SysV Shared Memory Problems
SysV Shared Memory Problems
- Subject: SysV Shared Memory Problems
- From: Alec Ellsworth <email@hidden>
- Date: Sat, 24 Apr 2004 23:05:18 -0500
Hi All,
I'm trying to port one of my apps from FreeBSD to OSX and am having a
problem during runtime. This app is a processor emulator for a
proprietary architecture and uses SysV shared memory for IPC. On
FreeBSD 4 and 5 (with SysV shared memory turned on) I don't have a
problem allocating large amounts of shared space, but under OSX I'm
getting a -1 returned if I try to allocate more than 1024 _bytes_!
Here's the code line that returns false:
id=shmget(key,kreq*1024, 0777 | IPC_CREAT);
Any time kreq>1, it fails. I've made sure I'm set up for larger
spaces via sysctl, but I must be missing something. My app only
allocates the block once and there is no other shm activity before this
point.
From sysctl -a:
kern.sysv.shmmax: 167772160
kern.sysv.shmmin: 1
kern.sysv.shmmni: 32
kern.sysv.shmseg: 8
kern.sysv.shmall: 65536
Thanks for any input. So far I absolutely love working in Xcode!
-Alec Ellsworth
Alec Ellsworth
Resilient Networks, LLC.
3701 W. Burnham Street
Suite A
Milwaukee, WI 53215
email@hidden
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