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Allow users to force gmp to use libgc

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* doc/ref/guile-invoke.texi (Environment Variables): Document
GUILE_INSTALL_GMP_MEMORY_FUNCTIONS.
* libguile/numbers.c (scm_init_numbers): Use environment variable.
This commit is contained in:
Andy Wingo 2021-04-26 22:26:31 +02:00
parent 04e9245918
commit 534dd35a3c
2 changed files with 22 additions and 0 deletions
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13
doc/ref/guile-invoke.texi
View file

@ -424,6 +424,19 @@ Guile uses the environment variable @env{HOME}, the name of your home
directory, to locate various files, such as @file{.guile} or
@file{.guile_history}.
@item GUILE_INSTALL_GMP_MEMORY_FUNCTIONS
@vindex GUILE_INSTALL_GMP_MEMORY_FUNCTIONS
Guile uses the GNU multi-precision (GMP) library to implement its bigint
support. It can use an included minimal version of GMP, or the system
version, which may be more optimal. If Guile is the sole user of GMP in
the process, Guile can tell GMP to allocate its digits using
garbage-collected memory. This can be significantly faster. However
this approach is unsafe if there are other libraries loaded that use
libgmp, such as the GnuTLS library. The default is for Guile to do the
fastest safe thing: use the garbage collector for GMP when using the
included ``mini-GMP'', but not otherwise. Set this variable to nonzero
to force GMP to use garbage-collected memory, even when using system GC.
@item GUILE_JIT_THRESHOLD
@vindex GUILE_JIT_THRESHOLD
Guile has a just-in-time (JIT) code generator that makes running Guile

9
libguile/numbers.c
View file

@ -10412,6 +10412,15 @@ SCM_PRIMITIVE_GENERIC (scm_sqrt, "sqrt", 1, 0, 0,
void
scm_init_numbers ()
{
/* Give the user the chance to force the use of libgc to manage gmp
digits, if we know there are no external GMP users in this process.
Can be an important optimization for those who link external GMP,
before we switch to the MPN API. */
if (!SCM_ENABLE_MINI_GMP)
scm_install_gmp_memory_functions
= scm_getenv_int ("GUILE_INSTALL_GMP_MEMORY_FUNCTIONS",
scm_install_gmp_memory_functions);
if (scm_install_gmp_memory_functions)
mp_set_memory_functions (custom_gmp_malloc,
custom_gmp_realloc,