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Re: [PATCH v2 3/3] nptl: Define __PTHREAD_MUTEX_{NUSERS_AFTER_KIND,USE_UNION}
- From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
- To: libc-alpha at sourceware dot org
- Date: Thu, 2 Nov 2017 10:14:37 -0200
- Subject: Re: [PATCH v2 3/3] nptl: Define __PTHREAD_MUTEX_{NUSERS_AFTER_KIND,USE_UNION}
- Authentication-results: sourceware.org; auth=none
- References: <1509038067-18532-1-git-send-email-adhemerval.zanella@linaro.org> <1509038067-18532-3-git-send-email-adhemerval.zanella@linaro.org>
Ping.
On 26/10/2017 15:14, Adhemerval Zanella wrote:
> Changes from previous version:
>
> - Fixed __nusers placement for __PTHREAD_MUTEX_NUSERS_AFTER_KIND.
> - Fixed typos.
>
> ---
>
> This patch adds two new internal defines to set the internal
> pthread_mutex_t layout required by the supported ABIS:
>
> 1. __PTHREAD_MUTEX_NUSERS_AFTER_KIND which control whether to define
> __nusers fields before or after __kind. The preferred value for
> is 0 for new ports and it sets __nusers before __kind.
>
> 2. __PTHREAD_MUTEX_USE_UNION which control whether internal __spins and
> __list members will be place inside an union for linuxthreads
> compatibility. The preferred value is 0 for ports and it sets
> to not use an union to define both fields.
>
> It fixes the wrong offsets value for __kind value on x86_64-linux-gnu-x32.
> Checked with a make check run-built-tests=no on all afected ABIs.
>
> Signed-off-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
>
> [BZ #22298]
> * nptl/allocatestack.c (allocate_stack): Check if
> __PTHREAD_MUTEX_HAVE_PREV is non-zero, instead if
> __PTHREAD_MUTEX_HAVE_PREV is defined.
> * nptl/descr.h (pthread): Likewise.
> * nptl/nptl-init.c (__pthread_initialize_minimal_internal):
> Likewise.
> * nptl/pthread_create.c (START_THREAD_DEFN): Likewise.
> * sysdeps/nptl/fork.c (__libc_fork): Likewise.
> * sysdeps/nptl/pthread.h (PTHREAD_MUTEX_INITIALIZER): Likewise.
> * sysdeps/nptl/bits/thread-shared-types.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> (__pthread_internal_list): Check __PTHREAD_MUTEX_USE_UNION instead
> of __WORDSIZE for internal layout.
> (__pthread_mutex_s): Check __PTHREAD_MUTEX_NUSERS_AFTER_KIND instead
> of __WORDSIZE for internal __nusers layout and __PTHREAD_MUTEX_USE_UNION
> instead of __WORDSIZE whether to use an union for __spins and __list
> fields.
> (__PTHREAD_MUTEX_HAVE_PREV): Define also for __PTHREAD_MUTEX_USE_UNION
> case.
> * sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/alpha/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/arm/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/ia64/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/m68k/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/mips/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/nios2/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/s390/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/sh/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/sparc/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/tile/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> * sysdeps/x86/nptl/bits/pthreadtypes-arch.h
> (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> defines.
> ---
> ChangeLog | 67 ++++++++++++++++++++++++
> nptl/allocatestack.c | 2 +-
> nptl/descr.h | 2 +-
> nptl/nptl-init.c | 2 +-
> nptl/pthread_create.c | 4 +-
> sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/alpha/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/arm/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/hppa/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/ia64/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/m68k/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/mips/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/nios2/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/nptl/bits/thread-shared-types.h | 32 +++++++++--
> sysdeps/nptl/fork.c | 2 +-
> sysdeps/nptl/pthread.h | 2 +-
> sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/s390/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/sh/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/sparc/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/tile/nptl/bits/pthreadtypes-arch.h | 2 +
> sysdeps/x86/nptl/bits/pthreadtypes-arch.h | 7 +++
> 23 files changed, 136 insertions(+), 12 deletions(-)
>
> diff --git a/ChangeLog b/ChangeLog
> index 09e25be..203f014 100644
> --- a/ChangeLog
> +++ b/ChangeLog
> @@ -1,5 +1,72 @@
> 2017-10-25 Adhemerval Zanella <adhemerval.zanella@linaro.org>
>
> + [BZ #22298]
> + * nptl/allocatestack.c (allocate_stack): Check if
> + __PTHREAD_MUTEX_HAVE_PREV is non-zero, instead if
> + __PTHREAD_MUTEX_HAVE_PREV is defined.
