[haiku-bugs] Re: [Haiku] #8233: Patch for pthread_attr_getguardsize
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Thu, 05 Apr 2012 10:25:10 -0000
#8233: Patch for pthread_attr_getguardsize
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Reporter: unitedroad | Owner: bonefish
Type: | Status: assigned
enhancement | Milestone: R1
Priority: normal | Version: R1/Development
Component: | Keywords: pthread, pthread_attr_getguardsize
System/POSIX | Blocking:
Resolution: | Platform: All
Blocked By: |
Has a Patch: 1 |
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Comment (by bonefish):
Replying to [comment:11 hamish]:
> Also it seems I overlooked line 820 in vm.cpp: http://cgit.haiku-
os.org/haiku/tree/src/system/kernel/vm/vm.cpp#n820. The stack guard page
logic there is not actually used because the stack is mapped
`REGION_NO_PRIVATE_MAP`, but for the sake of consistency should the
private cache be created with the same guard size as the underlying cache?
Yes it should. And `REGION_PRIVATE_MAP` is actually used also for stacks
when they are CoW'ed -- otherwise after `fork()`ing one could write in the
guard range. A new `VMCache` method will be needed to get the guard size.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8233#comment:12>
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