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Unusual semget() behaviour in FreeBSD

Hecate · 2003-10-27 20:37:57

I'm trying to use the semget() call in freebsd to create a semaphore but it keeps returning -1, with error number 28 (ENOSPC). This indicates the systems max. number of semaphores is being exceeded. Here's the offending code: I've tested this on linux (debian) with zero problems, is there some flaw in freebsds…

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27-10-2003 9:37pm

#1

Hecate

Registered Users Posts: 2,518 ✭✭✭

Join Date: February 1998

Posts: 2095

I'm trying to use the semget() call in freebsd to create a semaphore but it keeps returning -1, with error number 28 (ENOSPC). This indicates the systems max. number of semaphores is being exceeded.

Here's the offending code:

...snip snip...

static struct sembuf op_lock[2]={0, 0, 0, 0, 1, 0};

static struct sembuf op_unlock[1]={0, -1, IPC_NOWAIT};

#define IPCPERMS 0644
#define SEMID 888880

int semid = -1;

void lock_var(int count){

if (semid < 0) {

semid = semget(SEMID, 1, IPC_CREAT | IPCPERMS);
if (semid < 0) {
printf("\nError: %d Could not create semaphore\n", errno);
}
}

I've tested this on linux (debian) with zero problems, is there some flaw in freebsds implementation of semaphores?

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#2 28-10-2003 11:38pm
gerald

Closed Accounts Posts: 22 ✭

Join Date: December 2002

Posts: 16

- Check your kernel semaphores parameters.
samples in /usr/src/sys/i386/conf/LINT

- ipcs -a

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