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Garbled Console Output

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Lee Lup Yuen 2022-12-17 08:51:20 +08:00
parent 5333999996
commit 94b17f7a4f
1 changed files with 33 additions and 4 deletions
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@ -4716,13 +4716,13 @@ funlockfile: 0x40a5cc78, ret=0
funlockfile: 0x40a5cc78, ret=0
```
`nxrmutex_lock` calls [`nxsem_wait`](https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_wait.c#L42-L210), which calls [`up_switch_context`](https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_switchcontext.c#L41-L103)
[`nxrmutex_lock`](https://github.com/apache/nuttx/blob/master/include/nuttx/mutex.h#L335-L377) calls [`nxmutex_lock`](https://github.com/apache/nuttx/blob/master/include/nuttx/mutex.h#L135-L179), which calls [`nxsem_wait`](https://github.com/apache/nuttx/blob/master/sched/semaphore/sem_wait.c#L42-L210), which calls [`up_switch_context`](https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_switchcontext.c#L41-L103)
Is there an issue with [`up_switch_context`](https://github.com/apache/nuttx/blob/master/arch/arm64/src/common/arm64_switchcontext.c#L41-L103)?
_Maybe it's caused by Multiple CPU Cores calling the same code?_
Checking that CPU ID is 0...
Let's check that CPU ID is 0...
```
```c
#include "../arch/arm64/src/common/arm64_arch.h" ////
_info("%p, ret=%d, up_cpu_index=%d\n", stream, ret, MPIDR_TO_CORE(GET_MPIDR())); ////
// Shows: `flockfile: 0x40a5cc78, ret=0, up_cpu_index=0`
@ -4731,6 +4731,35 @@ _info("%p, ret=%d, mpidr_el1=%p\n", stream, ret, read_sysreg(mpidr_el1)); ////
// Shows `flockfile: 0x40a5cc78, ret=0, mpidr_el1=0x80000000`
```
Yep CPU ID is always 0.
Let's print the Thread ID and Mutex Count...
```text
void flockfile(FAR struct file_struct *stream)
{
nxrmutex_lock(&stream->fs_lock);
_info("%p, thread=%d, mutex.count=%d\n", stream, gettid(), stream->fs_lock.count); ////
}
void funlockfile(FAR struct file_struct *stream)
{
_info("%p, thread=%d, mutex.count=%d\n", stream, gettid(), stream->fs_lock.count); ////
nxrmutex_unlock(&stream->fs_lock);
}
```
Thread ID is always the same. Mutex Count goes from 1 to 3 and drops to 2...
```text
lib_cxx_initialize: _sinit: 0x400e9000 _einit: 0x400e9000
flockfile: 0x40a5cc78, thread=2, mutex.count=1
flockfile: 0x40a5cc78, thread=2, mutex.count=2
flockfile: 0x40a5cc78, thread=2, mutex.count=3
funlockfile: 0x40a5cc78, thread=2, mutex.count=3
funlockfile: 0x40a5cc78, thread=2, mutex.count=2
```
TODO
# Add Display Engine Driver to NuttX Kernel