GRPC Core  43.0.0
atm_gcc_atomic.h
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1 /*
2  *
3  * Copyright 2015 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 #ifndef GRPC_SUPPORT_ATM_GCC_ATOMIC_H
20 #define GRPC_SUPPORT_ATM_GCC_ATOMIC_H
21 
22 // IWYU pragma: private, include <grpc/support/atm.h>
23 
24 /* atm_platform.h for gcc and gcc-like compilers with the
25  __atomic_* interface. */
27 
28 #ifdef __cplusplus
29 extern "C" {
30 #endif
31 
32 typedef intptr_t gpr_atm;
33 #define GPR_ATM_MAX INTPTR_MAX
34 #define GPR_ATM_MIN INTPTR_MIN
35 
36 #define gpr_atm_full_barrier() (__atomic_thread_fence(__ATOMIC_SEQ_CST))
37 
38 #define gpr_atm_acq_load(p) (__atomic_load_n((p), __ATOMIC_ACQUIRE))
39 #define gpr_atm_no_barrier_load(p) (__atomic_load_n((p), __ATOMIC_RELAXED))
40 #define gpr_atm_rel_store(p, value) \
41  (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELEASE))
42 #define gpr_atm_no_barrier_store(p, value) \
43  (__atomic_store_n((p), (intptr_t)(value), __ATOMIC_RELAXED))
44 
45 #define gpr_atm_no_barrier_fetch_add(p, delta) \
46  __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_RELAXED)
47 #define gpr_atm_full_fetch_add(p, delta) \
48  __atomic_fetch_add((p), (intptr_t)(delta), __ATOMIC_ACQ_REL)
49 
50 static __inline int gpr_atm_no_barrier_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
51  // Need to be c89 compatible, so we can't use false for the fourth argument.
52  // NOLINTNEXTLINE(modernize-use-bool-literals)
53  return __atomic_compare_exchange_n(p, &o, n, 0, __ATOMIC_RELAXED,
54  __ATOMIC_RELAXED);
55 }
56 
57 static __inline int gpr_atm_acq_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
58  // Need to be c89 compatible, so we can't use false for the fourth argument.
59  // NOLINTNEXTLINE(modernize-use-bool-literals)
60  return __atomic_compare_exchange_n(p, &o, n, 0, __ATOMIC_ACQUIRE,
61  __ATOMIC_RELAXED);
62 }
63 
64 static __inline int gpr_atm_rel_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
65  // Need to be c89 compatible, so we can't use false for the fourth argument.
66  // NOLINTNEXTLINE(modernize-use-bool-literals)
67  return __atomic_compare_exchange_n(p, &o, n, 0, __ATOMIC_RELEASE,
68  __ATOMIC_RELAXED);
69 }
70 
71 static __inline int gpr_atm_full_cas(gpr_atm* p, gpr_atm o, gpr_atm n) {
72  // Need to be c89 compatible, so we can't use false for the fourth argument.
73  // NOLINTNEXTLINE(modernize-use-bool-literals)
74  return __atomic_compare_exchange_n(p, &o, n, 0, __ATOMIC_ACQ_REL,
75  __ATOMIC_RELAXED);
76 }
77 
78 #define gpr_atm_full_xchg(p, n) __atomic_exchange_n((p), (n), __ATOMIC_ACQ_REL)
79 
80 #ifdef __cplusplus
81 }
82 #endif
83 
84 #endif /* GRPC_SUPPORT_ATM_GCC_ATOMIC_H */
gpr_atm_rel_cas
#define gpr_atm_rel_cas(p, o, n)
Definition: atm_gcc_sync.h:72
gpr_atm
intptr_t gpr_atm
Definition: atm_gcc_atomic.h:32
gpr_atm_no_barrier_cas
#define gpr_atm_no_barrier_cas(p, o, n)
Definition: atm_gcc_sync.h:70
gpr_atm_full_cas
#define gpr_atm_full_cas(p, o, n)
Definition: atm_gcc_sync.h:73
gpr_atm_acq_cas
#define gpr_atm_acq_cas(p, o, n)
Definition: atm_gcc_sync.h:71
port_platform.h