mirror of
https://github.com/zephyrproject-rtos/zephyr
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c3a2bbba16
nano_cpu_idle/nano_cpu_atomic_idle were not ported to the unified kernel, and only the old APIs were available. There was no real impact since, in the unified kernel, only the idle thread should really be doing power management. However, with a single-threaded kernel, these functions can be useful again. The kernel internals now make use of these APIs instead of the legacy ones. Change-Id: Ie8a6396ba378d3ddda27b8dd32fa4711bf53eb36 Signed-off-by: Benjamin Walsh <benjamin.walsh@windriver.com> |
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Title: Dining Philosophers
Description:
An implementation of a solution to the Dining Philosophers problem
(a classic multi-thread synchronization problem). This particular
implementation demonstrates the usage of microkernel task groups,
Mutex APIs and timer drivers from multiple (6) tasks.
The philosopher always tries to get the lowest fork first (f1 then f2).
When done, he will give back the forks in the reverse order (f2 then f1).
If he gets two forks, he is EATING. Otherwise, he is THINKING.
Each philosopher will randomly alternate between the EATING and THINKING
states.
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Building and Running Project:
This microkernel project outputs to the console. It can be built and executed
on QEMU as follows:
make qemu
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Troubleshooting:
Problems caused by out-dated project information can be addressed by
issuing one of the following commands then rebuilding the project:
make clean # discard results of previous builds
# but keep existing configuration info
or
make pristine # discard results of previous builds
# and restore pre-defined configuration info
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Sample Output:
Philosopher 0 EATING
Philosopher 1 THINKING
Philosopher 2 THINKING
Philosopher 3 EATING
Philosopher 4 THINKING
Philosopher 5 THINKING
Demo Description
----------------
An implementation of a solution to the Dining Philosophers problem
(a classic multi-thread synchronization problem). This particular
implementation demonstrates the usage of multiple (6) tasks
of differing priorities and the nanokernel semaphores and timers.