Re: [Freeipmi-devel] Re: libfreipmi: Locking and Synchronization

[Anand Babu]

,----
| Well here's the culprit.  Automake is installing
| /var/lock/libfreeipmi/ipckey in a different directory than 
| everything else.
| 
| /bin/sh ./mkinstalldirs /var/lock/libfreeipmi
|  /usr/bin/install -c -m 644 ipckey /var/lock/libfreeipmi/ipckey
| /bin/sh ./mkinstalldirs /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi
|  /usr/bin/install -c -m 644 ChangeLog
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/ChangeLog
|  /usr/bin/install -c -m 644 INSTALL
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/INSTALL
|  /usr/bin/install -c -m 644 README
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/README
|  /usr/bin/install -c -m 644 AUTHORS
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/AUTHORS
|  /usr/bin/install -c -m 644 TODO
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/TODO
|  /usr/bin/install -c -m 644 BUGS
| /var/tmp/libfreeipmi-0.0.0/usr/share/doc/libfreeipmi/BUGS
`----
It was done on purpose. Because we allow multiple installations of
libfreeipmi and all of them should refer to a unique global shared
IPC_KEY file.

-ab


----- Original Message -----
From: Albert Chu <address@hidden>
Date: Wednesday, March 31, 2004 1:06 pm
Subject: [Freeipmi-devel] Re: libfreipmi: Locking and Synchronization

> address@hidden fish-0.0.0]$ /usr/sbin/fish
> ipmi-semaphores.c: 36: ipmi_mutex_init: errno (2): expression failed
> ipmi-kcs-interface.c: 64: ipmi_kcs_io_init: errno (2): expression 
> failedipmi_kcs_io_init: No such file or directory
> 
> Perhaps fish should create the lockfile for you if it doesn't exist?
> 
> Al
> 
> --
> Albert Chu
> address@hidden
> Lawrence Livermore National Laboratory
> 
> ----- Original Message -----
> From: Anand Babu <address@hidden>
> Date: Wednesday, March 31, 2004 9:14 am
> Subject: libfreipmi: Locking and Synchronization
> 
> > 
> > Implements mutex based on Sys V Semaphores.
> > 
> > IPMI_IPCKEY 
> > 
> >   PATH: "/var/lock/libfreeipmi/ipckey"
> >   Uses ftok () and PROJ_ID to generate KEYS.
> > 
> > 
> > IPCKEY APIs:
> > 
> >   IPMI_LAN_IPCKEY ()
> >   IPMI_KCS_IPCKEY ()
> >   IPMI_SMIC_IPCKEY ()
> >   IPMI_BT_IPCKEY ()
> >   Returns 'key'.
> > 
> > 
> > Initialization API:
> > 
> >   int ipmi_mutex_init (key_t key);
> >   Returns 'semid'.
> > 
> > 
> > Locking APIs:
> > 
> >   IPMI_MUTEX_LOCK(semid)
> >   IPMI_MUTEX_UNLOCK(semid)
> >   IPMI_MUTEX_DOWN (semid)
> >   IPMI_MUTEX_UP (semid)
> >   Returns 'void'
> > 
> >   IPMI_MUTEX_LOCK_INTERRUPTIBLE (semid)
> >   IPMI_MUTEX_LOCK_ASYNC (semid)
> >   IPMI_MUTEX_DOWN_INTERRUPTIBLE (semid)
> >   IPMI_MUTEX_DOWN_ASYNC (semid)
> >   Return '0' on success, otherwise it returns '-1' with errno
> >   indicating the error. Should restart when errno is 'EAGAIN'.
> > 
> > KCS Driver:
> > 
> >   int ipmi_kcs_get_mutex_semid (void);
> > 
> >   int ipmi_kcs_io_init (u_int16_t sms_io_base, unsigned long
> >                        sleep_usecs);
> >   Initialized locking internally.
> >                        
> >   int8_t ipmi_kcs_cmd (u_int16_t sms_io_base, u_int8_t lun, u_int8_t
> >                fn, fiid_obj_t obj_cmd_rq, fiid_template_t
> >                tmpl_cmd_rq, fiid_obj_t obj_cmd_rs, fiid_template_t
> >                tmpl_cmd_rs);
> >   Locking handled internally. Handles BMC transaction - write and
> >   read.
> > 
> >   int8_t ipmi_kcs_cmd_interruptible (u_int16_t sms_io_base, u_int8_t
> >             lun, u_int8_t fn, fiid_obj_t obj_cmd_rq, fiid_template_t
> >             tmpl_cmd_rq, fiid_obj_t obj_cmd_rs, fiid_template_t
> >             tmpl_cmd_rs);
> >   Interruptible Locking. Should retry when errno is EAGAIN.
> >    Handles BMC transaction - write and read.
> > 
> > 
> > Notes:
> >  * Unlocking on exit or crash is handled automatically.
> >  * You can use "ipcs" and "ipcrm" utilities to view and manipulate
> >    these mutexes. 
> >    
> > -- 
> > _.|_ 
> > (_||_)
> > Free as in Freedom <www.gnu.org>
> > 
> 
> 
> 
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> 



-- 
 _.|_ 
(_||_)
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