# $Id: mutex.ac,v 11.38 2002/07/25 20:07:52 sue Exp $ # POSIX pthreads tests: inter-process safe and intra-process only. # # We need to run a test here, because the PTHREAD_PROCESS_SHARED flag compiles # fine on problematic systems, but won't actually work. This is a problem for # cross-compilation environments. I think inter-process mutexes are as likely # to fail in cross-compilation environments as real ones (especially since the # likely cross-compilation environment is Linux, where inter-process mutexes # don't currently work -- the latest estimate I've heard is Q1 2002, as part # of IBM's NGPT package). So: # # If checking for inter-process pthreads mutexes: # If it's local, run a test. # If it's a cross-compilation, fail. # # If the user specified pthreads mutexes and we're checking for intra-process # mutexes only: # If it's local, run a test. # If it's a cross-compilation, run a link-test. # # So, the thing you can't do here is configure for inter-process POSIX pthread # mutexes when cross-compiling. Since we're using the GNU/Cygnus toolchain for # cross-compilation, the target system is likely Linux or *BSD, so we're doing # the right thing. AC_DEFUN(AM_PTHREADS_SHARED, [ AC_TRY_RUN([ #include <pthread.h> main() { pthread_cond_t cond; pthread_mutex_t mutex; pthread_condattr_t condattr; pthread_mutexattr_t mutexattr; exit ( pthread_condattr_init(&condattr) || pthread_condattr_setpshared(&condattr, PTHREAD_PROCESS_SHARED) || pthread_mutexattr_init(&mutexattr) || pthread_mutexattr_setpshared(&mutexattr, PTHREAD_PROCESS_SHARED) || pthread_cond_init(&cond, &condattr) || pthread_mutex_init(&mutex, &mutexattr) || pthread_mutex_lock(&mutex) || pthread_mutex_unlock(&mutex) || pthread_mutex_destroy(&mutex) || pthread_cond_destroy(&cond) || pthread_condattr_destroy(&condattr) || pthread_mutexattr_destroy(&mutexattr)); }], [db_cv_mutex="$1"],, [db_cv_mutex="no"])]) AC_DEFUN(AM_PTHREADS_PRIVATE, [ AC_TRY_RUN([ #include <pthread.h> main() { pthread_cond_t cond; pthread_mutex_t mutex; pthread_condattr_t condattr; pthread_mutexattr_t mutexattr; exit ( pthread_condattr_init(&condattr) || pthread_mutexattr_init(&mutexattr) || pthread_cond_init(&cond, &condattr) || pthread_mutex_init(&mutex, &mutexattr) || pthread_mutex_lock(&mutex) || pthread_mutex_unlock(&mutex) || pthread_mutex_destroy(&mutex) || pthread_cond_destroy(&cond) || pthread_condattr_destroy(&condattr) || pthread_mutexattr_destroy(&mutexattr)); }], [db_cv_mutex="$1"],, AC_TRY_LINK([ #include <pthread.h>],[ pthread_cond_t cond; pthread_mutex_t mutex; pthread_condattr_t condattr; pthread_mutexattr_t mutexattr; exit ( pthread_condattr_init(&condattr) || pthread_mutexattr_init(&mutexattr) || pthread_cond_init(&cond, &condattr) || pthread_mutex_init(&mutex, &mutexattr) || pthread_mutex_lock(&mutex) || pthread_mutex_unlock(&mutex) || pthread_mutex_destroy(&mutex) || pthread_cond_destroy(&cond) || pthread_condattr_destroy(&condattr) || pthread_mutexattr_destroy(&mutexattr)); ], [db_cv_mutex="$1"]))]) # Figure out mutexes for this compiler/architecture. AC_DEFUN(AM_DEFINE_MUTEXES, [ # Mutexes we don't test for, but want the #defines to exist for # other ports. AH_TEMPLATE(HAVE_MUTEX_VMS, [Define to 1 to use VMS mutexes.]) AH_TEMPLATE(HAVE_MUTEX_VXWORKS, [Define to 1 to use VxWorks mutexes.]) AH_TEMPLATE(HAVE_MUTEX_WIN32, [Define to 1 to use Windows mutexes.]) AC_CACHE_CHECK([for mutexes], db_cv_mutex, [ db_cv_mutex=no orig_libs=$LIBS # User-specified POSIX or UI mutexes. # # There are two different reasons to specify mutexes: First, the application # is already using one type of mutex and doesn't want to mix-and-match (for # example, on Solaris, which has POSIX, UI and LWP mutexes). Second, the # applications POSIX pthreads mutexes don't support inter-process locking, # but the application wants to use