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/*
*
* Copyright 2015, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef GRPC_SUPPORT_ATM_GCC_SYNC_H
#define GRPC_SUPPORT_ATM_GCC_SYNC_H
/* variant of atm_platform.h for gcc and gcc-like compiers with __sync_*
interface */
#include <grpc/support/port_platform.h>
typedef gpr_intptr gpr_atm;
#define GPR_ATM_COMPILE_BARRIER_() __asm__ __volatile__("" : : : "memory")
#if defined(__i386) || defined(__x86_64__)
/* All loads are acquire loads and all stores are release stores. */
#define GPR_ATM_LS_BARRIER_() GPR_ATM_COMPILE_BARRIER_()
#else
#define GPR_ATM_LS_BARRIER_() gpr_atm_full_barrier()
#endif
#define gpr_atm_full_barrier() (__sync_synchronize())
static __inline gpr_atm gpr_atm_acq_load(const gpr_atm *p) {
gpr_atm value = *p;
GPR_ATM_LS_BARRIER_();
return value;
}
static __inline gpr_atm gpr_atm_no_barrier_load(const gpr_atm *p) {
gpr_atm value = *p;
GPR_ATM_COMPILE_BARRIER_();
return value;
}
static __inline void gpr_atm_rel_store(gpr_atm *p, gpr_atm value) {
GPR_ATM_LS_BARRIER_();
*p = value;
}
static __inline void gpr_atm_no_barrier_store(gpr_atm *p, gpr_atm value) {
GPR_ATM_COMPILE_BARRIER_();
*p = value;
}
#undef GPR_ATM_LS_BARRIER_
#undef GPR_ATM_COMPILE_BARRIER_
#define gpr_atm_no_barrier_fetch_add(p, delta) \
gpr_atm_full_fetch_add((p), (delta))
#define gpr_atm_full_fetch_add(p, delta) (__sync_fetch_and_add((p), (delta)))
#define gpr_atm_no_barrier_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
#define gpr_atm_acq_cas(p, o, n) (__sync_bool_compare_and_swap((p), (o), (n)))
#define gpr_atm_rel_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
#endif /* GRPC_SUPPORT_ATM_GCC_SYNC_H */
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