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Only try to acquire the GIL if the Python interpreter is actually
initialized, otherwise there'll be a segfault.
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With these additions, frontends can now call libsigrokdecode API
functions from different threads without running into threading issues.
The backend releases the GIL when it is performing tasks that might take
a while and it doesn't need to run Python/C API calls during that time.
This allows frontends to run multiple PD stacks (in multiple frontend
threads) "at the same time" in a time-sharing, "interlocked" manner.
Whenever one of the decoders is inside e.g. self.wait() it releases the
GIL and thus allows other decoders to do some work in the mean time.
The user-visible effect is that for use-cases such as running 3 different
decoder stacks at the same time for an acquisition, the user will not
have to wait for PD 1 to finish decoding, then wait for PD 2 to finish
decoding, and only *then* being able to see annotations from PD 3.
Instead, all three PDs will decode some chunks of data from time to
time, thus the user is able to inspect annotations from all 3 PDs while
the acquisition and decoding is still going on.
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Old versions triggered valgrind errors as the API method to remove an
entry modifies the list that was being iterated.
Signed-off-by: Karl Palsson <karlp@etactica.com>
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This simplifies cross-platform handling of the Python/decoder paths
and module installation/dist a bit and also fixes bug #804.
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This fixes bug #461.
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Don't mess with colon-separated search path strings -- instead,
simply prepend items to the sys.path list object. Also keep the
internal decoder path list in the same order as the items added
to sys.path.
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Since Autoconf places some important feature flags only into the
configuration header, it is necessary to include it globally to
guarantee a consistent build.
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Use g_malloc*() for small allocations and assume they always
succeed. Simplify error handling in a few places accordingly.
Document the rules in the README file.
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This prevents Python.h from being included into client code, where
it can mess things up by e.g. redefining _POSIX_C_SOURCE.
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The function srd_check_init() is only used in decoder.c.
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srd_decoder_load_all() was really only getting a list of decoders
from the default (installation) path, so could not find uninstalled
decoders, or those in a custom added search path.
This broke development of new PDs when using the SIGROKDECODE_DIR
environment variable, and broke many of the unit tests in the tests/
directory -- those actually tested against the already-installed
decoders, not the ones about to be installed.
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