diff options
Diffstat (limited to 'include/grpc/impl/codegen/atm_gcc_sync.h')
-rw-r--r-- | include/grpc/impl/codegen/atm_gcc_sync.h | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/include/grpc/impl/codegen/atm_gcc_sync.h b/include/grpc/impl/codegen/atm_gcc_sync.h new file mode 100644 index 0000000000..56f755949d --- /dev/null +++ b/include/grpc/impl/codegen/atm_gcc_sync.h @@ -0,0 +1,87 @@ +/* + * + * Copyright 2015-2016, 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_SYNC_H +#define GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H + +/* variant of atm_platform.h for gcc and gcc-like compiers with __sync_* + interface */ +#include <grpc/impl/codegen/port_platform.h> + +typedef intptr_t 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_IMPL_CODEGEN_ATM_GCC_SYNC_H */ |