95 lines
3.8 KiB
C
95 lines
3.8 KiB
C
/*
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* Copyright(c) 2006 to 2019 ZettaScale Technology and others
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v. 2.0 which is available at
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* http://www.eclipse.org/legal/epl-2.0, or the Eclipse Distribution License
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* v. 1.0 which is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
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*/
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#ifndef DDSRT_ATOMICS_H
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#define DDSRT_ATOMICS_H
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#include <stddef.h>
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#include "dds/export.h"
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#include "dds/ddsrt/arch.h"
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#include "dds/ddsrt/endian.h"
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#include "dds/ddsrt/types.h"
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#if defined (__cplusplus)
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extern "C" {
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#endif
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/**
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* @brief Types on which atomic operations are defined.
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*
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* @note 64-bit types are defined even if atomic operations on them are not
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* really supported. atomic
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*/
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typedef struct { uint32_t v; } ddsrt_atomic_uint32_t;
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typedef struct { uint64_t v; } ddsrt_atomic_uint64_t;
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typedef struct { uintptr_t v; } ddsrt_atomic_uintptr_t;
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typedef ddsrt_atomic_uintptr_t ddsrt_atomic_voidp_t;
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#if DDSRT_64BIT
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# define DDSRT_HAVE_ATOMIC64 1
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#endif
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/**
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* @brief Initializers for the types on which atomic operations are defined.
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*/
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#define DDSRT_ATOMIC_UINT32_INIT(v) { (v) }
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#define DDSRT_ATOMIC_UINT64_INIT(v) { (v) }
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#define DDSRT_ATOMIC_UINTPTR_INIT(v) { (v) }
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#define DDSRT_ATOMIC_VOIDP_INIT(v) { (uintptr_t) (v) }
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#if (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) >= 40100
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#include "dds/ddsrt/atomics/gcc.h"
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#elif defined(_WIN32)
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#include "dds/ddsrt/atomics/msvc.h"
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#elif defined(__sun)
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#include "dds/ddsrt/atomics/sun.h"
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#elif defined(__IAR_SYSTEMS_ICC__) && defined(__ICCARM__)
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#include "dds/ddsrt/atomics/arm.h"
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#else
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#error "Atomic operations are not supported"
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#endif
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#if ! DDSRT_HAVE_ATOMIC64
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/* 64-bit atomics are not supported by all hardware, but it would be a shame not to use them when
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they are available. That necessitates an alternative implementation when they are not, either in
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the form of a different implementation where it is used, or as an emulation using a mutex in
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ddsrt. It seems that the places where they'd be used end up adding a mutex, so an emulation in
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ddsrt while being able to check whether it is supported by hardware is a sensible approach. */
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DDS_EXPORT uint64_t ddsrt_atomic_ld64 (const volatile ddsrt_atomic_uint64_t *x);
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DDS_EXPORT void ddsrt_atomic_st64 (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT void ddsrt_atomic_inc64 (volatile ddsrt_atomic_uint64_t *x);
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DDS_EXPORT uint64_t ddsrt_atomic_inc64_nv (volatile ddsrt_atomic_uint64_t *x);
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DDS_EXPORT void ddsrt_atomic_dec64 (volatile ddsrt_atomic_uint64_t *x);
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DDS_EXPORT uint64_t ddsrt_atomic_dec64_nv (volatile ddsrt_atomic_uint64_t *x);
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DDS_EXPORT void ddsrt_atomic_add64 (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_add64_nv (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT void ddsrt_atomic_sub64 (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_sub64_nv (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT void ddsrt_atomic_and64 (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_and64_ov (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_and64_nv (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT void ddsrt_atomic_or64 (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_or64_ov (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT uint64_t ddsrt_atomic_or64_nv (volatile ddsrt_atomic_uint64_t *x, uint64_t v);
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DDS_EXPORT int ddsrt_atomic_cas64 (volatile ddsrt_atomic_uint64_t *x, uint64_t exp, uint64_t des);
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#endif
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void ddsrt_atomics_init (void);
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void ddsrt_atomics_fini (void);
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#if defined(__cplusplus)
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}
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#endif
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#endif /* DDSRT_ATOMICS_H */
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