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Create an internal semaphore API that is not tied to SysV semaphores.

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As proof of concept, provide an alternate implementation based on POSIX
semaphores.  Also push the SysV shared-memory implementation into a
separate file so that it can be replaced conveniently.
This commit is contained in:
Tom Lane
2002-05-05 00:03:29 +00:00
parent 91fc10fdac
commit 72a3902a66
37 changed files with 1659 additions and 1370 deletions
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40
configure vendored
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@ -15664,6 +15664,42 @@ HAVE_POSIX_SIGNALS=$pgac_cv_func_posix_signals
# Select semaphore implementation type.
if test x"$USE_NAMED_POSIX_SEMAPHORES" = x"1" ; then
cat >>confdefs.h <<\_ACEOF
#define USE_NAMED_POSIX_SEMAPHORES 1
_ACEOF
SEMA_IMPLEMENTATION="src/backend/port/posix_sema.c"
else
if test x"$USE_UNNAMED_POSIX_SEMAPHORES" = x"1" ; then
cat >>confdefs.h <<\_ACEOF
#define USE_UNNAMED_POSIX_SEMAPHORES 1
_ACEOF
SEMA_IMPLEMENTATION="src/backend/port/posix_sema.c"
else
cat >>confdefs.h <<\_ACEOF
#define USE_SYSV_SEMAPHORES 1
_ACEOF
SEMA_IMPLEMENTATION="src/backend/port/sysv_sema.c"
fi
fi
# Select shared-memory implementation type.
cat >>confdefs.h <<\_ACEOF
#define USE_SYSV_SHARED_MEMORY 1
_ACEOF
SHMEM_IMPLEMENTATION="src/backend/port/sysv_shmem.c"
if test "$enable_nls" = yes ; then
echo "$as_me:$LINENO: checking for library containing gettext" >&5
@ -16724,7 +16760,7 @@ fi
ac_config_files="$ac_config_files GNUmakefile src/Makefile.global"
ac_config_links="$ac_config_links src/backend/port/dynloader.c:src/backend/port/dynloader/${template}.c src/include/dynloader.h:src/backend/port/dynloader/${template}.h src/include/pg_config_os.h:src/include/port/${template}.h src/Makefile.port:src/makefiles/Makefile.${template}"
ac_config_links="$ac_config_links src/backend/port/dynloader.c:src/backend/port/dynloader/${template}.c src/backend/port/pg_sema.c:${SEMA_IMPLEMENTATION} src/backend/port/pg_shmem.c:${SHMEM_IMPLEMENTATION} src/include/dynloader.h:src/backend/port/dynloader/${template}.h src/include/pg_config_os.h:src/include/port/${template}.h src/Makefile.port:src/makefiles/Makefile.${template}"
ac_config_headers="$ac_config_headers src/include/pg_config.h"
@ -17207,6 +17243,8 @@ do
"src/Makefile.global" ) CONFIG_FILES="$CONFIG_FILES src/Makefile.global" ;;
"src/backend/port/tas.s" ) CONFIG_LINKS="$CONFIG_LINKS src/backend/port/tas.s:src/backend/port/tas/${tas_file}" ;;
"src/backend/port/dynloader.c" ) CONFIG_LINKS="$CONFIG_LINKS src/backend/port/dynloader.c:src/backend/port/dynloader/${template}.c" ;;
"src/backend/port/pg_sema.c" ) CONFIG_LINKS="$CONFIG_LINKS src/backend/port/pg_sema.c:${SEMA_IMPLEMENTATION}" ;;
"src/backend/port/pg_shmem.c" ) CONFIG_LINKS="$CONFIG_LINKS src/backend/port/pg_shmem.c:${SHMEM_IMPLEMENTATION}" ;;
"src/include/dynloader.h" ) CONFIG_LINKS="$CONFIG_LINKS src/include/dynloader.h:src/backend/port/dynloader/${template}.h" ;;
"src/include/pg_config_os.h" ) CONFIG_LINKS="$CONFIG_LINKS src/include/pg_config_os.h:src/include/port/${template}.h" ;;
"src/Makefile.port" ) CONFIG_LINKS="$CONFIG_LINKS src/Makefile.port:src/makefiles/Makefile.${template}" ;;