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cc24766fa6
For example, instead of doing
#include "nix/store-config.hh"
#include "nix/derived-path.hh"
Now do
#include "nix/store/config.hh"
#include "nix/store/derived-path.hh"
This was originally planned in the issue, and also recent requested by
Eelco.
Most of the change is purely mechanical. There is just one small
additional issue. See how, in the example above, we took this
opportunity to also turn `<comp>-config.hh` into `<comp>/config.hh`.
Well, there was already a `nix/util/config.{cc,hh}`. Even though there
is not a public configuration header for libutil (which also would be
called `nix/util/config.{cc,hh}`) that's still confusing, To avoid any
such confusion, we renamed that to `nix/util/configuration.{cc,hh}`.
Finally, note that the libflake headers already did this, so we didn't
need to do anything to them. We wouldn't want to mistakenly get
`nix/flake/flake/flake.hh`!
Progress on #7876
119 lines
3.1 KiB
C++
119 lines
3.1 KiB
C++
#include "nix/util/error.hh"
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#include "nix/util/environment-variables.hh"
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#include "nix/expr/eval-settings.hh"
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#include "nix/util/config-global.hh"
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#include "nix/util/serialise.hh"
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#include "nix/expr/eval-gc.hh"
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#include "expr-config-private.hh"
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#if NIX_USE_BOEHMGC
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# include <pthread.h>
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# if __FreeBSD__
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# include <pthread_np.h>
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# endif
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# include <gc/gc.h>
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# include <gc/gc_cpp.h>
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# include <gc/gc_allocator.h>
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# include <boost/coroutine2/coroutine.hpp>
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# include <boost/coroutine2/protected_fixedsize_stack.hpp>
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# include <boost/context/stack_context.hpp>
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#endif
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namespace nix {
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#if NIX_USE_BOEHMGC
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/* Called when the Boehm GC runs out of memory. */
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static void * oomHandler(size_t requested)
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{
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/* Convert this to a proper C++ exception. */
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throw std::bad_alloc();
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}
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static inline void initGCReal()
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{
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/* Initialise the Boehm garbage collector. */
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/* Don't look for interior pointers. This reduces the odds of
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misdetection a bit. */
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GC_set_all_interior_pointers(0);
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/* We don't have any roots in data segments, so don't scan from
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there. */
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GC_set_no_dls(1);
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/* Enable perf measurements. This is just a setting; not much of a
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start of something. */
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GC_start_performance_measurement();
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GC_INIT();
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GC_set_oom_fn(oomHandler);
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/* Set the initial heap size to something fairly big (25% of
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physical RAM, up to a maximum of 384 MiB) so that in most cases
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we don't need to garbage collect at all. (Collection has a
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fairly significant overhead.) The heap size can be overridden
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through libgc's GC_INITIAL_HEAP_SIZE environment variable. We
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should probably also provide a nix.conf setting for this. Note
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that GC_expand_hp() causes a lot of virtual, but not physical
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(resident) memory to be allocated. This might be a problem on
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systems that don't overcommit. */
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if (!getEnv("GC_INITIAL_HEAP_SIZE")) {
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size_t size = 32 * 1024 * 1024;
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# if HAVE_SYSCONF && defined(_SC_PAGESIZE) && defined(_SC_PHYS_PAGES)
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size_t maxSize = 384 * 1024 * 1024;
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long pageSize = sysconf(_SC_PAGESIZE);
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long pages = sysconf(_SC_PHYS_PAGES);
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if (pageSize != -1)
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size = (pageSize * pages) / 4; // 25% of RAM
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if (size > maxSize)
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size = maxSize;
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# endif
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debug("setting initial heap size to %1% bytes", size);
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GC_expand_hp(size);
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}
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}
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static size_t gcCyclesAfterInit = 0;
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size_t getGCCycles()
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{
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assertGCInitialized();
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return static_cast<size_t>(GC_get_gc_no()) - gcCyclesAfterInit;
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}
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#endif
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static bool gcInitialised = false;
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void initGC()
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{
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if (gcInitialised)
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return;
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#if NIX_USE_BOEHMGC
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initGCReal();
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gcCyclesAfterInit = GC_get_gc_no();
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#endif
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// NIX_PATH must override the regular setting
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// See the comment in applyConfig
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if (auto nixPathEnv = getEnv("NIX_PATH")) {
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globalConfig.set("nix-path", concatStringsSep(" ", EvalSettings::parseNixPath(nixPathEnv.value())));
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}
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gcInitialised = true;
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}
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void assertGCInitialized()
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{
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assert(gcInitialised);
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}
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} // namespace nix
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