> + * nptl/descr.h (pthread): Likewise.
> + * nptl/nptl-init.c (__pthread_initialize_minimal_internal):
> + Likewise.
> + * nptl/pthread_create.c (START_THREAD_DEFN): Likewise.
> + * sysdeps/nptl/fork.c (__libc_fork): Likewise.
> + * sysdeps/nptl/pthread.h (PTHREAD_MUTEX_INITIALIZER): Likewise.
> + * sysdeps/nptl/bits/thread-shared-types.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + (__pthread_internal_list): Check __PTHREAD_MUTEX_USE_UNION instead
> + of __WORDSIZE for internal layout.
> + (__pthread_mutex_s): Check __PTHREAD_MUTEX_NUSERS_AFTER_KIND instead
> + of __WORDSIZE for internal __nusers layout and __PTHREAD_MUTEX_USE_UNION
> + instead of __WORDSIZE whether to use an union for __spins and __list
> + fields.
> + (__PTHREAD_MUTEX_HAVE_PREV): Define also for __PTHREAD_MUTEX_USE_UNION
> + case.
> + * sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/alpha/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/arm/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/ia64/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/m68k/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/mips/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/nios2/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/s390/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/sh/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/sparc/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/tile/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> + * sysdeps/x86/nptl/bits/pthreadtypes-arch.h
> + (__PTHREAD_MUTEX_NUSERS_AFTER_KIND, __PTHREAD_MUTEX_USE_UNION): New
> + defines.
> +
> * nptl/pthreadP.h (ASSERT_TYPE_SIZE, ASSERT_PTHREAD_INTERNAL_SIZE):
> New macros.
> * nptl/pthread_attr_init.c (__pthread_mutex_init): Add build time
> diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
> index ad9add8..1cc7893 100644
> --- a/nptl/allocatestack.c
> +++ b/nptl/allocatestack.c
> @@ -753,7 +753,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
> - offsetof (pthread_mutex_t,
> __data.__list.__next));
> pd->robust_head.list_op_pending = NULL;
> -#ifdef __PTHREAD_MUTEX_HAVE_PREV
> +#if __PTHREAD_MUTEX_HAVE_PREV
> pd->robust_prev = &pd->robust_head;
> #endif
> pd->robust_head.list = &pd->robust_head;
> diff --git a/nptl/descr.h b/nptl/descr.h
> index c5ad0c8..c83b17b 100644
> --- a/nptl/descr.h
> +++ b/nptl/descr.h
> @@ -169,7 +169,7 @@ struct pthread
> pid_t pid_ununsed;
>
> /* List of robust mutexes the thread is holding. */
> -#ifdef __PTHREAD_MUTEX_HAVE_PREV
> +#if __PTHREAD_MUTEX_HAVE_PREV
> void *robust_prev;
> struct robust_list_head robust_head;
>
> diff --git a/nptl/nptl-init.c b/nptl/nptl-init.c
> index 2921607..869e926 100644
> --- a/nptl/nptl-init.c
> +++ b/nptl/nptl-init.c
> @@ -297,7 +297,7 @@ __pthread_initialize_minimal_internal (void)
>
> /* Initialize the robust mutex data. */
> {
> -#ifdef __PTHREAD_MUTEX_HAVE_PREV
> +#if __PTHREAD_MUTEX_HAVE_PREV
> pd->robust_prev = &pd->robust_head;
> #endif
> pd->robust_head.list = &pd->robust_head;
> diff --git a/nptl/pthread_create.c b/nptl/pthread_create.c
> index 992331e..51ae60d 100644
> --- a/nptl/pthread_create.c
> +++ b/nptl/pthread_create.c
> @@ -518,7 +518,7 @@ START_THREAD_DEFN
>
> #ifndef __ASSUME_SET_ROBUST_LIST
> /* If this thread has any robust mutexes locked, handle them now. */
> -# ifdef __PTHREAD_MUTEX_HAVE_PREV
> +# if __PTHREAD_MUTEX_HAVE_PREV
> void *robust = pd->robust_head.list;
> # else
> __pthread_slist_t *robust = pd->robust_list.__next;
> @@ -536,7 +536,7 @@ START_THREAD_DEFN
> __list.__next));
> robust = *((void **) robust);
>
> -# ifdef __PTHREAD_MUTEX_HAVE_PREV
> +# if __PTHREAD_MUTEX_HAVE_PREV
> this->__list.__prev = NULL;
> # endif
