diff options
author | Waldemar Brodkorb <wbx@openadk.org> | 2016-05-31 20:51:29 +0200 |
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committer | Waldemar Brodkorb <wbx@openadk.org> | 2016-05-31 20:51:29 +0200 |
commit | 3ac3d4e61a1de0c2d0e0d2bebf0d1b111f153f12 (patch) | |
tree | 1f4937d22617218f5ebd2a0e26441fcd3a44db49 /libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c | |
parent | 95174cb69c523a1544e5f6f20e47f7d60007e569 (diff) |
arm: add non-assembly versions of pthread_spin_lock/pthread_spin_trylock
Sync pthread_spin_lock/pthread_spin_trylock with GNU libc as it avoids
any usage of deprecated SWP instruction. This allows to build uClibc-ng
for ARMv8 Cortex-A53 CPU in 32 Bit mode.
Diffstat (limited to 'libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c')
-rw-r--r-- | libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c b/libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c new file mode 100644 index 000000000..4e1a96c03 --- /dev/null +++ b/libpthread/nptl/sysdeps/arm/pthread_spin_trylock.c @@ -0,0 +1,27 @@ +/* pthread_spin_trylock -- trylock a spin lock. Generic version. + Copyright (C) 2012-2016 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 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, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <atomic.h> +#include "pthreadP.h" + +int +pthread_spin_trylock (pthread_spinlock_t *lock) +{ + return atomic_exchange_acq (lock, 1) ? EBUSY : 0; +} |