multithreading - Detect the bounds of the stack of the current thread -

-

I am writing a semi-precise garbage collector, and I wonder if any of the borders to find out correctly Method is the system-assigned stack for a given thread.

I need this so that I can scan the stack for the root (sign), and my current view is to save the stack pointer when a new thread is entered and

( I know that this approach is not ideal in the long run, because it becomes unnecessary, because it is locked for each thread when starting garbage collection using the main lock. ) But I would like to have a more "safe" way of detecting the boundaries, because this root is quite easy to 'escape' - this mechanism (thread based on implementation - managed pthreads It is easy to do, but this is not the case with OpenMP or Grand Central Dispatch).

If this was a portable way to do this, but I do not expect this to be the case. I am currently working on Mac OS X 10.6, but the answer to any platform is welcome.

You use the VM system to protect the end of the stack, and expand on the VM writing network . Then you know the boundary of the stack inside a stack page.

But I am not sure that for the current roads, I have an objection to inspecting the present value of SP, * If you have a "big stack" concept * Small and small threads are adopted by the parallel community.

For a discussion about a world model, look for where you have "big pile" then you can not create a GC which only scans the "stack" because it is a heap allocated on demand ( E.g., Function entry). Now you need to scan all the stack segments that can be live.


Comments

Post a Comment

Popular posts from this blog

oracle - The fastest way to check if some records in a database table? -

-
I have a big table to work with. I have to see that there are some records whose parent_id is equal to my passing value. Currently I do this by implementing "my_table using select count (*) where parent_id =: id"; If the result> 0, it means that they exist. Because this is a very large table, and I do not care what the actual number of records present, I just want to know if it exists, so I think count (*) Bit is disabled. How do I apply this requirement most quickly? I'm using Oracle 10. # Tips for Hibernation & amp; Tricks It suggests writing in such a way: Integer number = (integer) session .createQuery ("Select Count (*) to ...."). UniqueResult (); I do not know what is the magic of the unique rule? Why does it fast? To compare, select "1 from mytable where parent_id = passId and rowrum", which is more efficient? If you are not interested in the number of records, then there is an EXISTS query one: Select 'y'
Read more

php - multilevel menu with multilevel array -

-
Just ask someone to solve this problem? I want to create a multilevel menu I can not find the right solution generated with multilevel array, it always gets an array_push error My study came from the original idea But still my Can not match the need. This is my MySQL [code] ----- --------------------- --------------- | ID | PARENT_ID | Name | Link | Seq | 1 | 0 | Dashboad | Dashboard / | 1 | 2 | 0 | Menu 1 | Menu 1 / | 2 | 3 | 0 | Menu 2 | Menu 2 / | 3 | 4 | 0 | Menu 3 | Menu 3 / | 4 | 5 | 2 | Joint Add / | 1 | 6 | 3 | Joint Add / | 1 | 7 | 2 | Edit | Edit / | 2 | 8 | 4 | Joint Add / | 1 ------------------------------------------ [/ Code] I want to do something like this in my array array ('dashboard' = & gt; array ('id' = & gt; '' 'Dame' = & gt; 'Dashboard', 'Title' = & gt; 'Dashboard', 'MatchMin' = & gt; Base_URL (). 'Dashboard /', 'Active' => = & Gt; NULL), &
Read more

jQuery UI: Datepicker month format -

-
I am trying to change the format of the month that shows in the popup (not in the date that the picker actually I do not have any choice anywhere to do this, do I like to use a sub-string () or something else? What I normally display is Trying to change: Class = "ui-datepicker-title"> January & lt; / span & gt; ... & lt; / div & gt; Div>
Read more