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Diffstat (limited to 'sysdeps/nptl/bits/thread-shared-types.h')
| -rw-r--r-- | sysdeps/nptl/bits/thread-shared-types.h | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/sysdeps/nptl/bits/thread-shared-types.h b/sysdeps/nptl/bits/thread-shared-types.h new file mode 100644 index 0000000000..1e2092a05d --- /dev/null +++ b/sysdeps/nptl/bits/thread-shared-types.h @@ -0,0 +1,178 @@ +/* Common threading primitives definitions for both POSIX and C11. + Copyright (C) 2017-2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#ifndef _THREAD_SHARED_TYPES_H +#define _THREAD_SHARED_TYPES_H 1 + +/* Arch-specific definitions. Each architecture must define the following + macros to define the expected sizes of pthread data types: + + __SIZEOF_PTHREAD_ATTR_T - size of pthread_attr_t. + __SIZEOF_PTHREAD_MUTEX_T - size of pthread_mutex_t. + __SIZEOF_PTHREAD_MUTEXATTR_T - size of pthread_mutexattr_t. + __SIZEOF_PTHREAD_COND_T - size of pthread_cond_t. + __SIZEOF_PTHREAD_CONDATTR_T - size of pthread_condattr_t. + __SIZEOF_PTHREAD_RWLOCK_T - size of pthread_rwlock_t. + __SIZEOF_PTHREAD_RWLOCKATTR_T - size of pthread_rwlockattr_t. + __SIZEOF_PTHREAD_BARRIER_T - size of pthread_barrier_t. + __SIZEOF_PTHREAD_BARRIERATTR_T - size of pthread_barrierattr_t. + + Also, the following macros must be define for internal pthread_mutex_t + struct definitions (struct __pthread_mutex_s): + + __PTHREAD_COMPAT_PADDING_MID - any additional members after 'kind' + and before '__spin' (for 64 bits) or + '__nusers' (for 32 bits). + __PTHREAD_COMPAT_PADDING_END - any additional members at the end of + 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: + + __LOCK_ALIGNMENT - for internal lock/futex usage. + + Same idea but for the once locking primitive: + + __ONCE_ALIGNMENT - for pthread_once_t/once_flag definition. + + And finally the internal pthread_rwlock_t (struct __pthread_rwlock_arch_t) + must be defined. + */ +#include <bits/pthreadtypes-arch.h> + +/* Common definition of pthread_mutex_t. */ + +#if !__PTHREAD_MUTEX_USE_UNION +typedef struct __pthread_internal_list +{ + struct __pthread_internal_list *__prev; + struct __pthread_internal_list *__next; +} __pthread_list_t; +#else +typedef struct __pthread_internal_slist +{ + struct __pthread_internal_slist *__next; +} __pthread_slist_t; +#endif + +/* Lock elision support. */ +#if __PTHREAD_MUTEX_LOCK_ELISION +# if !__PTHREAD_MUTEX_USE_UNION +# define __PTHREAD_SPINS_DATA \ + short __spins; \ + short __elision +# define __PTHREAD_SPINS 0, 0 +# else +# define __PTHREAD_SPINS_DATA \ + struct \ + { \ + short __espins; \ + short __eelision; \ + } __elision_data +# define __PTHREAD_SPINS { 0, 0 } +# define __spins __elision_data.__espins +# define __elision __elision_data.__eelision +# endif +#else +# define __PTHREAD_SPINS_DATA int __spins +/* Mutex __spins initializer used by PTHREAD_MUTEX_INITIALIZER. */ +# define __PTHREAD_SPINS 0 +#endif + +struct __pthread_mutex_s +{ + int __lock __LOCK_ALIGNMENT; + unsigned int __count; + int __owner; +#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 __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 + __extension__ union + { + __PTHREAD_SPINS_DATA; + __pthread_slist_t __list; + }; +# define __PTHREAD_MUTEX_HAVE_PREV 0 +#endif + __PTHREAD_COMPAT_PADDING_END +}; + + +/* Common definition of pthread_cond_t. */ + +struct __pthread_cond_s +{ + __extension__ union + { + __extension__ unsigned long long int __wseq; + struct + { + unsigned int __low; + unsigned int __high; + } __wseq32; + }; + __extension__ union + { + __extension__ unsigned long long int __g1_start; + struct + { + unsigned int __low; + unsigned int __high; + } __g1_start32; + }; + unsigned int __g_refs[2] __LOCK_ALIGNMENT; + unsigned int __g_size[2]; + unsigned int __g1_orig_size; + unsigned int __wrefs; + unsigned int __g_signals[2]; +}; + +#endif /* _THREAD_SHARED_TYPES_H */ |