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Some devices within Ghostscript (currently the x11 devices,
uniprint and opvp/oprp) use non const static variables, so cannot
be run in multiple instances at a time.
We now maintain a core "count" of how many non-threadsafe devices are
being used at any time. This value can be atomically adjusted by calls
to gs_lib_ctx_nts_adjust.
Non threadsafe devices now call gx_init_non_threadsafe_device either
as or as part of their initialise_device proc. This function attempts
to increment the non-threadsafe count and fails to init if there is
already a non-threadsafe device running.
On success, the device finalize method is modified so that it will
decrement the count at the end.
The known non-threadsafe devices are updated to call this.
In order to have somewhere safe to store this count, we introduce
a gs_globals structure, shared between instances. Setting this up
without race conditions requires some new gp_ functions that can
make use of platform specific threading primitives. We have these
implemented for both windows and pthread based platforms. On other
platforms, we drop back to the old unsafe mechanism for counting
instances.
While we do this work, we take the opportunity to push the
gs_memory_t pointer used for non-threadsafe debug printing into thread
local storage.
This enables us to remove the remaining GS_THREADSAFE guarded
compilation from the source code. What is left is broadly down to
allowing debugging collection for statistics, and these are now
controlled by specific COLLECT_STATS_XXX defines. It is assumed
that anyone wanting to collect such stats is smart enough to not
try to do so while using Ghostscript in a multi-instance environment.
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The device initialize function currently performs 2 jobs. Firstly,
it fills out the device_procs. Secondly, it performs any minimal
initialization required by the device (typically none).
At various points in the code we want to be able to copy procs
from one 'prototype' device to another, so we call initialize
for that. This populates the device procs, but does other work
that typically requires a 'derived device' structure rather
than a vanilla gx_device to work in.
Accordingly, we split the job into two; initialize_device_procs
(the first part) and initialize_device (the second part). The
initialize_device_procs function will set up the initialize_device
function pointer along with the rest if required.
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This is slightly more involved than the other devices, as
internally some memory devices rely on being able to get
the prototype for other ones, and to reference their
functions.
Accordingly, we change to a much more restricted list of
procs (just for the ones that actually differ between
memory devices) and have an internal mechanism for getting those.
attempt to simplify init of memory devices.
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Also update copyright dates.
Remove gs_cmdl.ps as we no longer use it, and remove its entry from
psfiles.htm.
Remove xfonts.htm as this feature (xfont support) is long, long gone.
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Most of the ARCH_* macros had lower case equivalents for "backwards
compatibility" - it's been long enough.....
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Squashed into one commit (see branch for details of the evolution of the
branch).
This brings gpcl6 and gxps into the Ghostscript build system, and a shared
set of graphics library object files for all the interpreters.
Also, brings the same configuration options to the pcl and xps products as we
have for Ghostscript.
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