| 1 | /* Copyright (C) 2003-2024 Free Software Foundation, Inc. |
|---|
| 2 | This file is part of the GNU C Library. |
|---|
| 3 | |
|---|
| 4 | The GNU C Library is free software; you can redistribute it and/or |
|---|
| 5 | modify it under the terms of the GNU Lesser General Public |
|---|
| 6 | License as published by the Free Software Foundation; either |
|---|
| 7 | version 2.1 of the License, or (at your option) any later version. |
|---|
| 8 | |
|---|
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
|---|
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|---|
| 12 | Lesser General Public License for more details. |
|---|
| 13 | |
|---|
| 14 | You should have received a copy of the GNU Lesser General Public |
|---|
| 15 | License along with the GNU C Library; if not, see |
|---|
| 16 | <https://www.gnu.org/licenses/>. */ |
|---|
| 17 | |
|---|
| 18 | #include <errno.h> |
|---|
| 19 | #include "pthreadP.h" |
|---|
| 20 | #include <shlib-compat.h> |
|---|
| 21 | |
|---|
| 22 | int |
|---|
| 23 | __pthread_spin_trylock (pthread_spinlock_t *lock) |
|---|
| 24 | { |
|---|
| 25 | unsigned int old; |
|---|
| 26 | int err = EBUSY; |
|---|
| 27 | |
|---|
| 28 | asm ("1: lwarx %0,0,%2" MUTEX_HINT_ACQ "\n" |
|---|
| 29 | " cmpwi 0,%0,0\n" |
|---|
| 30 | " bne 2f\n" |
|---|
| 31 | " stwcx. %3,0,%2\n" |
|---|
| 32 | " bne- 1b\n" |
|---|
| 33 | " li %1,0\n" |
|---|
| 34 | __ARCH_ACQ_INSTR "\n" |
|---|
| 35 | "2: " |
|---|
| 36 | : "=&r" (old), "=&r" (err) |
|---|
| 37 | : "r" (lock), "r" (1), "1" (err) |
|---|
| 38 | : "cr0" , "memory" ); |
|---|
| 39 | |
|---|
| 40 | return err; |
|---|
| 41 | } |
|---|
| 42 | versioned_symbol (libc, __pthread_spin_trylock, pthread_spin_trylock, |
|---|
| 43 | GLIBC_2_34); |
|---|
| 44 | |
|---|
| 45 | #if OTHER_SHLIB_COMPAT (libpthread, GLIBC_2_2, GLIBC_2_34) |
|---|
| 46 | compat_symbol (libpthread, __pthread_spin_trylock, pthread_spin_trylock, |
|---|
| 47 | GLIBC_2_2); |
|---|
| 48 | #endif |
|---|
| 49 | |
|---|
