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Diffstat (limited to 'atomic/impl/simpleops-atomic-impl-native.h')
-rw-r--r-- | atomic/impl/simpleops-atomic-impl-native.h | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/atomic/impl/simpleops-atomic-impl-native.h b/atomic/impl/simpleops-atomic-impl-native.h new file mode 100644 index 0000000..4c58e72 --- /dev/null +++ b/atomic/impl/simpleops-atomic-impl-native.h @@ -0,0 +1,147 @@ +/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */ +/* + * Copyright 2007 Chris Wilson + * Copyright 2010-2011 Andrea Canciani + * + * Permission is hereby granted, free of charge, to any person + * obtaining a copy of this software and associated documentation + * files (the "Software"), to deal in the Software without + * restriction, including without limitation the rights to use, copy, + * modify, merge, publish, distribute, sublicense, and/or sell copies + * of the Software, and to permit persons to whom the Software is + * furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + * Author(s): Andrea Canciani <ranma42@gmail.com> + * Chris Wilson <chris@chris-wilson.co.uk> + */ + +#ifndef SIMPLEOPS_ATOMIC_IMPL_NATIVE_H +#define SIMPLEOPS_ATOMIC_IMPL_NATIVE_H + +#ifndef SIMPLEOPS_ATOMIC_IMPL_H +#error Private header used directly +#endif + +#if ! SIMPLEOPS_HAVE_ATOMIC_IMPL && \ + SIMPLEOPS_HAVE_NATIVE_ATOMIC_PRIMITIVES + +#define SIMPLEOPS_HAVE_ATOMIC_IMPL 1 +#define SIMPLEOPS_HAVE_ATOMIC_IMPL_NATIVE 1 + +static simpleops_always_inline void _simpleops_atomic_barrier (void) +{ +#if SIMPLEOPS_ATOMIC_IMPL_NEEDS_MEMORY_BARRIER + __sync_synchronize (); +#endif +} + +/* Atomic integer functions */ +typedef int simpleops_atomic_int_t; + +static simpleops_always_inline simpleops_bool_t +simpleops_atomic_int_compare_exchange (simpleops_atomic_int_t volatile *x, + simpleops_atomic_int_t oldv, + simpleops_atomic_int_t newv) +{ + return __sync_bool_compare_and_swap (x, oldv, newv); +} + +static simpleops_always_inline simpleops_atomic_int_t +simpleops_atomic_int_exchange (simpleops_atomic_int_t volatile *x, + simpleops_atomic_int_t newv) +{ +#if SIMPLEOPS_HAVE_NATIVE_ATOMIC_SWAP + return __sync_swap (x, newv); +#else + simpleops_atomic_int_t r; + + _simpleops_atomic_barrier (); + + do { + r = *x; + } while (! simpleops_atomic_int_compare_exchange (x, r, newv)); + + return r; +#endif +} + +static simpleops_always_inline simpleops_atomic_int_t +simpleops_atomic_int_load (simpleops_atomic_int_t const volatile *x) +{ + _simpleops_atomic_barrier (); + return *x; +} + +static simpleops_always_inline void +simpleops_atomic_int_store (simpleops_atomic_int_t volatile *x, + simpleops_atomic_int_t newv) +{ + _simpleops_atomic_barrier (); + *x = newv; +} + +static simpleops_always_inline simpleops_atomic_int_t +simpleops_atomic_int_fetch_add (simpleops_atomic_int_t volatile *x, + simpleops_atomic_int_t y) +{ + return __sync_fetch_and_add (x, y); +} + +/* Atomic pointer functions */ +static simpleops_always_inline simpleops_bool_t +simpleops_atomic_ptr_compare_exchange (void * volatile *x, + void * const oldv, + void * const newv) +{ + return __sync_bool_compare_and_swap (x, oldv, newv); +} + +static simpleops_always_inline void * +simpleops_atomic_ptr_exchange (void * volatile *x, + void * const newv) +{ +#if SIMPLEOPS_HAVE_SYNC_SWAP + return __sync_swap (x, newv); +#else + void *r; + + _simpleops_atomic_barrier (); + + do { + r = *x; + } while (! simpleops_atomic_ptr_compare_exchange (x, r, newv)); + + return r; +#endif +} + +static simpleops_always_inline void * +simpleops_atomic_ptr_load (void * const volatile *x) +{ + _simpleops_atomic_barrier (); + return *x; +} + +static simpleops_always_inline void +simpleops_atomic_ptr_store (void * volatile *x, + void * const newv) +{ + _simpleops_atomic_barrier (); + *x = newv; +} + +#endif + +#endif |