diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h index 5751206dd9..8b460eb98f 100644 --- a/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h +++ b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h @@ -1,4 +1,4 @@ -/* Copyright (C) 2003 Free Software Foundation, Inc. +/* Copyright (C) 2003, 2004 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003. @@ -127,6 +127,20 @@ __lll_mutex_trylock (int *futex) #define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex)) +static inline int +__attribute__ ((always_inline)) +__lll_mutex_cond_trylock (int *futex) +{ + unsigned int old; + + __asm __volatile ("cs %0,%3,%1" + : "=d" (old), "=Q" (*futex) + : "0" (0), "d" (2), "m" (*futex) : "cc" ); + return old != 0; +} +#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex)) + + extern void __lll_lock_wait (int *futex) attribute_hidden; static inline void |