There are number problems with the implementation of realtime signals in NuttX as discussed in Issue #8869. A first step to correcting any of these is to correct the definitions of SIGRTMIN, SIGRTMAX, and RTSIG_SIX.
SIGRTMIN is the first real-time signals. Real-time signal numbers must not overlap the standard signal numbers. Before this fix, it was set equal to the first standard signal. Real-time signals differ from standard signals in that (1) they have no default actions, and (2) real time signal actions are prioritized whereas standard signal actions are processed FIFO.
SIGRTMAX is the last real-time signal.
RTSIG_MAX must be set equal to maximum number of realtime signals reserved for application use
The change corrects the definitons but has not impact at all becasuse none of there definitions are currently used in the OS. But they will be when prioritized real time signal handling is implemented.
CONFIG_SERIAL_TERMIOS only decide whether to support c_cflag field since
many terminal application need the first three fields to work correctly.
For more information please reference:
https://www.mail-archive.com/dev@nuttx.apache.org/msg09321.html
before this change(olimexino-stm32:tiny):
text data bss dec hex filename
34884 328 1768 36980 9074 nuttx
after this change:
text data bss dec hex filename
35052 340 1768 37160 9128 nuttx
delta
text data bss dec hex filename
168 12 0 180 b4 nuttx
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
PWM drivers use channel numbers 0 and -1 to skip the channel and/or
all following channels. This situation is well established in the drivers
however it was not mentioned in pwm.h file. This commit adds a comment
mentioning it.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
PWM drivers usually supports dead time generators that automatically
insert output activation delay for complementary PWM outputs. This
is usefull for some control purposes as control of H bridge for example.
This commit adds an application to driver interface that can be used
to set up those delays (if supported by the selected architecture)
directly from the application. The set up remains the same as for duty
cycle value.
The whole addition is by default disabled. It can be enabled by config
option PWM_DEADTIME.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
Use lib_get_stream() to fetch stdin/stdout/stderr,
since is more easy to works with other language by function call
than export native C structure memory layout.
Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
* 32-bit time_t should be unsigned because otherwise it wraps too
soon. (in 2038)
* 64-bit time_t should be unsigned because it should be consistent
within NuttX.
* While signed time_t seems more popular among other OSes, the
consisitency within NuttX outweighs, IMO.
beacause _SCHED_GETTID is in nuttx/sched.h, when use dump_stack()
compile error log:
unqlite.c:51256: undefined reference to `_SCHED_GETTID'
Signed-off-by: wangbowen6 <wangbowen6@xiaomi.com>
Generic drivers shoud not use architecture related config options like
CONFIG_SAMV7_PWM. This commit adds PWM pin overwrite under generic
configuration option CONFIG_PWM_OVERWRITE.
Now the overwrite can be used on other architectures as well or can be
completely disabled for SAMv7.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
Do not allow a deferred cancellation if the group is exiting, it is too
dangerous to allow the threads to execute any user space code after the
exit has started.
If the cancelled thread is not inside a cancellation point, just kill it
immediately via asynchronous cancellation. This will create far less
problems than allowing it to continue running user code.
SOCK_CTRL is added to provide special control over network drivers
and daemons. Currently, SOCK_DGRAM and SOCK_STREAM perform this control,
but these use socket resources. In the case of usersocket in particular,
this is a waste of the device's limited socket resources.
The version information basically uses 20 characters for date and time,
which is small enough to specify an arbitrary version string. Therefore,
increase the buffer a little.
caculate blk address when mempool_multiple_free
have a bug. need a real blocksize to caulate the
memory address.
Signed-off-by: anjiahao <anjiahao@xiaomi.com>
Without this POSIX-compatible definition, support for nativesockets module in Nimlang is problematic.
.nimcache/(snip)@spure@snativesockets.nim.c: In function 'toInt__pureZnativesockets_69':
.nimcache/(snip): error: 'IPPROTO_ICMPV6' undeclared (first use in this function); did you mean 'IPPROTO_ICMP6'?
291 | result = IPPROTO_ICMPV6;
| ^~~~~~~~~~~~~~
| IPPROTO_ICMP6
Signed-off-by: Takeyoshi Kikuchi <kikuchi@centurysys.co.jp>
There is an issue where the wrong process exit code is given to the parent
when a process exits. This happens when the process has pthreads running
user code i.e. not within a cancel point / system call.
Why does this happen ?
When exit() is called, the following steps are done:
- group_kill_children(), which tells the children to die via pthread_cancel()
Then, one of two things can happen:
1. if the child is in a cancel point, it gets scheduled to allow it to leave
the cancel point and gets destroyed immediately
2. if the child is not in a cancel point, a "cancel pending" flag is set and
the child will die when the next cancel point is encountered
So what is the problem here?