them anyway (for example, current Linux # and *BSD systems). # # If we're on Solaris, we insist that -lthread or -lpthread be used. The # problem is the Solaris C library has UI/POSIX interface stubs, but they're # broken, configuring them for inter-process mutexes doesn't return an error, # but it doesn't work either. Otherwise, we try first without the library # and then with it: there's some information that SCO/UnixWare/OpenUNIX needs # this. [#4950] # # Test for LWP threads before testing for UI/POSIX threads, we prefer them # on Solaris. There's a bug in SunOS 5.7 where applications get pwrite, not # pwrite64, if they load the C library before the appropriate threads library, # e.g., tclsh using dlopen to load the DB library. By using LWP threads we # avoid answering lots of user questions, not to mention the bugs. if test "$db_cv_posixmutexes" = yes; then case "$host_os" in solaris*) db_cv_mutex="posix_library_only";; *) db_cv_mutex="posix_only";; esac fi if test "$db_cv_uimutexes" = yes; then case "$host_os" in solaris*) db_cv_mutex="ui_library_only";; *) db_cv_mutex="ui_only";; esac fi # LWP threads: _lwp_XXX if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <synch.h>],[ static lwp_mutex_t mi = SHAREDMUTEX; static lwp_cond_t ci = SHAREDCV; lwp_mutex_t mutex = mi; lwp_cond_t cond = ci; exit ( _lwp_mutex_lock(&mutex) || _lwp_mutex_unlock(&mutex)); ], [db_cv_mutex="Solaris/lwp"]) fi # UI threads: thr_XXX # # Try with and without the -lthread library. if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "ui_only"; then AC_TRY_LINK([ #include <thread.h> #include <synch.h>],[ mutex_t mutex; cond_t cond; int type = USYNC_PROCESS; exit ( mutex_init(&mutex, type, NULL) || cond_init(&cond, type, NULL) || mutex_lock(&mutex) || mutex_unlock(&mutex)); ], [db_cv_mutex="UI/threads"]) fi if test "$db_cv_mutex" = no -o \ "$db_cv_mutex" = "ui_only" -o "$db_cv_mutex" = "ui_library_only"; then LIBS="$LIBS -lthread" AC_TRY_LINK([ #include <thread.h> #include <synch.h>],[ mutex_t mutex; cond_t cond; int type = USYNC_PROCESS; exit ( mutex_init(&mutex, type, NULL) || cond_init(&cond, type, NULL) || mutex_lock(&mutex) || mutex_unlock(&mutex)); ], [db_cv_mutex="UI/threads/library"]) LIBS="$orig_libs" fi if test "$db_cv_mutex" = "ui_only" -o "$db_cv_mutex" = "ui_library_only"; then AC_MSG_ERROR([unable to find UI mutex interfaces]) fi # POSIX.1 pthreads: pthread_XXX # # Try with and without the -lpthread library. If the user specified we use # POSIX pthreads mutexes, and we fail to find the full interface, try and # configure for just intra-process support. if test "$db_cv_mutex" = no -o "$db_cv_mutex" = "posix_only"; then AM_PTHREADS_SHARED("POSIX/pthreads") fi if test "$db_cv_mutex" = no -o \ "$db_cv_mutex" = "posix_only" -o "$db_cv_mutex" = "posix_library_only"; then LIBS="$LIBS -lpthread" AM_PTHREADS_SHARED("POSIX/pthreads/library") LIBS="$orig_libs" fi if test "$db_cv_mutex" = "posix_only"; then AM_PTHREADS_PRIVATE("POSIX/pthreads/private") fi if test "$db_cv_mutex" = "posix_only" -o \ "$db_cv_mutex" = "posix_library_only"; then LIBS="$LIBS -lpthread" AM_PTHREADS_PRIVATE("POSIX/pthreads/library/private") LIBS="$orig_libs" fi if test "$db_cv_mutex" = "posix_only" -o \ "$db_cv_mutex" = "posix_library_only"; then AC_MSG_ERROR([unable to find POSIX 1003.1 mutex interfaces]) fi # msemaphore: HPPA only # Try HPPA before general msem test, it needs special alignment. if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <sys/mman.h>],[ #if defined(__hppa) typedef msemaphore tsl_t; msemaphore x; msem_init(&x, 0); msem_lock(&x, 0); msem_unlock(&x, 0); exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="HP/msem_init"]) fi # msemaphore: AIX, OSF/1 if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <sys/types.h> #include <sys/mman.h>],[ typedef msemaphore