Add a closing comment to the endif with the configuration
information to which the endif belongs too.
To make the code more clearer if the configs need adaptions.
Signed-off-by: Simon Hein <Shein@baumer.com>
Move the syscall_handler.h header, used internally only to a dedicated
internal folder that should not be used outside of Zephyr.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
The signal_poll_event function was previously called without the poll
lock held. This created a race condition between a thread calling k_poll
to wait for an event and another thread signalling for this same event.
This resulted in the waiting thread to stay pending and the handle to it
getting removed from the notifyq, meaning it couldn't get woken up
again.
Signed-off-by: Ambroise Vincent <ambroise.vincent@arm.com>
The _EXPIRED macro is no longer necessary. It is a relic of an older
timeout processing algorithm from several years ago.
Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
This header does not expose any public APIs, so move it under
kernel/include and change files including it.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
k_poll does not currently allow polling on pipes. This adds support
for doing so on buffered pipes.
Signed-off-by: Jeremy Herbert <jeremy.006@gmail.com>
This adds the internal function z_work_submit_to_queue(), which
submits the work item to the queue but doesn't force the thread to yield,
compared to the public function k_work_submit_to_queue().
When called from poll.c in the context of k_work_poll events, it ensures
that the thread does not yield in the context of the spinlock of object
that became available.
Fixes#45267
Signed-off-by: Lucas Dietrich <ld.adecy@gmail.com>
In order to bring consistency in-tree, migrate all kernel code to the
new prefix <zephyr/...>. Note that the conversion has been scripted,
refer to zephyrproject-rtos#45388 for more details.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
Removing the 'U' to avoid the type of num_events changed.
And make sure it is meaningful Z_SYSCALL_VERIFY micro.
Fixed#40614
Signed-off-by: NingX Zhao <ningx.zhao@intel.com>
The final else {} in the if...else if is missing required
comment (non-empty, ';' is not sufficient). This adds a comment
to comply with CG 15.7.
Signed-off-by: Jennifer Williams <jennifer.m.williams@intel.com>
Add Poll API and Work Poll tracing, default hooks, and documentation.
Signed-off-by: Torbjörn Leksell <torbjorn.leksell@percepio.com>
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
register_events() and signal_poll_event() missing final
else statement in the if else if construct. This commit adds
else {} to comply with coding guideline 15.7.
Signed-off-by: Jennifer Williams <jennifer.m.williams@intel.com>
This commit adds the ability to use a message queue as a
k_poll object. It follows the same pattern as polling on
FIFOs.
This change has been proven in practice at Samsara.
Fixes: #26728
Signed-off-by: Nick Graves <nicholas.graves@samsara.com>
Tests of a value against zero should be made explicit, unless the
operand is effectively Boolean. This is based on MISRA rule 14.4.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Add a 'U' suffix to values when computing and comparing against
unsigned variables and other related fixes of the same MISRA rule (10.4)
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This symbol is reserved and usage of reserved symbols violates the
coding guidelines. (MISRA 21.2)
NAME
signal - ANSI C signal handling
SYNOPSIS
#include <signal.h>
sighandler_t signal(int signum, sighandler_t handler);
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
This symbol is reserved and usage of reserved symbols violates the
coding guidelines. (MISRA 21.2)
NAME
remove - remove a file or directory
SYNOPSIS
#include <stdio.h>
int remove(const char *pathname);
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
`z_is_t1_higher_prio_than_t2` was being called twice in both the
context-switch fastpath and in `z_priq_rb_lessthan`, just to
dealing with priority ties. In addition, the API was error-prone
(and too much in the fastpath to be able to assert its invarients)
- see also #32710 for a previous example of this API breaking
and returning a>b but also b>a.
Replacing this with a direct 3-way comparison `z_cmp_t1_prio_with_t2`
sidesteps most of these issues. There is still a concern that
`sgn(z_cmp_t1_prio_with_t2(a,b)) != -sgn(z_cmp_t1_prio_with_t2(b,a))`
but I don't see any way to alleviate this aside from adding an
assert to the fastpath.
