| /* |
| * |
| * 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_IMPL_CODEGEN_ATM_GCC_ATOMIC_H |
| #define GRPC_IMPL_CODEGEN_ATM_GCC_ATOMIC_H |
| |
| /* atm_platform.h for gcc and gcc-like compilers with the |
| __atomic_* interface. */ |
| #include <grpc/impl/codegen/port_platform.h> |
| |
| typedef intptr_t gpr_atm; |
| |
| #ifdef GPR_LOW_LEVEL_COUNTERS |
| extern gpr_atm gpr_counter_atm_cas; |
| extern gpr_atm gpr_counter_atm_add; |
| #define GPR_ATM_INC_COUNTER(counter) \ |
| __atomic_fetch_add(&counter, 1, __ATOMIC_RELAXED) |
| #define GPR_ATM_INC_CAS_THEN(blah) \ |
| (GPR_ATM_INC_COUNTER(gpr_counter_atm_cas), blah) |
| #define GPR_ATM_INC_ADD_THEN(blah) \ |
| (GPR_ATM_INC_COUNTER(gpr_counter_atm_add), blah) |
| #else |
| #define GPR_ATM_INC_CAS_THEN(blah) blah |
| #define GPR_ATM_INC_ADD_THEN(blah) blah |
| #endif |
| |
| #define gpr_atm_full_barrier() (__atomic_thread_fence(__ATOMIC_SEQ_CST)) |
| |
| #define gpr_atm_acq_load(p) (__atomic_load_n((p), __ATOMIC_ACQUIRE)) |
| #define gpr_atm_no_barrier_load(p) (__atomic_load_n((p), __ATOMIC_RELAXED)) |
| #define gpr_atm_rel_store(p, value) \ |
| (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELEASE)) |
| #define gpr_atm_no_barrier_store(p, value) \ |
| (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELAXED)) |
| |
| #define gpr_atm_no_barrier_fetch_add(p, delta) \ |
| GPR_ATM_INC_ADD_THEN( \ |
| __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_RELAXED)) |
| #define gpr_atm_full_fetch_add(p, delta) \ |
| GPR_ATM_INC_ADD_THEN( \ |
| __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_ACQ_REL)) |
| |
| static __inline int gpr_atm_no_barrier_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_RELAXED, __ATOMIC_RELAXED)); |
| } |
| |
| static __inline int gpr_atm_acq_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_ACQUIRE, __ATOMIC_RELAXED)); |
| } |
| |
| static __inline int gpr_atm_rel_cas(gpr_atm *p, gpr_atm o, gpr_atm n) { |
| return GPR_ATM_INC_CAS_THEN(__atomic_compare_exchange_n( |
| p, &o, n, 0, __ATOMIC_RELEASE, __ATOMIC_RELAXED)); |
| } |
| |
| #define gpr_atm_full_xchg(p, n) \ |
| GPR_ATM_INC_CAS_THEN(__atomic_exchange_n((p), (n), __ATOMIC_ACQ_REL)) |
| |
| #endif /* GRPC_IMPL_CODEGEN_ATM_GCC_ATOMIC_H */ |