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atm_gcc_sync.h
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1 /*
2 *
3 * Copyright 2015, Google Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following disclaimer
14 * in the documentation and/or other materials provided with the
15 * distribution.
16 * * Neither the name of Google Inc. nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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24 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
25 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
26 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
30 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 */
33
34 #ifndef GRPC_SUPPORT_ATM_GCC_SYNC_H
35 #define GRPC_SUPPORT_ATM_GCC_SYNC_H
36
37 /* variant of atm_platform.h for gcc and gcc-like compiers with __sync_*
38 interface */
39 #include <grpc/support/port_platform.h>
40
41 typedef gpr_intptr gpr_atm;
42
43 #define GPR_ATM_COMPILE_BARRIER_() __asm__ __volatile__("" : : : "memory")
44
45 #if defined(__i386) || defined(__x86_64__)
46 /* All loads are acquire loads and all stores are release stores. */
47 #define GPR_ATM_LS_BARRIER_() GPR_ATM_COMPILE_BARRIER_()
48 #else
49 #define GPR_ATM_LS_BARRIER_() gpr_atm_full_barrier()
50 #endif
51
52 #define gpr_atm_full_barrier() (__sync_synchronize())
53
54 static __inline gpr_atm gpr_atm_acq_load(const gpr_atm *p) {
55 gpr_atm value = *p;
56 GPR_ATM_LS_BARRIER_();
57 return value;
58 }
59
60 static __inline gpr_atm gpr_atm_no_barrier_load(const gpr_atm *p) {
61 gpr_atm value = *p;
62 GPR_ATM_COMPILE_BARRIER_();
63 return value;
64 }
65
66 static __inline void gpr_atm_rel_store(gpr_atm *p, gpr_atm value) {
67 GPR_ATM_LS_BARRIER_();
68 *p = value;
69 }
70
71 static __inline void gpr_atm_no_barrier_store(gpr_atm *p, gpr_atm value) {
72 GPR_ATM_COMPILE_BARRIER_();
73 *p = value;
74 }
75
76 #undef GPR_ATM_LS_BARRIER_
77 #undef GPR_ATM_COMPILE_BARRIER_
78
79 #define gpr_atm_no_barrier_fetch_add(p, delta) \
80 gpr_atm_full_fetch_add((p), (delta))
81 #define gpr_atm_full_fetch_add(p, delta) (__sync_fetch_and_add((p), (delta)))
82
83 #define gpr_atm_no_barrier_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
84 #define gpr_atm_acq_cas(p, o, n) (__sync_bool_compare_and_swap((p), (o), (n)))
85 #define gpr_atm_rel_cas(p, o, n) gpr_atm_acq_cas((p), (o), (n))
86
87 #endif /* GRPC_SUPPORT_ATM_GCC_SYNC_H */
port_platform.h
gpr_intptr
intptr_t gpr_intptr
Definition: port_platform.h:312
GPR_ATM_LS_BARRIER_
#define GPR_ATM_LS_BARRIER_()
Definition: atm_gcc_sync.h:49
GPR_ATM_COMPILE_BARRIER_
#define GPR_ATM_COMPILE_BARRIER_()
Definition: atm_gcc_sync.h:43
gpr_atm_acq_load
#define gpr_atm_acq_load(p)
Definition: atm_gcc_atomic.h:45
gpr_atm_no_barrier_load
#define gpr_atm_no_barrier_load(p)
Definition: atm_gcc_atomic.h:46
gpr_atm
gpr_intptr gpr_atm
Definition: atm_gcc_sync.h:41
gpr_atm_no_barrier_store
#define gpr_atm_no_barrier_store(p, value)
Definition: atm_gcc_atomic.h:49
gpr_atm_rel_store
#define gpr_atm_rel_store(p, value)
Definition: atm_gcc_atomic.h:47
gpr_atm
gpr_intptr gpr_atm
Definition: atm_gcc_atomic.h:41