> this->__list.__next = NULL;
> diff --git a/sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h b/sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h
> index d13a75d..9ab23d0 100644
> --- a/sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/aarch64/nptl/bits/pthreadtypes-arch.h
> @@ -45,6 +45,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
> +#define __PTHREAD_MUTEX_USE_UNION 0
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/alpha/nptl/bits/pthreadtypes-arch.h b/sysdeps/alpha/nptl/bits/pthreadtypes-arch.h
> index b6f6cb1..429df10 100644
> --- a/sysdeps/alpha/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/alpha/nptl/bits/pthreadtypes-arch.h
> @@ -33,6 +33,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
> +#define __PTHREAD_MUTEX_USE_UNION 0
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/arm/nptl/bits/pthreadtypes-arch.h b/sysdeps/arm/nptl/bits/pthreadtypes-arch.h
> index 3f9eca4..3911c81 100644
> --- a/sysdeps/arm/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/arm/nptl/bits/pthreadtypes-arch.h
> @@ -34,6 +34,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/hppa/nptl/bits/pthreadtypes-arch.h b/sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
> index c158562..865a14e 100644
> --- a/sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/hppa/nptl/bits/pthreadtypes-arch.h
> @@ -48,6 +48,8 @@
> pthread_mutex_t is larger than Linuxthreads. */
> #define __PTHREAD_COMPAT_PADDING_END int __reserved[2];
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT __attribute__ ((__aligned__(16)))
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/ia64/nptl/bits/pthreadtypes-arch.h b/sysdeps/ia64/nptl/bits/pthreadtypes-arch.h
> index 631cb33..2a3bc75 100644
> --- a/sysdeps/ia64/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/ia64/nptl/bits/pthreadtypes-arch.h
> @@ -33,6 +33,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
> +#define __PTHREAD_MUTEX_USE_UNION 0
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/m68k/nptl/bits/pthreadtypes-arch.h b/sysdeps/m68k/nptl/bits/pthreadtypes-arch.h
> index 845b9e6..966cc75 100644
> --- a/sysdeps/m68k/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/m68k/nptl/bits/pthreadtypes-arch.h
> @@ -35,6 +35,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT __attribute__ ((__aligned__ (4)))
> #define __ONCE_ALIGNMENT __attribute__ ((__aligned__ (4)))
> diff --git a/sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h b/sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h
> index d687e2c..e44f2dc 100644
> --- a/sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/microblaze/nptl/bits/pthreadtypes-arch.h
> @@ -35,6 +35,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/mips/nptl/bits/pthreadtypes-arch.h b/sysdeps/mips/nptl/bits/pthreadtypes-arch.h
> index 6aa1bda..f03389a 100644
> --- a/sysdeps/mips/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/mips/nptl/bits/pthreadtypes-arch.h
> @@ -42,6 +42,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND (_MIPS_SIM != _ABI64)
> +#define __PTHREAD_MUTEX_USE_UNION (_MIPS_SIM != _ABI64)
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/nios2/nptl/bits/pthreadtypes-arch.h b/sysdeps/nios2/nptl/bits/pthreadtypes-arch.h
> index e2732f9..83f8684 100644
> --- a/sysdeps/nios2/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/nios2/nptl/bits/pthreadtypes-arch.h
> @@ -35,6 +35,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/nptl/bits/thread-shared-types.h b/sysdeps/nptl/bits/thread-shared-types.h
> index 68b82b6..da4358a 100644
> --- a/sysdeps/nptl/bits/thread-shared-types.h
> +++ b/sysdeps/nptl/bits/thread-shared-types.h
> @@ -42,6 +42,25 @@
> the internal structure.
