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Commit 9396317a authored by Gregory Nutt's avatar Gregory Nutt
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Update TODO list. Make sure that all Bitbucket issues are included in the TODO list.

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NuttX TODO List (Last updated June 14, 2017)
NuttX TODO List (Last updated June 17, 2017)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This file summarizes known NuttX bugs, limitations, inconsistencies with
......@@ -9,22 +9,22 @@ issues related to each board port.
nuttx/:
(11) Task/Scheduler (sched/)
(12) Task/Scheduler (sched/)
(1) SMP
(1) Memory Management (mm/)
(0) Power Management (drivers/pm)
(3) Signals (sched/signal, arch/)
(3) pthreads (sched/pthread)
(4) pthreads (sched/pthread)
(0) Message Queues (sched/mqueue)
(8) Kernel/Protected Build
(3) C++ Support
(6) Binary loaders (binfmt/)
(14) Network (net/, drivers/net)
(16) Network (net/, drivers/net)
(4) USB (drivers/usbdev, drivers/usbhost)
(0) Other drivers (drivers/)
(12) Libraries (libc/, libm/)
(13) Libraries (libc/, libm/)
(10) File system/Generic drivers (fs/, drivers/)
(9) Graphics Subsystem (graphics/)
(10) Graphics Subsystem (graphics/)
(3) Build system / Toolchains
(3) Linux/Cywgin simulation (arch/sim)
(4) ARM (arch/arm/)
......@@ -34,6 +34,7 @@ apps/ and other Add-Ons:
(2) Network Utilities (apps/netutils/)
(1) NuttShell (NSH) (apps/nshlib)
(1) System libraries apps/system (apps/system)
(1) Modbus (apps/modbus)
(1) Pascal add-on (pcode/)
(4) Other Applications & Tests (apps/examples/)
......@@ -234,32 +235,65 @@ o Task/Scheduler (sched/)
could be improved and made a little more efficient with this
change.
Title: INAPPROPRIATE USE OF sched_lock() BY pthreads
Description: In implementation of standard pthread functions, the non-
standard, NuttX function sched_lock() is used. This is very
strong sense it disables pre-emption for all threads in all
task groups. I believe it is only really necessary in most
cases to lock threads in the task group with a new non-
standard interface, say pthread_lock().
This is because the OS resources used by a thread such as
mutexes, condition variable, barriers, etc. are only
meaningful from within the task group. So, in order to
performance exclusive operations on these resources, it is
only necessary to block other threads executing within the
task group.
This is an easy change: pthread_lock() and pthread_unlock()
would simply operate on a semaphore retained in the task
group structure. I am, however, hesitant to make this change:
I the flat build model, there is nothing that prevents people
from accessing the inter-thread controls from threads in
differnt task groups. Making this change, while correct,
might introduce subtle bugs in code by people who are not
using NuttX correctly.
Status: Open
Priority: Low. This change would improve real-time performance of the
OS but is not otherwise required.
Task: IDLE THREAD TCB SETUP
Description: There are issues with setting IDLE thread stacks:
1. One problem is stack-related data in the IDLE threads TCB.
A solution might be to standardize the use of g_idle_topstack.
