diff options
author | Ulrich Drepper <drepper@redhat.com> | 2003-02-05 09:54:24 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 2003-02-05 09:54:24 +0000 |
commit | a88c9263686012ca2a336379b7d66e59dea2b43b (patch) | |
tree | f83540ebdedecb23aa76a4e84e2e5c370bf9809d /nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h | |
parent | ec609a8e77b592e5f8ef95fd2c1d44015a45d063 (diff) |
Update.
2003-02-05 Ulrich Drepper <drepper@redhat.com>
* sysdeps/pthread/bits/libc-lock.h (__libc_once): Set control
variable for non-libpthread case to the same value the
pthread_once function would use.
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h')
-rw-r--r-- | nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h new file mode 100644 index 0000000000..13cfbd6bd2 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/s390/lowlevellock.h @@ -0,0 +1,294 @@ +/* Copyright (C) 2003 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> + +#define SYS_futex 238 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +/* 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; \ + }) + + +#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" ); \ + } 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" ); + return old != 0; +} +#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex)) + + +extern void ___lll_mutex_lock (int *, int) attribute_hidden; + + +static inline void +__attribute__ ((always_inline)) +__lll_mutex_lock (int *futex) +{ + int oldval; + int newval; + + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1"); + if (oldval > 0) + ___lll_mutex_lock (futex, newval); +} +#define lll_mutex_lock(futex) __lll_mutex_lock (&(futex)) + + +extern int ___lll_mutex_timedlock (int *, const struct timespec *, int) + attribute_hidden; + + +static inline int +__attribute__ ((always_inline)) +__lll_mutex_timedlock (int *futex, struct timespec *abstime) +{ + int oldval; + int newval; + int result = 0; + + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,1"); + if (oldval > 0) + result = ___lll_mutex_timedlock (futex, abstime, newval); + + 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; + + 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)) + +#define lll_mutex_islocked(futex) \ + (futex != 0) + + +/* We have a separate internal lock implementation which is not tied + to binary compatibility. */ + +/* Type for lock object. */ +typedef int lll_lock_t; + +/* Initializers for lock. */ +#define LLL_LOCK_INITIALIZER (1) +#define LLL_LOCK_INITIALIZER_LOCKED (0) + + +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 */ + + +static inline int +__attribute__ ((always_inline)) +__lll_trylock (int *futex) +{ + unsigned int old; + + __asm __volatile ("cs %0,%3,%1" + : "=d" (old), "=Q" (*futex) + : "0" (1), "d" (0), "m" (*futex) : "cc" ); + return old != 1; +} +#define lll_trylock(futex) __lll_trylock (&(futex)) + + +extern void ___lll_lock (int *, int) attribute_hidden; + +static inline void +__attribute__ ((always_inline)) +__lll_lock (int *futex) +{ + int oldval; + int newval; + + lll_compare_and_swap (futex, oldval, newval, "lr %2,%1; ahi %2,-1"); + if (newval < 0) + ___lll_lock (futex, newval); +} +#define lll_lock(futex) __lll_lock (&(futex)) + + +static inline void +__attribute__ ((always_inline)) +__lll_unlock (int *futex) +{ + int oldval; + int newval; + + lll_compare_and_swap (futex, oldval, newval, "lhi %2,1"); + if (oldval < 0) + lll_futex_wake (futex, 1); +} +#define lll_unlock(futex) __lll_unlock(&(futex)) + + +#define lll_islocked(futex) \ + (futex != 1) + + +/* 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; +static inline int +__attribute__ ((always_inline)) +__lll_timedwait_tid (int *ptid, const struct timespec *abstime) +{ + if (*ptid == 0) + return 0; + + return ___lll_timedwait_tid (ptid, abstime); +} +#define lll_timedwait_tid(tid, abstime) __lll_timedwait_tid (&(tid), abstime) + + +static inline void +__attribute__ ((always_inline)) +__lll_wake_tid (int *ptid) +{ + *ptid = 0; + lll_futex_wake (ptid, INT_MAX); +} +#define lll_wake_tid(tid) __lll_wake_tid (&(tid)) + + +/* 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 */ |