The last thread alive dispatches SIGCHLD to the parent, which carries the
process's exit code. The group head has the only meaningful exit code and
this is what should be passed. However, in the second case, the group head
exits before the child, taking the process exit code to its grave. The child
that was alive will exit next and will pass its "status" to the parent process,
but this status is not the correct value to pass.
This commit fixes the issue by passing the group head's exit code ALWAYS to
the parent process.
D:\archer\code\nuttx\include\nuttx/net/netfilter/x_tables.h(71,7):
error C2229: type 'struct xt_standard_target' has an illegal zero-sized array
Compiler error C2229:
A member of a structure or bit field contains a zero-sized array that is not the last member.
Reference:
https://learn.microsoft.com/en-us/cpp/error-messages/compiler-errors-1/compiler-error-c2229?view=msvc-170
Signed-off-by: chao an <anchao@xiaomi.com>
SOCK_CTRL is added to provide special control over network drivers
and daemons. Currently, SOCK_DGRAM and SOCK_STREAM perform this control,
but these use socket resources. In the case of usersocket in particular,
this is a waste of the device's limited socket resources.
The function is not relevant any longer, remove it. Also remove
save_addrenv_t, the parameter taken by up_addrenv_restore.
Implement addrenv_select() / addrenv_restore() to handle the temporary
instantiation of address environments, e.g. when a process is being
created.
There is currently a big problem in the address environment handling which
is that the address environment is released too soon when the process is
exiting. The current MMU mappings will always be the exiting process's, which means
the system needs them AT LEAST until the next context switch happens. If
the next thread is a kernel thread, the address environment is needed for
longer.
Kernel threads "lend" the address environment of the previous user process.
This is beneficial in two ways:
- The kernel processes do not need an allocated address environment
- When a context switch happens from user -> kernel or kernel -> kernel,
the TLB does not need to be flushed. This must be done only when
changing to a different user address environment.
Another issue is when a new process is created; the address environment
of the new process must be temporarily instantiated by up_addrenv_select().
However, the system scheduler does not know that the process has a different
address environment to its own and when / if a context restore happens, the
wrong MMU page directory is restored and the process will either crash or
do something horribly wrong.
The following changes are needed to fix the issues:
- Add mm_curr which is the current address environment of the process
- Add a reference counter to safeguard the address environment
- Whenever an address environment is mapped to MMU, its reference counter
is incremented
- Whenever and address environment is unmapped from MMU, its reference
counter is decremented, and tested. If no more references -> drop the
address environment and release the memory as well
- To limit the context switch delay, the address environment is freed in
a separate low priority clean-up thread (LPWORK)
- When a process temporarily instantiates another process's address
environment, the scheduler will now know of this and will restore the
correct mappings to MMU
Why is this not causing more noticeable issues ? The problem only happens
under the aforementioned special conditions, and if a context switch or
IRQ occurs during this time.
Detach the address environment handling from the group structure to the
tcb. This is preparation to fix rare cases where the system (MMU) is left
without a valid page directory, e.g. when a process exits.
sim/rpserver
NuttShell (NSH) NuttX-12.0.0
server> cu
_assert: Current Version: NuttX server 12.0.0 3ead669e7a-dirty Feb 2 2023 23:53:48 sim
_assert: Assertion failed : at file: libs/libc/misc/lib_mutex.c:303 task: cu 0x5662fff4
Signed-off-by: chao an <anchao@xiaomi.com>
NuttX kernel should not use the syscall functions, especially after
enabling CONFIG_SCHED_INSTRUMENTATION_SYSCALL, all system functions
will be traced to backend, which will impact system performance.
Signed-off-by: chao an <anchao@xiaomi.com>
First configure nuttx to support ipv4 and ipv6 dual stack,
then start two simulators and run Iperf ipv4 udp speed test,
unaligned access exception to sockaddr_in occours.
The root cause is that struct sockaddr_storage isn't set to
the desired alignment.
Signed-off-by: luojun1 <luojun1@xiaomi.com>
Here is a case how to use arg:
If application need do the ADC conversion as the same frequency and phase
of PWM, he can pass a semaphore as arg and then PWM driver will post the
semaphore in he start point of every period.
Signed-off-by: zhangchengqi <zhangchengqi@xiaomi.com>
dbus/dbus/dbus-pollable-set-epoll.c:258:18: error: ‘EPOLLET’ undeclared
(first use in this function); did you mean ‘EPOLLERR’?
258 | event.events = EPOLLET;
| ^~~~~~~
| EPOLLERR
Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This is preparation for moving address environments out of the group
structure into the tcb.
Why move ? Because the group is destroyed very early in the exit phase,
but the MMU mappings are needed until the context switch to the next
process is complete. Otherwise the MMU will lose its mappings and the
system will crash.
continue the follow work:
commit 43e7b13697
Author: Xiang Xiao <xiaoxiang@xiaomi.com>
Date: Sun Jan 22 19:31:32 2023 +0800
assert: Log the assertion expression in case of fail
Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
