I am trying to get multiple threads to lock specific regions of a file.
However, since each thread has the same PID, it appears that a lock by
one thread does not block another thread from the same process.
How does one maintain file locking between sibling threads?
- Matt
15  5243 
Matt Brandt wrote:
I am trying to get multiple threads to lock specific regions of a file.
However, since each thread has the same PID, it appears that a lock by
one thread does not block another thread from the same process.
How does one maintain file locking between sibling threads?
comp.programmin g.threads or an OS programming group would be a more
appropriate place to ask this. Neither C nor C++ have standard thread
or file locking support.
--
Ian Collins.
Hi,
Maybe use a piece of code in your program to keep track of which thread
locked which region. Protrecting that piece of code with a mutex. Most
system support mutexes ( for instance sunos, MS-Windows and I believe linux)
..
Regards, Ron AF Greve http://www.InformationSuperHighway.eu
"Ian Collins" <ia******@hotma il.comwrote in message
news:5l******** ****@mid.indivi dual.net...
Matt Brandt wrote:
>I am trying to get multiple threads to lock specific regions of a file.
However, since each thread has the same PID, it appears that a lock by
one thread does not block another thread from the same process.
How does one maintain file locking between sibling threads?
comp.programmin g.threads or an OS programming group would be a more
appropriate place to ask this. Neither C nor C++ have standard thread
or file locking support.
--
Ian Collins.
Matt Brandt wrote:
I am trying to get multiple threads to lock specific regions of a file.
However, since each thread has the same PID, it appears that a lock by
one thread does not block another thread from the same process.
How does one maintain file locking between sibling threads?
Both Standard C and C++ assume that there is nothing else running besides
your program, and both languages don't support threads. Therefore, there is
no concept of "file locking". To do what you want, you have to resort to
system-specific libraries.
Matt Brandt wrote:
>
I am trying to get multiple threads to lock specific regions of a
file. However, since each thread has the same PID, it appears that
a lock by one thread does not block another thread from the same
process.
How does one maintain file locking between sibling threads?
Both threads and C++ are off-topic here (on c.l.c). We never heard
of a PID either. F'ups set.
--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home .att.net>
--
Posted via a free Usenet account from http://www.teranews.com
On Sep 14, 9:38 pm, CBFalconer <cbfalco...@yah oo.comwrote:
Matt Brandt wrote:
I am trying to get multiple threads to lock specific regions of a
file. However, since each thread has the same PID, it appears that
a lock by one thread does not block another thread from the same
process.
How does one maintain file locking between sibling threads?
Both threads and C++ are off-topic here (on c.l.c). We never heard
of a PID either. F'ups set.
Is your advertisement off topic?
Ron AF Greve wrote:
Please stop top posting. Your reply wasn't even a follow up to mine.
--
Ian Collins.
OK, well which ones then?
On 15 Sep 2007 at 12:06, Rolf Magnus wrote:
Matt Brandt wrote:
>I am trying to get multiple threads to lock specific regions of a file.
However, since each thread has the same PID, it appears that a lock by
one thread does not block another thread from the same process.
How does one maintain file locking between sibling threads?
Both Standard C and C++ assume that there is nothing else running besides
your program, and both languages don't support threads. Therefore, there is
no concept of "file locking". To do what you want, you have to resort to
system-specific libraries.
In article <sl************ ********@nospam .invalid>,
Matt Brandt <ma***@mailinat or.comtop-posted
>On 15 Sep 2007 at 12:06, Rolf Magnus wrote:
>Matt Brandt wrote:
>>I am trying to get multiple threads to lock specific regions of a file.
>To do what you want, you have to resort to
system-specific libraries.
>OK, well which ones then?
Putting on my mind-reading hat....
....
...
...
...
Got it!
On your system, you need nerf_lock(), quizzle84(),
and (especially), StopTopPosting( )
--
"law -- it's a commodity"
-- Andrew Ryan (The Globe and Mail, 2005/11/26)
"Matt Brandt" <ma***@mailinat or.comwrote in message
news:sl******** ************@no spam.invalid...
OK, well which ones then?
Boost has a thread library. Qt has one as well. Hard to say without
knowing what you use. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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