Mutex

[Nicolas Dumeige]

Hi all,

How do you determine the resource on which a lock was set when you see a lot of mutex ?

Nicolas

[Nicolas Dumeige]

Gurus,

Does any one have an idea about mutex resource ?
Where could I get short but accurate presentation about mutex monitoring ?

Thanks for your time

Nicolas

[Jeff Schussele]

Hi,

Here's some man pages on mutex calls:

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B3921-90010/B3921-90010_top.html&con=/hpux/onlinedocs/B3921-90010/00/16/1688-con.html&toc=/hpux/onlinedocs/B3921-90010/00/16/1688-toc.html&searchterms=mutex&queryid=20040310-055850

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90695/B2355-90695_top.html&con=/hpux/onlinedocs/B2355-90695/00/00/82-con.html&toc=/hpux/onlinedocs/B2355-90695/00/00/82-toc.html&searchterms=mutex&queryid=20040310-055850

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90695/B2355-90695_top.html&con=/hpux/onlinedocs/B2355-90695/00/00/81-con.html&toc=/hpux/onlinedocs/B2355-90695/00/00/81-toc.html&searchterms=mutex&queryid=20040310-055850

http://www.docs.hp.com/cgi-bin/fsearch/framedisplay?top=/hpux/onlinedocs/B2355-90695/B2355-90695_top.html&con=/hpux/onlinedocs/B2355-90695/00/00/88-con.html&toc=/hpux/onlinedocs/B2355-90695/00/00/88-toc.html&searchterms=mutex&queryid=20040310-060129

HTH,
Jeff

[Robert-Jan Goossens]

Hi,

search the IT resource center forum for "mutex" there are lots of hits.

Regards,
Robert-Jan

[Nicolas Dumeige]

When tracing a process, I see mutex syscall among other coordination means (see trace below).
How to determine the resource shared by threads ?

/8: lwp_mutex_lock(0xF83ECD10) = 0
/7: lwp_cond_wait(0xF83ECD28, 0xF83ECD10, 0xF6F05D30) Err#62 ETIME
/5: lwp_sema_wait(0xF680FE60) = 0
/7: lwp_sema_post(0xF680FE60) = 0
/7: lwp_cond_signal(0xF680FF18) = 0
/5: lwp_mutex_lock(0xF83ECD10) = 0
/4: poll(0xF720AB20, 1, 10000) = 0
/4: getpid() = 19034 [15348]
/4: getpid() = 19034 [15348]
/4: getpid() = 19034 [15348]
/4: getpid() = 19034 [15348]
/4: getpid() = 19034 [15348]
/7: lwp_cond_wait(0xF83ECD28, 0xF83ECD10, 0xF6F05D30) Err#62 ETIME
/7: lwp_sema_post(0xF7007E60) = 0
/7: lwp_cond_signal(0xF7007F18) = 0
/8: lwp_sema_wait(0xF7007E60) = 0
/1: poll(0xFFBEE220, 1, 4000) = 0
/1: lseek(64, 16176, SEEK_SET) = 16176
/1: read(64, " I\0 W\0 R\0 N\0 E\0 T\0".., 8192) = 3434
/1: lseek(64, 2046, SEEK_SET) = 2046
/1: read(64, " I\0 W\0 R\0 N\0 E\0 T\0".., 8192) = 8192
/1: uname(0xFFBEDDE8) = 1
/1: getpid() = 19034 [15348]