What is the overall locking mechanism? If program A is reading /some/file and program B does a rm on it, what happens? From observed behavior, I think the file doesn't go away until A is done with it. I'm told that:
Unix uses shared memory and mutex locks to ensure that files are locked between processes. How was that implemented on z/OS? ...and I'd like to understand it more. Anyone have any pointers? On Fri, Jul 2, 2010 at 8:19 AM, McKown, John <[email protected]>wrote: > > -----Original Message----- > > From: IBM Mainframe Discussion List > > [mailto:[email protected]] On Behalf Of Itschak Mugzach > > Sent: Friday, July 02, 2010 7:13 AM > > To: [email protected] > > Subject: Unix systems and Serialization mechanism > > > > I am looking for a product that will serialize access to file > > (like the > > Enqueue/Dequeue in GRS) in Unix systems. Does this animal exist? > > > > ITschak > > No. UNIX does not have that functionality. I've looked for it. The closest > is called an "advisory lock". This is the flock() function in UNIX. But all > programs which access the file must code the flock() themselves. > > http://linux.about.com/library/cmd/blcmdl2_flock.htm > > -- > John McKown > Systems Engineer IV > IT > > Administrative Services Group > > HealthMarkets(r) > > 9151 Boulevard 26 * N. Richland Hills * TX 76010 > (817) 255-3225 phone * (817)-961-6183 cell > [email protected] * www.HealthMarkets.com > > Confidentiality Notice: This e-mail message may contain confidential or > proprietary information. If you are not the intended recipient, please > contact the sender by reply e-mail and destroy all copies of the original > message. HealthMarkets(r) is the brand name for products underwritten and > issued by the insurance subsidiaries of HealthMarkets, Inc. -The Chesapeake > Life Insurance Company(r), Mid-West National Life Insurance Company of > TennesseeSM and The MEGA Life and Health Insurance Company.SM > > > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: GET IBM-MAIN INFO > Search the archives at http://bama.ua.edu/archives/ibm-main.html > -- zMan -- "I've got a mainframe and I'm not afraid to use it" ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