That you could add initialization like this in os_start:
@@ -344,6 +347,11 @@ void os_start(void)
g_idleargv[1] = NULL;
g_idletcb.argv = g_idleargv;
+ /* Set the IDLE task stack size */
+
+ g_idletcb.cmn.adj_stack_size = CONFIG_IDLETHREAD_STACKSIZE;
+ g_idletcb.cmn.stack_alloc_ptr = (void *)(g_idle_topstack - CONFIG_IDLETHREAD_STACKSIZE);
+
/* Then add the idle task's TCB to the head of the ready to run list */
dq_addfirst((FAR dq_entry_t *)&g_idletcb, (FAR dq_queue_t *)&g_readytorun);
The g_idle_topstack variable is available for almost all architectures:
$ find . -name *.h | xargs grep g_idle_top
./arm/src/common/up_internal.h:EXTERN const uint32_t g_idle_topstack;
./avr/src/avr/avr.h:extern uint16_t g_idle_topstack;
./avr/src/avr32/avr32.h:extern uint32_t g_idle_topstack;
./hc/src/common/up_internal.h:extern uint16_t g_idle_topstack;
./mips/src/common/up_internal.h:extern uint32_t g_idle_topstack;
./misoc/src/lm32/lm32.h:extern uint32_t g_idle_topstack;
./renesas/src/common/up_internal.h:extern uint32_t g_idle_topstack;
./renesas/src/m16c/chip.h:extern uint32_t g_idle_topstack; /* Start of the heap */
./risc-v/src/common/up_internal.h:EXTERN uint32_t g_idle_topstack;
./x86/src/common/up_internal.h:extern uint32_t g_idle_topstack;
That omits there architectures: sh1, sim, xtensa, z16, z80,
ez80, and z8. All would have to support this common
globlal variable.
Also, the stack itself may be 8-, 16-, or 32-bits wide,
depending upon the architecture.
2. Another problem is colorizing that stack to use with
stack usage monitoring logic. There is logic in some
start functions to do this in a function called go_os_start.
It is available in these architectures:
./arm/src/efm32/efm32_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/kinetis/kinetis_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/sam34/sam_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/samv7/sam_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/stm32/stm32_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/stm32f7/stm32_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/stm32l4/stm32l4_start.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/tms570/tms570_boot.c:static void go_os_start(void *pv, unsigned int nbytes)
./arm/src/xmc4/xmc4_start.c:static void go_os_start(void *pv, unsigned int nbytes)
But no others.
Status: Open
Priority: Low, only needed for more complete debug.
o SMP
^^^
......@@ -534,6 +568,33 @@ o pthreads (sched/pthreads)
Priority: Medium-low. Priority may be higher if system call overheade becomes
an issue.
Title: INAPPROPRIATE USE OF sched_lock() BY pthreads
Description: In implementation of standard pthread functions, the non-
standard, NuttX function sched_lock() is used. This is very
strong sense it disables pre-emption for all threads in all
task groups. I believe it is only really necessary in most
cases to lock threads in the task group with a new non-
standard interface, say pthread_lock().
This is because the OS resources used by a thread such as
mutexes, condition variable, barriers, etc. are only
meaningful from within the task group. So, in order to
performance exclusive operations on these resources, it is
only necessary to block other threads executing within the
task group.
This is an easy change: pthread_lock() and pthread_unlock()
would simply operate on a semaphore retained in the task
group structure. I am, however, hesitant to make this change:
I the flat build model, there is nothing that prevents people
from accessing the inter-thread controls from threads in
differnt task groups. Making this change, while correct,
might introduce subtle bugs in code by people who are not
using NuttX correctly.
Status: Open
Priority: Low. This change would improve real-time performance of the
OS but is not otherwise required.
o Message Queues (sched/mqueue)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
......@@ -1171,6 +1232,30 @@ o Network (net/, drivers/net)
deal with a list of devices. That would be a huge effect and
certainly doesn't dount as a "simple solution".
Title: ICMPv6 FOR 6loWPAN
Description: The current ICMPv6 and neighbor-related logic only works with
Ethernet MAC. For 6loWPAN, a new more conservative ICMPv6
definitions is provided by RFC 6775. This RFC needs to be
supported in order to support ping6 on a 6loWPAN network.
Status: Open
Priority: Low for now.