tsl_t; msemaphore x; msem_init(&x, 0); msem_lock(&x, 0); msem_unlock(&x, 0); exit(0); ], [db_cv_mutex="UNIX/msem_init"]) fi # ReliantUNIX if test "$db_cv_mutex" = no; then LIBS="$LIBS -lmproc" AC_TRY_LINK([ #include <ulocks.h>],[ typedef spinlock_t tsl_t; spinlock_t x; initspin(&x, 1); cspinlock(&x); spinunlock(&x); ], [db_cv_mutex="ReliantUNIX/initspin"]) LIBS="$orig_libs" fi # SCO: UnixWare has threads in libthread, but OpenServer doesn't. if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__USLC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="SCO/x86/cc-assembly"]) fi # abilock_t: SGI if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <abi_mutex.h>],[ typedef abilock_t tsl_t; abilock_t x; init_lock(&x); acquire_lock(&x); release_lock(&x); ], [db_cv_mutex="SGI/init_lock"]) fi # sema_t: Solaris # The sema_XXX calls do not work on Solaris 5.5. I see no reason to ever # turn this test on, unless we find some other platform that uses the old # POSIX.1 interfaces. (I plan to move directly to pthreads on Solaris.) if test "$db_cv_mutex" = DOESNT_WORK; then AC_TRY_LINK([ #include <synch.h>],[ typedef sema_t tsl_t; sema_t x; sema_init(&x, 1, USYNC_PROCESS, NULL); sema_wait(&x); sema_post(&x); ], [db_cv_mutex="UNIX/sema_init"]) fi # _lock_try/_lock_clear: Solaris # On Solaris systems without Pthread or UI mutex interfaces, DB uses the # undocumented _lock_try _lock_clear function calls instead of either the # sema_trywait(3T) or sema_wait(3T) function calls. This is because of # problems in those interfaces in some releases of the Solaris C library. if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <sys/machlock.h>],[ typedef lock_t tsl_t; lock_t x; _lock_try(&x); _lock_clear(&x); ], [db_cv_mutex="Solaris/_lock_try"]) fi # _check_lock/_clear_lock: AIX if test "$db_cv_mutex" = no; then AC_TRY_LINK([ #include <sys/atomic_op.h>],[ int x; _check_lock(&x,0,1); _clear_lock(&x,0); ], [db_cv_mutex="AIX/_check_lock"]) fi # Alpha/gcc: OSF/1 if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__alpha) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="ALPHA/gcc-assembly"]) fi # ARM/gcc: Linux if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__arm__) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="ARM/gcc-assembly"]) fi # PaRisc/gcc: HP/UX if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if (defined(__hppa) || defined(__hppa__)) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="HPPA/gcc-assembly"]) fi # PPC/gcc: # Test for Apple first, it requires slightly different assembly. if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if (defined(__powerpc__) || defined(__ppc__)) && defined(__GNUC__) && defined(__APPLE__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="PPC_APPLE/gcc-assembly"]) fi if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if (defined(__powerpc__) || defined(__ppc__)) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="PPC_GENERIC/gcc-assembly"]) fi # Sparc/gcc: SunOS, Solaris if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__sparc__) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="Sparc/gcc-assembly"]) fi # 68K/gcc: SunOS if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if (defined(mc68020) || defined(sun3)) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="68K/gcc-assembly"]) fi # x86/gcc: FreeBSD, NetBSD, BSD/OS, Linux if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if (defined(i386) || defined(__i386__)) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="x86/gcc-assembly"]) fi # S390/gcc: Linux if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__s390__) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="S390/gcc-assembly"]) fi # ia86/gcc: Linux if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(__ia64) && defined(__GNUC__) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="ia64/gcc-assembly"]) fi # uts/cc: UTS if test "$db_cv_mutex" = no; then AC_TRY_COMPILE(,[ #if defined(_UTS) exit(0); #else FAIL TO COMPILE/LINK #endif ], [db_cv_mutex="UTS/cc-assembly"]) fi # default to UNIX fcntl system call mutexes. if test "$db_cv_mutex" = no; then db_cv_mutex="UNIX/fcntl" fi ]) case "$db_cv_mutex" in 68K/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_68K_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_68K_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and 68K assembly language mutexes.]);; AIX/_check_lock) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_AIX_CHECK_LOCK) AH_TEMPLATE(HAVE_MUTEX_AIX_CHECK_LOCK, [Define to 1 to use the AIX _check_lock mutexes.]);; ALPHA/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_ALPHA_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_ALPHA_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and Alpha assembly language mutexes.]);; ARM/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_ARM_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_ARM_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and ARM assembly language mutexes.]);; HP/msem_init) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_HPPA_MSEM_INIT) AH_TEMPLATE(HAVE_MUTEX_HPPA_MSEM_INIT, [Define to 1 to use the msem_XXX mutexes on HP-UX.]);; HPPA/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_HPPA_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_HPPA_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and PaRisc assembly language mutexes.]);; ia64/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_IA64_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_IA64_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and IA64 assembly language mutexes.]);; POSIX/pthreads) ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PTHREADS) AH_TEMPLATE(HAVE_MUTEX_PTHREADS, [Define to 1 to use POSIX 1003.1 pthread_XXX mutexes.]);; POSIX/pthreads/private) ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PTHREADS) AH_TEMPLATE(HAVE_MUTEX_PTHREADS, [Define to 1 to use POSIX 1003.1 pthread_XXX mutexes.]) AC_DEFINE(HAVE_MUTEX_THREAD_ONLY) AH_TEMPLATE(HAVE_MUTEX_THREAD_ONLY, [Define to 1 to configure mutexes intra-process only.]);; POSIX/pthreads/library) LIBS="$LIBS -lpthread" ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PTHREADS) AH_TEMPLATE(HAVE_MUTEX_PTHREADS, [Define to 1 to use POSIX 1003.1 pthread_XXX mutexes.]);; POSIX/pthreads/library/private) LIBS="$LIBS -lpthread" ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PTHREADS) AH_TEMPLATE(HAVE_MUTEX_PTHREADS, [Define to 1 to use POSIX 1003.1 pthread_XXX mutexes.]) AC_DEFINE(HAVE_MUTEX_THREAD_ONLY) AH_TEMPLATE(HAVE_MUTEX_THREAD_ONLY, [Define to 1 to configure mutexes intra-process only.]);; PPC_GENERIC/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PPC_GENERIC_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_PPC_GENERIC_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and generic PowerPC assembly language.]);; PPC_APPLE/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_PPC_APPLE_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_PPC_APPLE_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and Apple PowerPC assembly language.]);; ReliantUNIX/initspin) LIBS="$LIBS -lmproc" ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_RELIANTUNIX_INITSPIN) AH_TEMPLATE(HAVE_MUTEX_RELIANTUNIX_INITSPIN, [Define to 1 to use Reliant UNIX initspin mutexes.]);; S390/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_S390_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_S390_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and S/390 assembly language mutexes.]);; SCO/x86/cc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SCO_X86_CC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_SCO_X86_CC_ASSEMBLY, [Define