* [ECOS] Thread-specific data
@ 1999-06-18 11:57 Jamie Guinan
1999-06-21 2:33 ` Jonathan Larmour
0 siblings, 1 reply; 2+ messages in thread
From: Jamie Guinan @ 1999-06-18 11:57 UTC (permalink / raw)
To: ecos-discuss
Hello,
I have a question about thread-specific data in eCos.
I have a library in which I would like to associate
an integer value with the calling thread.
Can the value returned by cyg_thread_new_data_index()
be shared by all threads that want to index thread-specific
data based on a specific key?
In other words, is it true that the cyg_ucount32 returned
by cyg_thread_new_data_index() is _not_ a per-thread datum
itself? I would hope not, but I just wanted to clarify the
issue.
Thanks,
-Jamie
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ECOS] Thread-specific data
1999-06-18 11:57 [ECOS] Thread-specific data Jamie Guinan
@ 1999-06-21 2:33 ` Jonathan Larmour
0 siblings, 0 replies; 2+ messages in thread
From: Jonathan Larmour @ 1999-06-21 2:33 UTC (permalink / raw)
To: guinan; +Cc: ecos-discuss
In article < Pine.LNX.3.96.990618144410.26479B-100000@newt.home.net > you write:
>
>In other words, is it true that the cyg_ucount32 returned
>by cyg_thread_new_data_index() is _not_ a per-thread datum
>itself? I would hope not, but I just wanted to clarify the
>issue.
Yes, it (quite sensibly) is not a per-thread value itself :-).
The map of free thread data indexes can be found in the Cyg_Thread class
in kernel/v1_2_1/include/thread.hxx as:
// Map of free thread_data indexes. Each bit represents an index
// and is 1 if that index is free, and 0 if it is in use.
static cyg_ucount32 thread_data_map;
The "static" stops it from being thread-specific.
HTH,
Jifl
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