Disabling the caches don't fixe the problem, I was wrong.
Maybe I'm initializing wrongly the RTEMS objects.
In the Init task I create the binary semaphore:
rtems_semaphore_create(a3_sem_name, 1, RTEMS_BINARY_SEMAPHORE |
RTEMS_FIFO | RTEMS_LOCAL, 0, &a3_sem_id);
Then I create 2 tasks with different priority:
rtems_task_create(
t_matmul_name, 1, RTEMS_MINIMUM_STACK_SIZE * 2, RTEMS_PREEMPT,
RTEMS_LOCAL, &t_matmul_id
);
rtems_task_create(
t_inout_name, 2, RTEMS_MINIMUM_STACK_SIZE * 2, RTEMS_PREEMPT,
RTEMS_LOCAL, &t_inout_id
);
The tasks must be synchronized through the semaphore, but they are not.
The semaphore is acquired by both tasks consecutively before it has been
released.
I suppose that it is due to an error in my BSP implementation, but I
don't know how to test it.
Thanks.
El 2018-11-28 11:18, Arturo Perez Garcia escribió:
RTEMS is running in the R5 processors in lockstep mode, hence it is
not an SMP configuration.
Thanks.
El 2018-11-27 14:45, Sebastian Huber escribió:
On 27/11/2018 13:23, Arturo Perez Garcia wrote:
Hi, I have been facing thread synchronization problems.
I was trying to synchronize two threads using a binary semaphore to
protect critical parts of the code. Today I realized that the
semaphore was been acquired sequentially by both threads before It
was released by any of them. This behavior has been fixed when I have
disabled the cache memories, either the data cache or instruction
cache. Could you give me some hint about this??
I'm using our own BSP for the zcu102, which was generated by
modifying the xilinx-zynq bsp for the RTEMS release 4.11.3. This
behavior can be related to a wrong implementation of the BSP??
Please run the smplock01 and smpatomic01 on your board. I guess the
cache snooping is not enabled.
SMP is experimental in RTEMS 4.11. I would use the RTEMS master.
--
Arturo Perez Garcia - arturo.pe...@upm.es
Researcher
Center of Industrial Electronics
Universidad Politecnica de Madrid
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