> __PTHREAD_MUTEX_LOCK_ELISION - 1 if the architecture supports lock
> elision or 0 otherwise.
> + __PTHREAD_MUTEX_NUSERS_AFTER_KIND - control where to put __nusers. The
> + preferred value for new architectures
> + is 0.
> + __PTHREAD_MUTEX_USE_UNION - control whether internal __spins and
> + __list will be place inside a union for
> + linuxthreads compatibility.
> + The preferred value for new architectures
> + is 0.
> +
> + For a new port the preferred values for the required defines are:
> +
> + #define __PTHREAD_COMPAT_PADDING_MID
> + #define __PTHREAD_COMPAT_PADDING_END
> + #define __PTHREAD_MUTEX_LOCK_ELISION 0
> + #define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
> + #define __PTHREAD_MUTEX_USE_UNION 0
> +
> + __PTHREAD_MUTEX_LOCK_ELISION can be set to 1 if the hardware plans to
> + eventually support lock elision using transactional memory.
>
> The additional macro defines any constraint for the lock alignment
> inside the thread structures:
> @@ -59,7 +78,7 @@
>
> /* Common definition of pthread_mutex_t. */
>
> -#if __WORDSIZE == 64
> +#if !__PTHREAD_MUTEX_USE_UNION
> typedef struct __pthread_internal_list
> {
> struct __pthread_internal_list *__prev;
> @@ -74,7 +93,7 @@ typedef struct __pthread_internal_slist
>
> /* Lock elision support. */
> #if __PTHREAD_MUTEX_LOCK_ELISION
> -# if __WORDSIZE == 64
> +# if !__PTHREAD_MUTEX_USE_UNION
> # define __PTHREAD_SPINS_DATA \
> short __spins; \
> short __elision
> @@ -101,24 +120,27 @@ struct __pthread_mutex_s
> int __lock __LOCK_ALIGNMENT;
> unsigned int __count;
> int __owner;
> -#if __WORDSIZE == 64
> +#if !__PTHREAD_MUTEX_NUSERS_AFTER_KIND
> unsigned int __nusers;
> #endif
> /* KIND must stay at this position in the structure to maintain
> binary compatibility with static initializers. */
> int __kind;
> __PTHREAD_COMPAT_PADDING_MID
> -#if __WORDSIZE == 64
> +#if __PTHREAD_MUTEX_NUSERS_AFTER_KIND
> + unsigned int __nusers;
> +#endif
> +#if !__PTHREAD_MUTEX_USE_UNION
> __PTHREAD_SPINS_DATA;
> __pthread_list_t __list;
> # define __PTHREAD_MUTEX_HAVE_PREV 1
> #else
> - unsigned int __nusers;
> __extension__ union
> {
> __PTHREAD_SPINS_DATA;
> __pthread_slist_t __list;
> };
> +# define __PTHREAD_MUTEX_HAVE_PREV 0
> #endif
> __PTHREAD_COMPAT_PADDING_END
> };
> diff --git a/sysdeps/nptl/fork.c b/sysdeps/nptl/fork.c
> index 4bb87e2..48676c2 100644
> --- a/sysdeps/nptl/fork.c
> +++ b/sysdeps/nptl/fork.c
> @@ -166,7 +166,7 @@ __libc_fork (void)
> inherit the correct value from the parent. We do not need to clear
> the pending operation because it must have been zero when fork was
> called. */
> -# ifdef __PTHREAD_MUTEX_HAVE_PREV
> +# if __PTHREAD_MUTEX_HAVE_PREV
> self->robust_prev = &self->robust_head;
> # endif
> self->robust_head.list = &self->robust_head;
> diff --git a/sysdeps/nptl/pthread.h b/sysdeps/nptl/pthread.h
> index 632ea7b..2b2b386 100644
> --- a/sysdeps/nptl/pthread.h
> +++ b/sysdeps/nptl/pthread.h
> @@ -83,7 +83,7 @@ enum
> #endif
>
>
> -#ifdef __PTHREAD_MUTEX_HAVE_PREV
> +#if __PTHREAD_MUTEX_HAVE_PREV
