On Thu, 2005-09-29 at 20:47 +0800, Gary Li-126 wrote:
> Hi,
> I always get the error message:"Operation not permitted" When I use
> sem_init set pshared argument equal 1. Compiling as : "gcc -o sem_test
> sem_test.c -lc_r". My freebsd ver is release 5.4 p6.
>From sem_init(3):
A non-zero value for pshared specifies a
shared semaphore that can be used by multiple processes, which this
implementation is not capable of.
I suspect you're asking the impossible. You could try using a different
threading library, but libc_r won't work:
/usr/src/lib/libc_r/uthread/uthread_sem.c:
_sem_init(sem_t *sem, int pshared, unsigned int value)
{
[...]
if (pshared != 0) {
/*
* The user wants a semaphore that can be shared among
* processes, which this implementation can't do. Sounds like a
* permissions problem to me (yeah right).
*/
errno = EPERM;
retval = -1;
goto RETURN;
}
This return code is documenbted in the sem_init man page:
[EPERM] Unable to initialize a shared semaphore.
Gavin
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