1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/*
*
* 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.
*
*/
#include "src/core/client_config/lb_policy.h"
#define WEAK_REF_BITS 16
void grpc_lb_policy_init(grpc_lb_policy *policy,
const grpc_lb_policy_vtable *vtable) {
policy->vtable = vtable;
gpr_atm_no_barrier_store(&policy->ref_pair, 1 << WEAK_REF_BITS);
policy->interested_parties = grpc_pollset_set_create();
}
#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
#define REF_FUNC_EXTRA_ARGS , const char *file, int line, const char *reason
#define REF_MUTATE_EXTRA_ARGS REF_FUNC_EXTRA_ARGS, const char *purpose
#define REF_FUNC_PASS_ARGS(new_reason) , file, line, new_reason
#define REF_MUTATE_PASS_ARGS(purpose) , file, line, reason, purpose
#else
#define REF_FUNC_EXTRA_ARGS
#define REF_MUTATE_EXTRA_ARGS
#define REF_FUNC_PASS_ARGS(new_reason)
#define REF_MUTATE_PASS_ARGS(x)
#endif
static gpr_atm ref_mutate(grpc_lb_policy *c, gpr_atm delta,
int barrier REF_MUTATE_EXTRA_ARGS) {
gpr_atm old_val = barrier ? gpr_atm_full_fetch_add(&c->ref_pair, delta)
: gpr_atm_no_barrier_fetch_add(&c->ref_pair, delta);
#ifdef GRPC_LB_POLICY_REFCOUNT_DEBUG
gpr_log(file, line, GPR_LOG_SEVERITY_DEBUG,
"LB_POLICY: %p % 12s 0x%08x -> 0x%08x [%s]", c, purpose, old_val,
old_val + delta, reason);
#endif
return old_val;
}
void grpc_lb_policy_ref(grpc_lb_policy *policy REF_FUNC_EXTRA_ARGS) {
ref_mutate(policy, 1 << WEAK_REF_BITS, 0 REF_MUTATE_PASS_ARGS("STRONG_REF"));
}
void grpc_lb_policy_unref(grpc_exec_ctx *exec_ctx,
grpc_lb_policy *policy REF_FUNC_EXTRA_ARGS) {
gpr_atm old_val =
ref_mutate(policy, (gpr_atm)1 - (gpr_atm)(1 << WEAK_REF_BITS),
1 REF_MUTATE_PASS_ARGS("STRONG_UNREF"));
gpr_atm mask = ~(gpr_atm)((1 << WEAK_REF_BITS) - 1);
gpr_atm check = 1 << WEAK_REF_BITS;
if ((old_val & mask) == check) {
policy->vtable->shutdown(exec_ctx, policy);
}
grpc_lb_policy_weak_unref(exec_ctx,
policy REF_FUNC_PASS_ARGS("strong-unref"));
}
void grpc_lb_policy_weak_ref(grpc_lb_policy *policy REF_FUNC_EXTRA_ARGS) {
ref_mutate(policy, 1, 0 REF_MUTATE_PASS_ARGS("WEAK_REF"));
}
void grpc_lb_policy_weak_unref(grpc_exec_ctx *exec_ctx,
grpc_lb_policy *policy REF_FUNC_EXTRA_ARGS) {
gpr_atm old_val =
ref_mutate(policy, -(gpr_atm)1, 1 REF_MUTATE_PASS_ARGS("WEAK_UNREF"));
if (old_val == 1) {
grpc_pollset_set_destroy(policy->interested_parties);
policy->vtable->destroy(exec_ctx, policy);
}
}
int grpc_lb_policy_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy,
grpc_pollset *pollset,
grpc_metadata_batch *initial_metadata,
grpc_connected_subchannel **target,
grpc_closure *on_complete) {
return policy->vtable->pick(exec_ctx, policy, pollset, initial_metadata,
target, on_complete);
}
void grpc_lb_policy_cancel_pick(grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy,
grpc_connected_subchannel **target) {
policy->vtable->cancel_pick(exec_ctx, policy, target);
}
void grpc_lb_policy_exit_idle(grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy) {
policy->vtable->exit_idle(exec_ctx, policy);
}
void grpc_lb_policy_ping_one(grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy,
grpc_closure *closure) {
policy->vtable->ping_one(exec_ctx, policy, closure);
}
void grpc_lb_policy_notify_on_state_change(grpc_exec_ctx *exec_ctx,
grpc_lb_policy *policy,
grpc_connectivity_state *state,
grpc_closure *closure) {
policy->vtable->notify_on_state_change(exec_ctx, policy, state, closure);
}
grpc_connectivity_state grpc_lb_policy_check_connectivity(
grpc_exec_ctx *exec_ctx, grpc_lb_policy *policy) {
return policy->vtable->check_connectivity(exec_ctx, policy);
}
|
