diff options
Diffstat (limited to 'sysdeps/nptl/bits/thread-shared-types.h')
| -rw-r--r-- | sysdeps/nptl/bits/thread-shared-types.h | 32 |
1 files changed, 27 insertions, 5 deletions
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 }; |