diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h | 282 |
1 files changed, 282 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h b/libpthread/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h new file mode 100644 index 000000000..f4ed98a50 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h @@ -0,0 +1,282 @@ +/* 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. + + 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#ifndef _LOWLEVELLOCK_H +#define _LOWLEVELLOCK_H 1 + +#include <time.h> +#include <sys/param.h> +#include <bits/pthreadtypes.h> +#include <atomic.h> + +#define SYS_futex 238 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 +#define FUTEX_REQUEUE 3 +#define FUTEX_CMP_REQUEUE 4 + +/* Initializer for compatibility lock. */ +#define LLL_MUTEX_LOCK_INITIALIZER (0) + +#define lll_futex_wait(futex, val) \ + ({ \ + register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \ + register unsigned long int __r3 asm ("3") = FUTEX_WAIT; \ + register unsigned long int __r4 asm ("4") = (unsigned long int) (val); \ + register unsigned long int __r5 asm ("5") = 0ul; \ + register unsigned long __result asm ("2"); \ + \ + __asm __volatile ("svc %b1" \ + : "=d" (__result) \ + : "i" (SYS_futex), "0" (__r2), "d" (__r3), \ + "d" (__r4), "d" (__r5) \ + : "cc", "memory" ); \ + __result; \ + }) + + +#define lll_futex_timed_wait(futex, val, timespec) \ + ({ \ + register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \ + register unsigned long int __r3 asm ("3") = FUTEX_WAIT; \ + register unsigned long int __r4 asm ("4") = (unsigned long int) (val); \ + register unsigned long int __r5 asm ("5") = (unsigned long int)(timespec);\ + register unsigned long int __result asm ("2"); \ + \ + __asm __volatile ("svc %b1" \ + : "=d" (__result) \ + : "i" (SYS_futex), "0" (__r2), "d" (__r3), \ + "d" (__r4), "d" (__r5) \ + : "cc", "memory" ); \ + __result; \ + }) + + +#define lll_futex_wake(futex, nr) \ + ({ \ + register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \ + register unsigned long int __r3 asm ("3") = FUTEX_WAKE; \ + register unsigned long int __r4 asm ("4") = (unsigned long int) (nr); \ + register unsigned long int __result asm ("2"); \ + \ + __asm __volatile ("svc %b1" \ + : "=d" (__result) \ + : "i" (SYS_futex), "0" (__r2), "d" (__r3), "d" (__r4) \ + : "cc", "memory" ); \ + __result; \ + }) + + +/* Returns non-zero if error happened, zero if success. */ +#define lll_futex_requeue(futex, nr_wake, nr_move, mutex, val) \ + ({ \ + register unsigned long int __r2 asm ("2") = (unsigned long int) (futex); \ + register unsigned long int __r3 asm ("3") = FUTEX_CMP_REQUEUE; \ + register unsigned long int __r4 asm ("4") = (long int) (nr_wake); \ + register unsigned long int __r5 asm ("5") = (long int) (nr_move); \ + register unsigned long int __r6 asm ("6") = (unsigned long int) (mutex); \ + register unsigned long int __r7 asm ("7") = (int) (val); \ + register unsigned long __result asm ("2"); \ + \ + __asm __volatile ("svc %b1" \ + : "=d" (__result) \ + : "i" (SYS_futex), "0" (__r2), "d" (__r3), \ + "d" (__r4), "d" (__r5), "d" (__r6), "d" (__r7) \ + : "cc", "memory" ); \ + __result > -4096UL; \ + }) + + +#define lll_compare_and_swap(futex, oldval, newval, operation) \ + do { \ + __typeof (futex) __futex = (futex); \ + __asm __volatile (" l %1,%0\n" \ + "0: " operation "\n" \ + " cs %1,%2,%0\n" \ + " jl 0b\n" \ + "1:" \ + : "=Q" (*__futex), "=&d" (oldval), "=&d" (newval) \ + : "m" (*__futex) : "cc", "memory" ); \ + } while (0) + + +static inline int +__attribute__ ((always_inline)) +__lll_mutex_trylock (int *futex) +{ + unsigned int old; + + __asm __volatile ("cs %0,%3,%1" + : "=d" (old), "=Q" (*futex) + : "0" (0), "d" (1), "m" (*futex) : "cc", "memory" ); + return old != 0; +} +#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", "memory" ); + 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 +__attribute__ ((always_inline)) +__lll_mutex_lock (int *futex) +{ + if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0) + __lll_lock_wait (futex); +} +#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex)) + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_cond_lock (int *futex) +{ + if (atomic_compare_and_exchange_bool_acq (futex, 2, 0) != 0) + __lll_lock_wait (futex); +} +#define lll_mutex_cond_lock(futex) __lll_mutex_cond_lock (&(futex)) + +extern int __lll_timedlock_wait + (int *futex, const struct timespec *) attribute_hidden; + +static inline int +__attribute__ ((always_inline)) +__lll_mutex_timedlock (int *futex, const struct timespec *abstime) +{ + int result = 0; + if (atomic_compare_and_exchange_bool_acq (futex, 1, 0) != 0) + result = __lll_timedlock_wait (futex, abstime); + return result; +} +#define lll_mutex_timedlock(futex, abstime) \ + __lll_mutex_timedlock (&(futex), abstime) + + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_unlock (int *futex) +{ + int oldval; + int newval = 0; + + lll_compare_and_swap (futex, oldval, newval, "slr %2,%2"); + if (oldval > 1) + lll_futex_wake (futex, 1); +} +#define lll_mutex_unlock(futex) \ + __lll_mutex_unlock(&(futex)) + + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_unlock_force (int *futex) +{ + *futex = 0; + lll_futex_wake (futex, 1); +} +#define lll_mutex_unlock_force(futex) \ + __lll_mutex_unlock_force(&(futex)) + +#define lll_mutex_islocked(futex) \ + (futex != 0) + + +/* We have a separate internal lock implementation which is not tied + to binary compatibility. We can use the lll_mutex_*. */ + +/* Type for lock object. */ +typedef int lll_lock_t; + +/* Initializers for lock. */ +#define LLL_LOCK_INITIALIZER (0) +#define LLL_LOCK_INITIALIZER_LOCKED (1) + +#define lll_trylock(futex) lll_mutex_trylock (futex) +#define lll_lock(futex) lll_mutex_lock (futex) +#define lll_unlock(futex) lll_mutex_unlock (futex) +#define lll_islocked(futex) lll_mutex_islocked (futex) + +extern int lll_unlock_wake_cb (int *__futex) attribute_hidden; + +/* The states of a lock are: + 1 - untaken + 0 - taken by one user + <0 - taken by more users */ + + +/* The kernel notifies a process with uses CLONE_CLEARTID via futex + wakeup when the clone terminates. The memory location contains the + thread ID while the clone is running and is reset to zero + afterwards. */ +static inline void +__attribute__ ((always_inline)) +__lll_wait_tid (int *ptid) +{ + int tid; + + while ((tid = *ptid) != 0) + lll_futex_wait (ptid, tid); +} +#define lll_wait_tid(tid) __lll_wait_tid(&(tid)) + +extern int __lll_timedwait_tid (int *, const struct timespec *) + attribute_hidden; + +#define lll_timedwait_tid(tid, abstime) \ + ({ \ + int __res = 0; \ + if ((tid) != 0) \ + __res = __lll_timedwait_tid (&(tid), (abstime)); \ + __res; \ + }) + +/* Conditional variable handling. */ + +extern void __lll_cond_wait (pthread_cond_t *cond) + attribute_hidden; +extern int __lll_cond_timedwait (pthread_cond_t *cond, + const struct timespec *abstime) + attribute_hidden; +extern void __lll_cond_wake (pthread_cond_t *cond) + attribute_hidden; +extern void __lll_cond_broadcast (pthread_cond_t *cond) + attribute_hidden; + +#define lll_cond_wait(cond) \ + __lll_cond_wait (cond) +#define lll_cond_timedwait(cond, abstime) \ + __lll_cond_timedwait (cond, abstime) +#define lll_cond_wake(cond) \ + __lll_cond_wake (cond) +#define lll_cond_broadcast(cond) \ + __lll_cond_broadcast (cond) + +#endif /* lowlevellock.h */ |