| /* |
| * |
| * 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; |
| } |
| |
| #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 */ |