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| author | Paul Eggert <eggert@cs.ucla.edu> | 2025-12-02 17:24:43 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2025-12-02 17:46:56 -0800 |
| commit | 1b2b433fc0a62db933399eb37c8cae73e0446e86 (patch) | |
| tree | d9e0b677729ef3dc32ae7be55889df75e982af37 /configure.ac | |
| parent | 3930d12e4dcb2d79d70c3aa8a199aec0340d0b39 (diff) | |
Port to GNU/Linux HPPA malloc
On this platform, you cannot reliably malloc objects containing
values of type pthread_mutex_t or pthread_cond_t, since malloc
guarantees only 8-byte alignment but these two types require
16-byte alignment. See GCC bug 115750
<https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115750> reported by
Sam James and Emacs bug 79936 <https://bugs.gnu.org/79936>
reported by John Paul Adrian Glaubitz.
* configure.ac (ALIGNOF_MAX_ALIGN_T, ALIGNOF_PTHREAD_COND_T)
(ALIGNOF_PTHREAD_MUTEX_T) [HAVE_PTHREAD]: New C macros.
* src/systhread.c (sys_mutex_init, sys_mutex_lock)
(sys_mutex_unlock, sys_cond_init, sys_cond_wait)
(sys_cond_signal, sys_cond_broadcast, sys_cond_destroy):
Use SYTHREAD_ALIGN_PTR to convert sys_mutex_t and sys_cond_t to
pthread_mutex_t and pthread_cond_t, since runtime conversion is
needed on GNU/Linux HPPA.
* src/systhread.h (SYSTHREAD_ALIGN_ROOM, SYSTHREAD_ALIGN_PTR):
New macros, which affect the generated code only on
unusual platforms like GNU/Linux HPPA.
(sys_mutex_t, sys_cond_t) [HAVE_PTHREAD]: Use them.
Diffstat (limited to 'configure.ac')
| -rw-r--r-- | configure.ac | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac index 39f1fb10091..d17dbfa4358 100644 --- a/configure.ac +++ b/configure.ac @@ -3425,6 +3425,12 @@ if test "$ac_cv_header_pthread_h" && test "$opsys" != "mingw32"; then done]) if test "$emacs_cv_pthread_lib" != no; then AC_DEFINE([HAVE_PTHREAD], [1], [Define to 1 if you have POSIX threads.]) + m4_foreach([emacs_type], + [[max_align_t], [pthread_cond_t], [pthread_mutex_t]], + [AC_CHECK_ALIGNOF(emacs_type, + [[#include <stddef.h> + #include <pthread.h> + ]])]) case $emacs_cv_pthread_lib in -*) LIB_PTHREAD=$emacs_cv_pthread_lib;; esac |