« Reply #17 on: May 26th, 2010, 5:29pm » |
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I seem to have reached rather a dead-end with SPAWNLIB. It works (sort of) but there are two quite serious problems that I can find no way around:
1. Programs using it must be Run As Administrator on Vista and Windows 7. This is due to the way shared memory is handled on those systems, and I don't know of a workaround.
2. Large numbers of handles are leaked. This appears to be due to ShellExecute, which on its own seems to leak handles. I don't know how to prevent it.
So unless solutions to these problems are found, I will archive SPAWNLIB as an interesting, but failed, experiment.
Richard.
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Michael Hutton
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Re: MultiThreaded BB4W
« Reply #18 on: May 27th, 2010, 03:19am » |
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on May 26th, 2010, 5:29pm, Richard Russell wrote:| 1. Programs using it must be Run As Administrator on Vista and Windows 7. This is due to the way shared memory is handled on those systems, and I don't know of a workaround. |
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Would ShellExecuteEx using SEE_MASK_NOZONECHECKS be a solution? I haven't tested this but I hope this doesn't look at time zones instead, and I don't know how this effects Shared Memory created with the File Mapping functions.
Quote:2. Large numbers of handles are leaked. This appears to be due to ShellExecute, which on its own seems to leak handles. I don't know how to prevent it.
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Also wouldn't using ShellExecuteEx give a way to return the handle to the process invoked?
Quote:| So unless solutions to these problems are found, I will archive SPAWNLIB as an interesting, but failed, experiment. |
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I ask for my own enlightenment rather that assuming you hadn't thought of these...
Michael
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Re: MultiThreaded BB4W
« Reply #19 on: May 27th, 2010, 08:33am » |
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on May 27th, 2010, 03:19am, Michael Hutton wrote:| Would ShellExecuteEx using SEE_MASK_NOZONECHECKS be a solution? |
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What makes you think it might? The way Vista/7 handle shared memory isn't a function of how the process is launched (you can use the lower-level CreateProcess and the behaviour is the same).
Quote:| Also wouldn't using ShellExecuteEx give a way to return the handle to the process invoked? |
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As I said earlier in the thread, SPAWNLIB doesn't need to know the process handle. As you will appreciate, the process handle has nothing whatever to do with the handle leaks I mentioned; it is closed automatically when the process terminates.
Quote:| I ask for my own enlightenment rather that assuming you hadn't thought of these... |
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It's not so much that I hadn't thought of them, I don't see their relevance to the issues I mentioned (requiring to be Run As Administrator under Windows/7 and handle leaks from ShellExecute).
Richard.
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