Signed-off-by: James Harris <james.harris@intel.com>
The poll code uses a dummy wait queue so the threads have something to
block on, but the previous coherence pass (which rearranged things to
put the _poller data elsewhere) missed that this was on the stack,
which is not allowed. It actually has no use except as a list, so
make it a global static instead.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
register_event always returns 0, so the conditional will
always take the first branch and code in the else part
is never reached.
Fixes#31282
Signed-off-by: Ningx Zhao <ningx.zhao@intel.com>
This legacy struct still had a non-standard name. Clean it up to
conform to currrent naming guidelines.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Fix the issue where the kernel poll code would place the tracking
struct on the caller stack and share it with other threads, thus
creating a cache coherence issue on systems where KERNEL_COHERENCE is
enabled.
This works by eliminating the thread backpointer in struct _poller and
simply placing the (now just two-byte!) struct directly into the
thread struct.
Note that this doesn't attempt to fix the API paradigm that the
natural way to structure a call to k_poll() is to use an array of
k_poll_events on the CALLER's stack. So it's likely that most
"typical" k_poll code is still going to have problems with
KERNEL_COHERENCE. But at least now the kernel internals aren't
fundamentally broken.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The poll code was playing this weird trick where the thread pointer in
the "struct _poller" object for a triggered work item. It would not
be a thread to wake up, but instead a pointer to the (non-polling)
thread operated by the work queue being triggered. The code would
never touch this thread, just use it as a way to get a pointer to the
enclosing work queue struct.
Just store the work queue pointer in the first place. It's much
simpler, and makes future modifications to remove that thread pointer
possible.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The triggered work scheme uses a trick where it overloads the thread
pointer field of the struct poller (which normally stores the ID of
the thread that is blocked in k_poll()) to be able to find the work
queue to which it will submit.
Give it its own pointer field to break this false dependency.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Somewhat weirdly, k_poll() can do one of two things when the set of
events is signaled: it can wake up a sleeping thread, or it can submit
an unrelated work item to a work queue. The difference in behaviors
is currently captured by a callback, but as there are only two it's
cleaner to put this into a "mode" enumerant. That also shrinks the
size of the data such that the poller struct can be moved somewhere
other than the calling stack.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
The k_poll implementation places a struct _poller on the stack and
shares it with other threads, which is incompatible with the
KERNEL_COHERENCE model of cached stacks.
Make this a hard build failure instead of a kconfig dependency for
clarity. The failures if a user actually enables both are subtle and
difficult to debug.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Both operands of an operator in the arithmetic conversions
performed shall have the same essential type category.
Changes are related to converting the integer constants to the
unsigned integer constants
Signed-off-by: Aastha Grover <aastha.grover@intel.com>
Add a k_timeout_t type, and use it everywhere that kernel API
functions were accepting a millisecond timeout argument. Instead of
forcing milliseconds everywhere (which are often not integrally
representable as system ticks), do the conversion to ticks at the
point where the timeout is created. This avoids an extra unit
conversion in some application code, and allows us to express the
timeout in units other than milliseconds to achieve greater precision.
The existing K_MSEC() et. al. macros now return initializers for a
k_timeout_t.
The K_NO_WAIT and K_FOREVER constants have now become k_timeout_t
values, which means they cannot be operated on as integers.
Applications which have their own APIs that need to inspect these
vs. user-provided timeouts can now use a K_TIMEOUT_EQ() predicate to
test for equality.
Timer drivers, which receive an integer tick count in ther
z_clock_set_timeout() functions, now use the integer-valued
K_TICKS_FOREVER constant instead of K_FOREVER.
For the initial release, to preserve source compatibility, a
CONFIG_LEGACY_TIMEOUT_API kconfig is provided. When true, the
k_timeout_t will remain a compatible 32 bit value that will work with
any legacy Zephyr application.
