GRPC Core  10.0.0
atm_gcc_sync.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_IMPL_CODEGEN_ATM_GCC_SYNC_H
20 #define GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H
21 
22 /* variant of atm_platform.h for gcc and gcc-like compiers with __sync_*
23  interface */
25 
26 typedef intptr_t gpr_atm;
27 #define GPR_ATM_MAX INTPTR_MAX
28 #define GPR_ATM_MIN INTPTR_MIN
29 #define GPR_ATM_INC_CAS_THEN(blah) blah
30 #define GPR_ATM_INC_ADD_THEN(blah) blah
31 
32 #define GPR_ATM_COMPILE_BARRIER_() __asm__ __volatile__("" : : : "memory")
33 
34 #if defined(__i386) || defined(__x86_64__)
35 /* All loads are acquire loads and all stores are release stores. */
36 #define GPR_ATM_LS_BARRIER_() GPR_ATM_COMPILE_BARRIER_()
37 #else
38 #define GPR_ATM_LS_BARRIER_() gpr_atm_full_barrier()
39 #endif
40 
41 #define gpr_atm_full_barrier() (__sync_synchronize())
42 
43 static __inline gpr_atm gpr_atm_acq_load(const gpr_atm* p) {
44  gpr_atm value = *p;
46  return value;
47 }
48 
49 static __inline gpr_atm gpr_atm_no_barrier_load(const gpr_atm* p) {
50  gpr_atm value = *p;
52  return value;
53 }
54 
55 static __inline void gpr_atm_rel_store(gpr_atm* p, gpr_atm value) {
57  *p = value;
58 }
59 
60 static __inline void gpr_atm_no_barrier_store(gpr_atm* p, gpr_atm value) {
62  *p = value;
63 }
64 
65 #undef GPR_ATM_LS_BARRIER_
66 #undef GPR_ATM_COMPILE_BARRIER_
67 
68 #define gpr_atm_no_barrier_fetch_add(p, delta) \
69  gpr_atm_full_fetch_add((p), (delta))
70 #define gpr_atm_full_fetch_add(p, delta) (__sync_fetch_and_add((p), (delta)))
71 
72 #define gpr_atm_no_barrier_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
73 #define gpr_atm_acq_cas(p, o, n) (__sync_bool_compare_and_swap((p), (o), (n)))
74 #define gpr_atm_rel_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
75 #define gpr_atm_full_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
76 
77 static __inline gpr_atm gpr_atm_full_xchg(gpr_atm* p, gpr_atm n) {
78  gpr_atm cur;
79  do {
80  cur = gpr_atm_acq_load(p);
81  } while (!gpr_atm_rel_cas(p, cur, n));
82  return cur;
83 }
84 
85 #endif /* GRPC_IMPL_CODEGEN_ATM_GCC_SYNC_H */
GPR_ATM_COMPILE_BARRIER_
#define GPR_ATM_COMPILE_BARRIER_()
Definition: atm_gcc_sync.h:32
gpr_atm_no_barrier_load
#define gpr_atm_no_barrier_load(p)
Definition: atm_gcc_atomic.h:51
gpr_atm_no_barrier_store
#define gpr_atm_no_barrier_store(p, value)
Definition: atm_gcc_atomic.h:54
GPR_ATM_LS_BARRIER_
#define GPR_ATM_LS_BARRIER_()
Definition: atm_gcc_sync.h:38
gpr_atm_full_xchg
#define gpr_atm_full_xchg(p, n)
Definition: atm_gcc_atomic.h:84
gpr_atm_rel_cas
#define gpr_atm_rel_cas(p, o, n)
Definition: atm_gcc_sync.h:74
gpr_atm
intptr_t gpr_atm
Definition: atm_gcc_sync.h:26
gpr_atm_acq_load
#define gpr_atm_acq_load(p)
Definition: atm_gcc_atomic.h:50
gpr_atm_rel_store
#define gpr_atm_rel_store(p, value)
Definition: atm_gcc_atomic.h:52
gpr_atm
intptr_t gpr_atm
Definition: atm_gcc_atomic.h:30
port_platform.h