Hi Manfred, (2012-08-04 02:39), Manfred Spraul wrote: > Hi Seiichi, > > On 08/03/2012 02:49 PM, Seiichi Ikarashi wrote: >> semop() with SEM_UNDO sem_flg can result in ENOMEM even after >> succeeding semget() with large nsems. > How large is nsems, what is the use case? > Which kind of operations are performed? > Only simple semop(,,1) calls?
A real case was as follows. semget(IPC_PRIVATE, 70000, IPC_CREAT | IPC_EXCL); sops[0].sem_num = 0; sops[0].sem_op = 1; sops[0].sem_flg = SEM_UNDO; semop(semid, sops, 1); > > <linux/sem.h> still documents ~8000 as the upper limit, I'm not sure if Ah, I did not know it. #define SEMMSL 250 /* <= 8 000 max num of semaphores per id */ Thanks, Seiichi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