Some subsystems present timeout (or timeout-like) values to their own
users as APIs that would re-use the kernel's own constants and
conventions. These will require some minor design work to adapt to
the new scheme (in most cases just using k_timeout_t directly in their
own API), and they have not been changed in this patch, instead
selecting CONFIG_LEGACY_TIMEOUT_API via kconfig. These subsystems
include: CAN Bus, the Microbit display driver, I2S, LoRa modem
drivers, the UART Async API, Video hardware drivers, the console
subsystem, and the network buffer abstraction.
k_sleep() now takes a k_timeout_t argument, with a k_msleep() variant
provided that works identically to the original API.
Most of the changes here are just type/configuration management and
documentation, but there are logic changes in mempool, where a loop
that used a timeout numerically has been reworked using a new
z_timeout_end_calc() predicate. Also in queue.c, a (when POLL was
enabled) a similar loop was needlessly used to try to retry the
k_poll() call after a spurious failure. But k_poll() does not fail
spuriously, so the loop was removed.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Allow caller to supply 0 events in which case the function just
does the sleep. This is useful so that the caller does not need
to create artificial events.
Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
Mark the old time conversion APIs deprecated, leave compatibility
macros in place, and replace all usage with the new API.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
Promote the private z_arch_* namespace, which specifies
the interface between the core kernel and the
architecture code, to a new top-level namespace named
arch_*.
This allows our documentation generation to create
online documentation for this set of interfaces,
and this set of interfaces is worth treating in a
more formal way anyway.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit adds new k_work_poll interface. It allows to
submit given work to a workqueue automatically when one of the
watched pollable objects changes its state.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
Signed-off-by: Peter A. Bigot <pab@pabigot.com>
This commit separates k_poll() infrastructure from k_poll() API
implementation, allowing other (future) API calls to use the same
framework.
Signed-off-by: Piotr Zięcik <piotr.ziecik@nordicsemi.no>
z_set_thread_return_value is part of the core kernel -> arch
interface and has been renamed to z_arch_thread_return_value_set.
z_set_thread_return_value_with_data renamed to
z_thread_return_value_set_with_data for consistency.
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This is part of the core kernel -> architecture interface
and is appropriately renamed z_arch_is_in_isr().
References from test cases changed to k_is_in_isr().
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
The semi-automated API changes weren't checkpatch aware. Fix up
whitespace warnings that snuck into the previous patches. Really this
should be squashed, but that's somewhat difficult given the structure
of the series.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
System call arguments, at the arch layer, are single words. So
passing wider values requires splitting them into two registers at
call time. This gets even more complicated for values (e.g
k_timeout_t) that may have different sizes depending on configuration.
This patch adds a feature to gen_syscalls.py to detect functions with
wide arguments and automatically generates code to split/unsplit them.
Unfortunately the current scheme of Z_SYSCALL_DECLARE_* macros won't
work with functions like this, because for N arguments (our current
maximum N is 10) there are 2^N possible configurations of argument
widths. So this generates the complete functions for each handler and
wrapper, effectively doing in python what was originally done in the
preprocessor.
Another complexity is that traditional the z_hdlr_*() function for a
system call has taken the raw list of word arguments, which does not
work when some of those arguments must be 64 bit types. So instead of
using a single Z_SYSCALL_HANDLER macro, this splits the job of
z_hdlr_*() into two steps: An automatically-generated unmarshalling
function, z_mrsh_*(), which then calls a user-supplied verification
function z_vrfy_*(). The verification function is typesafe, and is a
simple C function with exactly the same argument and return signature
as the syscall impl function. It is also not responsible for
validating the pointers to the extra parameter array or a wide return
value, that code gets automatically generated.
This commit includes new vrfy/msrh handling for all syscalls invoked
during CI runs. Future commits will port the less testable code.
Signed-off-by: Andy Ross <andrew.j.ross@intel.com>
move misc/util.h to sys/util.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move misc/slist.h to sys/slist.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
move misc/dlist.h to sys/dlist.h and
create a shim for backward-compatibility.
No functional changes to the headers.
A warning in the shim can be controlled with CONFIG_COMPAT_INCLUDES.
Related to #16539
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
