With the sigrok session running in a worker thread, if sr_session_stop is called
from another thread, it shuts down the pollfds used by the hardware drivers,
without ensuring that the sigrok event loop is no longer using those pollfds.
On the demo driver, this involves shutting down the GIOChannels, causing a
segfault when the sigrok event loop tries to use them. This is evident when
using the Stop button in PulseView, while the session is running.
This isn't a problem with just the demo driver; any driver's resources may be
freed by sr_session_stop concurrently with the sigrok session running.
To solve this problem, we don't touch the session itself in sr_session_stop().
Instead, we mark it for decommissioning and return. The session polls this flag,
and shuts itself down when requested.
This fixes bug 4.
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This has been deprecated in favor of sr_session_stop() since a while.
None of the current frontends use sr_session_halt() anymore, neither
does libsigrok.
Check the relevant arguments for != NULL before calling the actual
driver-specific function, so that the driver can safely assume those
arguments are non-NULL. This removes the need to duplicate these
checks in every driver.
Some sources may not be necessarily associated with a device. The best example
is the anykey pollfd from sigrok-cli. sr_session_stop only removes sources
associated with hardware devices via dev_acquisition_stop. Sources such as
anykey are not removed, and thus session->num_sources will not get to 0. As a
result, we may get into situations where the event loop enters an infinite
state.
To prevent this, all we have to do is remove any active sources that are still
present after dev_acquisition_stop has been called for all devices.
This fixes bug 14.
This patch marks packet structures and their payloads as const.
This indicates to packet receivers that modifications to these are
not allowed. In general all pointers should be marked const unless
modification of the referenced data is explicitly allowed.
Turn TODOs which should be user-visible into @todo so that Doxygen
shows them in the function docs, and also on the special "Todo List" page.
Those TODOs that should not be in the Doxygen docs are moved out of the
/** */ comment blocks.
Also fix some comments/items, and remove some obsolete ones.
sr_session_halt() in its current state is kind of useless and even dangerous.
All it will do is mark the session as not running, but wont signal the devices
to stop to capture data. This is not so much of a problem with the blocking
sr_session_run(), but once there is support for asynchronous data acquisition by
attaching the session sources to the applications mainloop sr_session_halt()
basically becomes a no-op. sr_session_stop() already does what needs to be done,
marking the session as not running and signal the devices to stop acquisition,
so make sr_session_halt() an alias for sr_session_stop() and deprecate its
usage.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
By cleaning up the driver state all devices will become inaccessible, which
means that is neither possible to query any information from it (like sample
rate) and it is also not possible to restart data acquisition.
sr_session_save() tries to query the sample rate from the device, as a result
calling sr_session_save() after calling sr_session_stop() - which is for example
done by sigrok-cli - will cause a segfault. This patch resolves the issue.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
A device is opened when it is added to a session, in the same fashion it should
be closed again when it is removed from a session.
Also remove all still attached devices from a session when the session is
destroyed.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Commit 7149ad7c ("sr: session: Keep a global pollfd array") contained a small
copy paste error. This patch fixes it.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
The session and demo device code contain a hack to make the demo device work on
Windows. This was neccessary since polling on windows requires special handling
and we can not just pass in the raw fd to poll.
With the previous patches which added support for non-fd based event sources
this hack is no longer required. The patch moves the GIOChannels used by the
demo device to the demo device context and uses sr_session_source_add_channel
to register a source for the channels instead of using the raw pipe fds.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
A raw file descriptor to poll on is not always available, this patch adds
support for adding a source for a GIOChannel or GPollFD.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Currently we keep a file descriptor for each source and construct a pollfd array
from these during each loop iteration in sr_session_run(). This patch modifies
the code to keep a global pollfd array which is only modified when a source is
added or removed. On one hand this gets rid of the constant constructing and
subsequent freeing of the pollfd array in sr_session_run(), on the other hand it
will allow us to implement support for non-fd based pollfds.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Use realloc to resize the source array when adding or removing a source. This
makes the code a bit smaller. In the remove function we now check whether the fd
is valid before doing anything else and if it is not simply do nothing. If it is
valid use memove to move the elements following the source one element down in
the array. Only after that has been done the array is re-allocated.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
All frontends will have to include <libsigrok/libsigrok.h> from now on.
This header includes proto.h and version.h, both installed from the
distribution into $INCLUDE/libsigrok/ as well.
The only dynamically changed header is now version.h, which has both
libsigrok and libtool compile-time versions in it.
Uwe Hermann
Martin Ling
Alexandru Gagniuc
Bert Vermeulen
Joel Holdsworth
Lars-Peter Clausen