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authorEelco Dolstra <e.dolstra@tudelft.nl>2010-10-29T15·04+0000
committerEelco Dolstra <e.dolstra@tudelft.nl>2010-10-29T15·04+0000
commit4aced7f8d0d5d2c1057b0f46a70a37a577f81fa5 (patch)
tree1908294aa8f029be6bc4c0f227074391dbaeee9b /src/libmain
parent8dadcede65c75488da4cc5e5d8266c4b176cb7e5 (diff)
parent26def5392f6f6364aa0939a2d4fc7705e786d38d (diff)
* Merge the GC branch.
Diffstat (limited to 'src/libmain')
-rw-r--r--src/libmain/Makefile.am2
-rw-r--r--src/libmain/shared.cc32
2 files changed, 33 insertions, 1 deletions
diff --git a/src/libmain/Makefile.am b/src/libmain/Makefile.am
index a9ee6604255e..1a2146e0448f 100644
--- a/src/libmain/Makefile.am
+++ b/src/libmain/Makefile.am
@@ -2,7 +2,7 @@ pkglib_LTLIBRARIES = libmain.la
 
 libmain_la_SOURCES = shared.cc
 
-libmain_la_LIBADD = ../libstore/libstore.la
+libmain_la_LIBADD = ../libstore/libstore.la @boehmgc_lib@
 
 pkginclude_HEADERS = shared.hh
 
diff --git a/src/libmain/shared.cc b/src/libmain/shared.cc
index eddc4e64b3d7..29fc13e33627 100644
--- a/src/libmain/shared.cc
+++ b/src/libmain/shared.cc
@@ -13,6 +13,10 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#if HAVE_BOEHMGC
+#include <gc/gc.h>
+#endif
+
 
 namespace nix {
 
@@ -314,6 +318,14 @@ static void setuidInit()
 }
 
 
+/* Called when the Boehm GC runs out of memory. */
+static void * oomHandler(size_t requested)
+{
+    /* Convert this to a proper C++ exception. */
+    throw std::bad_alloc();
+}
+
+
 }
 
 
@@ -335,6 +347,26 @@ int main(int argc, char * * argv)
 
     std::ios::sync_with_stdio(false);
 
+#if HAVE_BOEHMGC
+    /* Initialise the Boehm garbage collector.  This isn't necessary
+       on most platforms, but for portability we do it anyway. */
+    GC_INIT();
+
+    GC_oom_fn = oomHandler;
+
+    /* Set the initial heap size to something fairly big (384 MiB) so
+       that in most cases we don't need to garbage collect at all.
+       (Collection has a fairly significant overhead, some.)  The heap
+       size can be overriden through libgc's GC_INITIAL_HEAP_SIZE
+       environment variable.  We should probably also provide a
+       nix.conf setting for this.  Note that GC_expand_hp() causes a
+       lot of virtual, but not physical (resident) memory to be
+       allocated.  This might be a problem on systems that don't
+       overcommit. */
+    if (!getenv("GC_INITIAL_HEAP_SIZE"))
+        GC_expand_hp(384 * 1024 * 1024);
+#endif
+
     try {
         try {
             initAndRun(argc, argv);