diff options
Diffstat (limited to 'linuxthreads/sysdeps/pthread/bits')
| -rw-r--r-- | linuxthreads/sysdeps/pthread/bits/initspin.h | 28 | ||||
| -rw-r--r-- | linuxthreads/sysdeps/pthread/bits/libc-lock.h | 23 |
2 files changed, 44 insertions, 7 deletions
diff --git a/linuxthreads/sysdeps/pthread/bits/initspin.h b/linuxthreads/sysdeps/pthread/bits/initspin.h new file mode 100644 index 0000000000..050983c4c1 --- /dev/null +++ b/linuxthreads/sysdeps/pthread/bits/initspin.h @@ -0,0 +1,28 @@ +/* Generic definitions for spinlock initializers. + Copyright (C) 2000 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 Library General Public License as + published by the Free Software Foundation; either version 2 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +/* Initial value of a spinlock. Most platforms should use zero, + unless they only implement a "test and clear" operation instead of + the usual "test and set". */ +#define LT_SPINLOCK_INIT 0 + +/* Macros for lock initializers, using the above definition. */ +#define LOCK_INITIALIZER { 0, LT_SPINLOCK_INIT } +#define ALT_LOCK_INITIALIZER { 0, LT_SPINLOCK_INIT } +#define ATOMIC_INITIALIZER { 0, LT_SPINLOCK_INIT } diff --git a/linuxthreads/sysdeps/pthread/bits/libc-lock.h b/linuxthreads/sysdeps/pthread/bits/libc-lock.h index d0e9a8d9b4..41bca4de3f 100644 --- a/linuxthreads/sysdeps/pthread/bits/libc-lock.h +++ b/linuxthreads/sysdeps/pthread/bits/libc-lock.h @@ -48,12 +48,21 @@ typedef pthread_key_t __libc_key_t; /* Define an initialized lock variable NAME with storage class CLASS. - For the C library we take a deeper look at the initializer. For this - implementation all fields are initialized to zero. Therefore we - don't initialize the variable which allows putting it into the BSS - section. */ -#define __libc_lock_define_initialized(CLASS,NAME) \ + For the C library we take a deeper look at the initializer. For + this implementation all fields are initialized to zero. Therefore + we don't initialize the variable which allows putting it into the + BSS section. (Except on PA-RISC and other odd architectures, where + initialized locks must be set to one due to the lack of normal + atomic operations.) */ + +#if LT_SPINLOCK_INIT == 0 +# define __libc_lock_define_initialized(CLASS,NAME) \ CLASS __libc_lock_t NAME; +#else +# define __libc_lock_define_initialized(CLASS,NAME) \ + CLASS __libc_lock_t NAME = PTHREAD_MUTEX_INITIALIZER; +#endif + #define __libc_rwlock_define_initialized(CLASS,NAME) \ CLASS __libc_rwlock_t NAME = PTHREAD_RWLOCK_INITIALIZER; @@ -143,9 +152,9 @@ typedef pthread_key_t __libc_key_t; do { \ if (__pthread_once != NULL) \ __pthread_once (&(ONCE_CONTROL), (INIT_FUNCTION)); \ - else if ((ONCE_CONTROL) == 0) { \ + else if ((ONCE_CONTROL) == PTHREAD_ONCE_INIT) { \ INIT_FUNCTION (); \ - (ONCE_CONTROL) = 1; \ + (ONCE_CONTROL) = !PTHREAD_ONCE_INIT; \ } \ } while (0) |