 26 Dec 2010, Konstantin Olchanski, Bug Report, race condition and deadlock between ODB lock and SYSMSG lock in cm_msg()
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>
> The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
>
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29 Dec 2010, Konstantin Olchanski, Bug Report, use of nested locks in MIDAS
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A "nested" or "recursive" lock is a special type of lock that permits a lock holder to lock the same resources again and again, without deadlocking on itself.
They are
very useful, but tricky to implement because most system lock primitives (SYSV semaphores, POSIX mutexes, etc) do not permit nested locks, so all the logic |
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29 Dec 2010, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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>
> The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
>
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 17 Jan 2011, Andreas Suter, Bug Report, Problems with midas history SVN 4936
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I have the following problems after updating to midas SVN 4936: the history
system (web-page via mhttpd) seems to stop working. I checked the history files
themself and they are indeed written, except that the events ID's are not the
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11 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> >
> > The only remaining problem when running my script is some kind of deadlock between the ODB and SYSMSG semaphores...
> >
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13 Feb 2011, Lee Pool, Bug Report, Problems with midas history SVN 4936
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> I have the following problems after updating to midas SVN 4936: the history
> system (web-page via mhttpd) seems to stop working. I checked the history files
> themself and they are indeed written, except that the events ID's are not the
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15 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> Solution shall follow quickly, I have been hunting this deadlock for the last couple of weeks...
Over the last couple of days I made a series of commits to odb.c and midas.c to implement a buffer-based cm_msg()
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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> I have the following problems after updating to midas SVN 4936: the history
> system (web-page via mhttpd) seems to stop working. I checked the history files
> themself and they are indeed written, except that the events ID's are not the
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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It looks like email notices did not go the first time. Please read my replies below. K.O.
> > I have the following problems after updating to midas SVN 4936: the history
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16 Feb 2011, Konstantin Olchanski, Bug Report, Problems with midas history SVN 4936
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>
> Do you mind giving little more detail? We might have the same issue, where we got
> complaints that midas history stops working after a certain time.
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16 Feb 2011, Konstantin Olchanski, Bug Report, fixed. odb corruption, odb race condition?
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> My torture test runs okey in my mac now, one remaining problem is spurious client removal caused
> by semaphore starvation...
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16 Feb 2011, Lee Pool, Bug Report, Problems with midas history SVN 4936
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> >
> > Do you mind giving little more detail? We might have the same issue, where we got
> > complaints that midas history stops working after a certain time.
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17 Feb 2011, Stefan Ritt, Bug Report, Problems with midas history SVN 4936
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> uhm, mine might be completely unrelated to this, but it just so happened that the rev.
> 4936 was one that was used in a recent experiment, in which there was complaints about
> the responsiveness of the history plots. The history plots would take up to 30 seconds
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05 Jul 2011, Konstantin Olchanski, Bug Report, MacOS network socket timeouts non-functional
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It turns out that because of differences between select() syscall implementation between UNIX (MacOS,
maybe BSD) and Linux, network socket timeouts do not work.
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12 Dec 2011, Michael Murray, Bug Report, bk_delete uses memcpy instead of memmove
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In midas.c, the bk_delete function removes a bank by decrementing the total
event size and then copying the remaining banks into the location of the first
using memcpy from string.h.
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16 Dec 2011, Konstantin Olchanski, Bug Report, bk_delete uses memcpy instead of memmove
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> In midas.c, the bk_delete function removes a bank by decrementing the total
> event size and then copying the remaining banks into the location of the first
> using memcpy from string.h.
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19 Dec 2011, Stefan Ritt, Bug Report, bk_delete uses memcpy instead of memmove
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> > In midas.c, the bk_delete function removes a bank by decrementing the total
> > event size and then copying the remaining banks into the location of the first
> > using memcpy from string.h.
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29 Feb 2012, Konstantin Olchanski, Bug Report, Problem with semaphores
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Hi there! In the T2K/ND280 experiment in Japan, we keep having problems with MIDAS locking (probably
of ODB). The symptoms are: some program reports a timeout waiting for the ODB lock, then all programs
eventually die with this same error. Complete system meltdown. This does not look like the deadlock
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01 Mar 2012, Stefan Ritt, Bug Report, Problem with semaphores
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> Anyhow, if anybody can suggest such an advanced locking library it would be great. Will save me the
> effort of writing one.
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18 Apr 2012, Exaos Lee, Bug Report, Build error with mlogger: invalid conversion from ‘void*’ to ‘gzFile’ 
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I tried to build MIDAS under ArchLinux, failed on errors as following:
[CODE]src/mlogger.cxx: In function ‘INT midas_flush_buffer(LOG_CHN*)’:
src/mlogger.cxx:1011:54: error: invalid conversion from ‘void*’ to ‘gzFile’ [-fpermissive]
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