Title: ETHERNET LOCAL BROADCAST DOES NOT WORK
Description: In case of "local broadcast" the system still send ARP
request to the destination, but it shouldn't, it should
broadcast. For Example, the system has network with IP
10.0.0.88, netmask of 255.255.255.0, it should send
messages for 10.0.0.255 as broadcast, and not send ARP
for 10.0.0.255
For more easier networking, the next line should have give
me the broadcast address of the network, but it doesn't:
ioctl(_socket_fd, SIOCGIFBRDADDR, &bc_addr);
Status: Open
Priority: Medium
o USB (drivers/usbdev, drivers/usbhost)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
......@@ -1532,6 +1617,64 @@ o Libraries (libc/, libm/)
Status: Open
Priority: Low
Title: FORMATTING FIXED WIDTH INTEGERS
Description: Formats like this: lib_vsprintf(_, "%6.6u", 0) do not work.
There is no support for the precision/width option with
integer types. The format is simply is ignored and so can
even cause crashes.
For example:
int hello_main(int argc, char *argv[])
{
printf("Hello, World!!\n");
printf("%3.3u %3.3u %3.3u %3.3u %3.3u\n", 9, 99, 999, 9999, 99999);
return 0;
}
Generates this incorrect output:
NuttShell (NSH) NuttX-7.20
nsh> hello
Hello, World!!
9 99 999 9999 99999
nsh>
That output, of course, should have been:
9 99 999 999 999
The period and the precision value were being ignored (if
floating point was disabled). In that case, parsing of the
variable arguments could get out of sync. But a side
effect of the referenced change is that precision value is
now always parsed (but still incorrectly ignored for the
case of integer formats).
The fix would not be too difficult but would involve change
several functions. It would involve clipping the size of the
number string. For example:
/* Get the width of the output */
uwidth = getusize(FMT_CHAR, flags, n);
if (trunc > 0 && uwidth > trunc)
{
uwidth = trunc;
}
Then limiting the length of the output string to uwidth.
This would probably mean passing an additional parameter to
the many *toascii() functions like:
/* Output the number */
utoascii(obj, FMT_CHAR, flags, (unsigned int)n, uwidth);
Status: Open
Priority: Low
o File system / Generic drivers (fs/, drivers/)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
......@@ -1830,6 +1973,16 @@ o Graphics Subsystem (graphics/)
the single user mode, it will be yanked out from under your
feet in the not-so-distant future.
Title: WIDE-FOUNT SUPPORT
Description: Wide fonts are not currently supported by the NuttX graphics sub-
system. There is some discussion here:
https://groups.yahoo.com/neo/groups/nuttx/conversations/topics/3507
http://www.nuttx.org/doku.php?id=wiki:graphics:wide-fonts
Status: Open
Priority: Low for many, but I imagine higher in countries that use wide fonts
o Build system
^^^^^^^^^^^^
......@@ -1926,6 +2079,7 @@ o Build system
The .archive file would have to be removed on 'make clean' and would
also need to appear in .gitignore files.
o Other drivers (drivers/)
^^^^^^^^^^^^^^^^^^^^^^^^
......@@ -2151,6 +2305,30 @@ o System libraries apps/system (apps/system)
Priority: Low (unless you are using mixed C-buffered I/O with readline and
fgetc, for example).
o Modbus (apps/modbus)
^^^^^^^^^^^^^^^^^^^^
Title: MODBUS NOT USABLE WITH USB SERIAL
Description: Modbus can be used with USB serial, however, if the USB
serial connectiont is lost, Modbus will hang in an infinite
loop.
This is a problem in the handling of select() and read()
and could probabaly resolved by studying the Modbus error
handling.
A more USB-friendly solution would be to: (1) Re-connect and
(2) re-open the serial drviers. That is what is done is NSH.
When the serial USB device is removed, this terminates the
session and NSH will then try to re-open the USB device. See
the function nsh_waitusbready() in the file
apps/nshlib/nsh_usbconsole.c. When the USB serial is
reconnected the open() in the function will succeed and a new
session will be started.
Status: Open
Priority: Low. This is really an enhancement request: Modbus was never
designed to work with removable serial devices.
o Pascal Add-On (pcode/)
^^^^^^^^^^^^^^^^^^^^^^
......
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