> # define PTHREAD_MUTEX_INITIALIZER \
> { { 0, 0, 0, 0, 0, __PTHREAD_SPINS, { 0, 0 } } }
> # ifdef __USE_GNU
> diff --git a/sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h b/sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h
> index f29119b..8158cb5 100644
> --- a/sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/powerpc/nptl/bits/pthreadtypes-arch.h
> @@ -42,6 +42,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 1
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND (__WORDSIZE != 64)
> +#define __PTHREAD_MUTEX_USE_UNION (__WORDSIZE != 64)
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/s390/nptl/bits/pthreadtypes-arch.h b/sysdeps/s390/nptl/bits/pthreadtypes-arch.h
> index 3a9ac57..1ae2773 100644
> --- a/sysdeps/s390/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/s390/nptl/bits/pthreadtypes-arch.h
> @@ -45,6 +45,8 @@
> #else
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> #endif
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND (__WORDSIZE != 64)
> +#define __PTHREAD_MUTEX_USE_UNION (__WORDSIZE != 64)
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/sh/nptl/bits/pthreadtypes-arch.h b/sysdeps/sh/nptl/bits/pthreadtypes-arch.h
> index b2615fe..e707751 100644
> --- a/sysdeps/sh/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/sh/nptl/bits/pthreadtypes-arch.h
> @@ -34,6 +34,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +#define __PTHREAD_MUTEX_USE_UNION 1
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/sparc/nptl/bits/pthreadtypes-arch.h b/sysdeps/sparc/nptl/bits/pthreadtypes-arch.h
> index 1e188cf..0f96f37 100644
> --- a/sysdeps/sparc/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/sparc/nptl/bits/pthreadtypes-arch.h
> @@ -43,6 +43,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND (__WORDSIZE != 64)
> +#define __PTHREAD_MUTEX_USE_UNION (__WORDSIZE != 64)
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/tile/nptl/bits/pthreadtypes-arch.h b/sysdeps/tile/nptl/bits/pthreadtypes-arch.h
> index 145ee42..054474f 100644
> --- a/sysdeps/tile/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/tile/nptl/bits/pthreadtypes-arch.h
> @@ -43,6 +43,8 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 0
> +#define __PTHREAD_MUTEX_NUSERS_AFTER_KIND (__WORDSIZE != 64)
> +#define __PTHREAD_MUTEX_USE_UNION (__WORDSIZE != 64)
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
> diff --git a/sysdeps/x86/nptl/bits/pthreadtypes-arch.h b/sysdeps/x86/nptl/bits/pthreadtypes-arch.h
> index fd86806..74d5f6d 100644
> --- a/sysdeps/x86/nptl/bits/pthreadtypes-arch.h
> +++ b/sysdeps/x86/nptl/bits/pthreadtypes-arch.h
> @@ -51,6 +51,13 @@
> #define __PTHREAD_COMPAT_PADDING_MID
> #define __PTHREAD_COMPAT_PADDING_END
> #define __PTHREAD_MUTEX_LOCK_ELISION 1
> +#ifdef __x86_64__
> +# define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 0
> +# define __PTHREAD_MUTEX_USE_UNION 0
> +#else
> +# define __PTHREAD_MUTEX_NUSERS_AFTER_KIND 1
> +# define __PTHREAD_MUTEX_USE_UNION 1
> +#endif
>
> #define __LOCK_ALIGNMENT
> #define __ONCE_ALIGNMENT
>