Hi all, I'm having trouble trying to share a semaphore that is created in user-space context with a rtdm-driver that runs in kernel-space. I was hoping you could explain me what I'm doing wrong.
I'm using a posix-skin based user-space Xenomai application that runs a loop which is triggered by a semaphore. This semaphore is posted by a pthread that runs at a specific frequency. However, I want to be able to synchronize this loop with an external hardware trigger that is read out by a rtdm-driver. To do so, I try to disable the semaphore-post in the user-mode pthread, and re-use the existing semaphore in kernel-mode (the rtdm-driver). Unfortunately, the rtdm-driver is not able to find the user-space created semaphore. I wrote a little test-program to explain the problem. If required, I will post the complete test-program, but for now I will show some code-snippets. In the user-space application a semphore is created using the sem_open sys-call: clockSem = sem_open(SEMNAME, O_CREAT, 0, 0); clockSem, which is a pointer to sem_t returns an address (!= SEM_FAILED). With an ioctl-call I try to open the same semaphore in kernel-mode: sem_p = sem_open(SEMNAME, 0); This fails. sem_p equals SEM_FAILED, and errno is set to 2 (ENOENT). I'm runing Linux 2.6.29.4 x86 32bit, Xenomai 2.4.8, ipipe 2.4-01 Thanks, Remco den Breeje _______________________________________________ Xenomai-core mailing list [email protected] https://mail.gna.org/listinfo/xenomai-core