to 1 to use the SCO compiler and x86 assembly language mutexes.]);; SGI/init_lock) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SGI_INIT_LOCK) AH_TEMPLATE(HAVE_MUTEX_SGI_INIT_LOCK, [Define to 1 to use the SGI XXX_lock mutexes.]);; Solaris/_lock_try) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SOLARIS_LOCK_TRY) AH_TEMPLATE(HAVE_MUTEX_SOLARIS_LOCK_TRY, [Define to 1 to use the Solaris _lock_XXX mutexes.]);; Solaris/lwp) ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SOLARIS_LWP) AH_TEMPLATE(HAVE_MUTEX_SOLARIS_LWP, [Define to 1 to use the Solaris lwp threads mutexes.]);; Sparc/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SPARC_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_SPARC_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and Sparc assembly language mutexes.]);; UI/threads) ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_UI_THREADS) AH_TEMPLATE(HAVE_MUTEX_UI_THREADS, [Define to 1 to use the UNIX International mutexes.]);; UI/threads/library) LIBS="$LIBS -lthread" ADDITIONAL_OBJS="mut_pthread${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_UI_THREADS) AH_TEMPLATE(HAVE_MUTEX_UI_THREADS, [Define to 1 to use the UNIX International mutexes.]);; UNIX/msem_init) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_MSEM_INIT) AH_TEMPLATE(HAVE_MUTEX_MSEM_INIT, [Define to 1 to use the msem_XXX mutexes on systems other than HP-UX.]);; UNIX/sema_init) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_SEMA_INIT) AH_TEMPLATE(HAVE_MUTEX_SEMA_INIT, [Define to 1 to use the obsolete POSIX 1003.1 sema_XXX mutexes.]);; UTS/cc-assembly) ADDITIONAL_OBJS="$ADDITIONAL_OBJS uts4.cc${o}" AC_DEFINE(HAVE_MUTEX_UTS_CC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_UTS_CC_ASSEMBLY, [Define to 1 to use the UTS compiler and assembly language mutexes.]);; x86/gcc-assembly) ADDITIONAL_OBJS="mut_tas${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_X86_GCC_ASSEMBLY) AH_TEMPLATE(HAVE_MUTEX_X86_GCC_ASSEMBLY, [Define to 1 to use the GCC compiler and x86 assembly language mutexes.]);; UNIX/fcntl) AC_MSG_WARN( [NO FAST MUTEXES FOUND FOR THIS COMPILER/ARCHITECTURE.]) ADDITIONAL_OBJS="mut_fcntl${o} $ADDITIONAL_OBJS" AC_DEFINE(HAVE_MUTEX_FCNTL) AH_TEMPLATE(HAVE_MUTEX_FCNTL, [Define to 1 to use the UNIX fcntl system call mutexes.]);; *) AC_MSG_ERROR([Unknown mutex interface: $db_cv_mutex]);; esac if test "$db_cv_mutex" != "UNIX/fcntl"; then AC_DEFINE(HAVE_MUTEX_THREADS) AH_TEMPLATE(HAVE_MUTEX_THREADS, [Define to 1 if fast mutexes are available.]) fi # There are 3 classes of mutexes: # # 1: Mutexes requiring no cleanup, for example, test-and-set mutexes. # 2: Mutexes that must be destroyed, but which don't hold permanent system # resources, for example, pthread mutexes on MVS aka OS/390 aka z/OS. # 3: Mutexes that must be destroyed, even after the process is gone, for # example, pthread mutexes on QNX and binary semaphores on VxWorks. # # DB cannot currently distinguish between #2 and #3 because DB does not know # if the application is running environment recovery as part of startup and # does not need to do cleanup, or if the environment is being removed and/or # recovered in a loop in the application, and so does need to clean up. If # we get it wrong, we're going to call the mutex destroy routine on a random # piece of memory, which usually works, but just might drop core. For now, # we group #2 and #3 into the HAVE_MUTEX_SYSTEM_RESOURCES define, until we # have a better solution or reason to solve this in a general way -- so far, # the places we've needed to handle this are few. AH_TEMPLATE(HAVE_MUTEX_SYSTEM_RESOURCES, [Define to 1 if mutexes hold system resources.]) case "$host_os$db_cv_mutex" in *qnx*POSIX/pthread*|openedition*POSIX/pthread*) AC_DEFINE(HAVE_MUTEX_SYSTEM_RESOURCES);; esac])