diff --git a/compat/atomics/dummy/stdatomic.h b/compat/atomics/dummy/stdatomic.h new file mode 100644 index 0000000000..374e1e5e17 --- /dev/null +++ b/compat/atomics/dummy/stdatomic.h @@ -0,0 +1,176 @@ +/* + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * based on vlc_atomic.h from VLC + * Copyright (C) 2010 Rémi Denis-Courmont + */ + +#ifndef LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H +#define LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H + +#include + +#define ATOMIC_FLAG_INIT 0 + +#define ATOMIC_VAR_INIT(value) (value) + +#define atomic_init(obj, value) \ +do { \ + *(obj) = (value); \ +} while(0) + +#define kill_dependency(y) ((void)0) + +#define atomic_thread_fence(order) \ + ((void)0) + +#define atomic_signal_fence(order) \ + ((void)0) + +#define atomic_is_lock_free(obj) 0 + +typedef intptr_t atomic_flag; +typedef intptr_t atomic_bool; +typedef intptr_t atomic_char; +typedef intptr_t atomic_schar; +typedef intptr_t atomic_uchar; +typedef intptr_t atomic_short; +typedef intptr_t atomic_ushort; +typedef intptr_t atomic_int; +typedef intptr_t atomic_uint; +typedef intptr_t atomic_long; +typedef intptr_t atomic_ulong; +typedef intptr_t atomic_llong; +typedef intptr_t atomic_ullong; +typedef intptr_t atomic_wchar_t; +typedef intptr_t atomic_int_least8_t; +typedef intptr_t atomic_uint_least8_t; +typedef intptr_t atomic_int_least16_t; +typedef intptr_t atomic_uint_least16_t; +typedef intptr_t atomic_int_least32_t; +typedef intptr_t atomic_uint_least32_t; +typedef intptr_t atomic_int_least64_t; +typedef intptr_t atomic_uint_least64_t; +typedef intptr_t atomic_int_fast8_t; +typedef intptr_t atomic_uint_fast8_t; +typedef intptr_t atomic_int_fast16_t; +typedef intptr_t atomic_uint_fast16_t; +typedef intptr_t atomic_int_fast32_t; +typedef intptr_t atomic_uint_fast32_t; +typedef intptr_t atomic_int_fast64_t; +typedef intptr_t atomic_uint_fast64_t; +typedef intptr_t atomic_intptr_t; +typedef intptr_t atomic_uintptr_t; +typedef intptr_t atomic_size_t; +typedef intptr_t atomic_ptrdiff_t; +typedef intptr_t atomic_intmax_t; +typedef intptr_t atomic_uintmax_t; + +#define atomic_store(object, desired) \ +do { \ + *(object) = (desired); \ +} while (0) + +#define atomic_store_explicit(object, desired, order) \ + atomic_store(object, desired) + +#define atomic_load(object) \ + (*(object)) + +#define atomic_load_explicit(object, order) \ + atomic_load(object) + +static inline intptr_t atomic_exchange(intptr_t *object, intptr_t desired) +{ + intptr_t ret = *object; + *object = desired; + return ret; +} + +#define atomic_exchange_explicit(object, desired, order) \ + atomic_exchange(object, desired) + +static inline int atomic_compare_exchange_strong(intptr_t *object, intptr_t *expected, + intptr_t desired) +{ + int ret; + if (*object == *expected) { + *object = desired; + ret = 1; + } else { + *expected = *object; + ret = 0; + } + return ret; +} + +#define atomic_compare_exchange_strong_explicit(object, expected, desired, success, failure) \ + atomic_compare_exchange_strong(object, expected, desired) + +#define atomic_compare_exchange_weak(object, expected, desired) \ + atomic_compare_exchange_strong(object, expected, desired) + +#define atomic_compare_exchange_weak_explicit(object, expected, desired, success, failure) \ + atomic_compare_exchange_weak(object, expected, desired) + +#define FETCH_MODIFY(opname, op) \ +static inline intptr_t atomic_fetch_ ## opname(intptr_t *object, intptr_t operand) \ +{ \ + intptr_t ret; \ + ret = *object; \ + *object = *object op operand; \ + return ret; \ +} + +FETCH_MODIFY(add, +) +FETCH_MODIFY(sub, -) +FETCH_MODIFY(or, |) +FETCH_MODIFY(xor, ^) +FETCH_MODIFY(and, &) + +#undef FETCH_MODIFY + +#define atomic_fetch_add_explicit(object, operand, order) \ + atomic_fetch_add(object, operand) + +#define atomic_fetch_sub_explicit(object, operand, order) \ + atomic_fetch_sub(object, operand) + +#define atomic_fetch_or_explicit(object, operand, order) \ + atomic_fetch_or(object, operand) + +#define atomic_fetch_xor_explicit(object, operand, order) \ + atomic_fetch_sub(object, operand) + +#define atomic_fetch_and_explicit(object, operand, order) \ + atomic_fetch_and(object, operand) + +#define atomic_flag_test_and_set(object) \ + atomic_exchange(object, 1) + +#define atomic_flag_test_and_set_explicit(object, order) \ + atomic_flag_test_and_set(object) + +#define atomic_flag_clear(object) \ + atomic_store(object, 0) + +#define atomic_flag_clear_explicit(object, order) \ + atomic_flag_clear(object) + +#endif /* LIBAV_COMPAT_ATOMICS_DUMMY_STDATOMIC_H */ diff --git a/configure b/configure index e61d12861d..7ac05cfada 100755 --- a/configure +++ b/configure @@ -5083,6 +5083,9 @@ if disabled stdatomic_h; then elif enabled pthreads; then add_compat atomics/pthread/stdatomic.o add_cppflags '-I\$(SRC_PATH)/compat/atomics/pthread' + else + enabled threads && die "Threading is enabled, but no atomics are available" + add_cppflags '-I\$(SRC_PATH)/compat/atomics/dummy' fi fi