Subj : Semaphore curiosity.
To   : comp.os.linux
From : RJGraham
Date : Thu Jul 15 2004 06:09 pm

Hello,

Below is 'ipcs' ouput from my linux box (RH9 2.4.x).

How can all the semaphores have the same key?
How can I delete them?

(running 'ipcrm -S 0' complains that the key is invalid).

I'm developing a C++ app and am having problems running out of 
semaphores (ie. semget() returns ENOSPC).

Thanks for your help.


------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     status 

0x00000000 229376     rgraham   777        393216     2          dest 


------ Semaphore Arrays --------
key        semid      owner      perms      nsems
0x00000000 141262848  rgraham   666        1
0x00000000 141393924  rgraham   666        1
0x00000000 141426693  rgraham   666        1
0x00000000 141459462  rgraham   666        1
0x00000000 141492231  rgraham   666        1
0x00000000 141525000  rgraham   666        1
0x00000000 141557769  rgraham   666        1
0x00000000 141590538  rgraham   666        1
0x00000000 141623307  rgraham   666        1
0x00000000 141656076  rgraham   666        1
0x00000000 141688845  rgraham   666        1
0x00000000 141721614  rgraham   666        1
0x00000000 141754383  rgraham   666        1
0x00000000 141787152  rgraham   666        1
0x00000000 141819921  rgraham   666        1
0x00000000 141852690  rgraham   666        1
0x00000000 141885459  rgraham   666        1
0x00000000 141918228  rgraham   666        1
0x00000000 141950997  rgraham   666        1
0x00000000 141983766  rgraham   666        1
0x00000000 142016535  rgraham   666        1
0x00000000 142049304  rgraham   666        1
0x00000000 142082073  rgraham   666        1
0x00000000 142114842  rgraham   666        1
0x00000000 142147611  rgraham   666        1
0x00000000 142180380  rgraham   666        1
0x00000000 142213149  rgraham   666        1
0x00000000 142245918  rgraham   666        1
0x00000000 142278687  rgraham   666        1
0x00000000 142311456  rgraham   666        1
0x00000000 142344225  rgraham   666        1
0x00000000 142376994  rgraham   666        1
0x00000000 142409763  rgraham   666        1
0x00000000 142442532  rgraham   666        1
0x00000000 142475301  rgraham   666        1
0x00000000 142508070  rgraham   666        1
0x00000000 142540839  rgraham   666        1
0x00000000 142573608  rgraham   666        1
0x00000000 142606377  rgraham   666        1
0x00000000 142639146  rgraham   666        1
0x00000000 142671915  rgraham   666        1
0x00000000 142704684  rgraham   666        1
0x00000000 142737453  rgraham   666        1
0x00000000 142770222  rgraham   666        1
0x00000000 142802991  rgraham   666        1
0x00000000 142835760  rgraham   666        1
0x00000000 142868529  rgraham   666        1
0x00000000 142901298  rgraham   666        1
0x00000000 142934067  rgraham   666        1
0x00000000 142966836  rgraham   666        1
0x00000000 142999605  rgraham   666        1
0x00000000 143032374  rgraham   666        1
0x00000000 143065143  rgraham   666        1
0x00000000 143097912  rgraham   666        1
0x00000000 143130681  rgraham   666        1
0x00000000 143163450  rgraham   666        1
0x00000000 143196219  rgraham   666        1
0x00000000 143228988  rgraham   666        1
0x00000000 143261757  rgraham   666        1
0x00000000 143294526  rgraham   666        1
0x00000000 143327295  rgraham   666        1
0x00000000 143360064  rgraham   666        1
0x00000000 143392833  rgraham   666        1
0x00000000 143425602  rgraham   666        1
0x00000000 143458371  rgraham   666        1
0x00000000 143491140  rgraham   666        1
0x00000000 143523909  rgraham   666        1
0x00000000 143556678  rgraham   666        1
0x00000000 143589447  rgraham   666        1
0x00000000 143622216  rgraham   666        1
0x00000000 143654985  rgraham   666        1
0x00000000 143687754  rgraham   666        1
0x00000000 143720523  rgraham   666        1
0x00000000 143753292  rgraham   666        1
0x00000000 143786061  rgraham   666        1
0x00000000 143818830  rgraham   666        1
0x00000000 143851599  rgraham   666        1
0x00000000 143884368  rgraham   666        1
0x00000000 143917137  rgraham   666        1
0x00000000 143949906  rgraham   666        1
0x00000000 143982675  rgraham   666        1
0x00000000 144015444  rgraham   666        1
0x00000000 144048213  rgraham   666        1
0x00000000 144080982  rgraham   666        1
0x00000000 144113751  rgraham   666        1
0x00000000 144146520  rgraham   666        1
0x00000000 144179289  rgraham   666        1
0x00000000 144212058  rgraham   666        1
0x00000000 144244827  rgraham   666        1
0x00000000 144277596  rgraham   666        1
0x00000000 144310365  rgraham   666        1
0x00000000 144343134  rgraham   666        1
0x00000000 144375903  rgraham   666        1
0x00000000 144408672  rgraham   666        1
0x00000000 144441441  rgraham   666        1
0x00000000 144474210  rgraham   666        1
0x00000000 144506979  rgraham   666        1
0x00000000 144539748  rgraham   666        1
0x00000000 144572517  rgraham   666        1
0x00000000 144605286  rgraham   666        1
0x00000000 144638055  rgraham   666        1
0x00000000 144670824  rgraham   666        1
0x00000000 144703593  rgraham   666        1
0x00000000 144736362  rgraham   666        1
0x00000000 144769131  rgraham   666        1
0x00000000 144801900  rgraham   666        1
0x00000000 144834669  rgraham   666        1
0x00000000 144867438  rgraham   666        1
0x00000000 144900207  rgraham   666        1
0x00000000 144932976  rgraham   666        1
0x00000000 144965745  rgraham   666        1
0x00000000 144998514  rgraham   666        1
0x00000000 145031283  rgraham   666        1
0x00000000 145064052  rgraham   666        1
0x00000000 145096821  rgraham   666        1
0x00000000 145129590  rgraham   666        1
0x00000000 145162359  rgraham   666        1
0x00000000 145195128  rgraham   666        1
0x00000000 145227897  rgraham   666        1
0x00000000 145260666  rgraham   666        1
0x00000000 145293435  rgraham   666        1
0x00000000 145326204  rgraham   666        1
0x00000000 145358973  rgraham   666        1
0x00000000 145391742  rgraham   666        1
0x00000000 145424511  rgraham   666        1

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages

.