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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* Posix implementation for gpr threads. */
#include <grpc/support/port_platform.h>
#ifdef GPR_POSIX_SYNC
#include "src/core/lib/gprpp/thd.h"
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd_id.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include "src/core/lib/gpr/fork.h"
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/memory.h"
namespace grpc_core {
namespace {
gpr_mu g_mu;
gpr_cv g_cv;
int g_thread_count;
int g_awaiting_threads;
class ThreadInternalsPosix;
struct thd_arg {
ThreadInternalsPosix* thread;
void (*body)(void* arg); /* body of a thread */
void* arg; /* argument to a thread */
const char* name; /* name of thread. Can be nullptr. */
};
class ThreadInternalsPosix
: public grpc_core::internal::ThreadInternalsInterface {
public:
ThreadInternalsPosix(const char* thd_name, void (*thd_body)(void* arg),
void* arg, bool* success)
: started_(false) {
gpr_mu_init(&mu_);
gpr_cv_init(&ready_);
pthread_attr_t attr;
/* don't use gpr_malloc as we may cause an infinite recursion with
* the profiling code */
thd_arg* info = static_cast<thd_arg*>(malloc(sizeof(*info)));
GPR_ASSERT(info != nullptr);
info->thread = this;
info->body = thd_body;
info->arg = arg;
info->name = thd_name;
inc_thd_count();
GPR_ASSERT(pthread_attr_init(&attr) == 0);
GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) ==
0);
*success =
(pthread_create(&pthread_id_, &attr,
[](void* v) -> void* {
thd_arg arg = *static_cast<thd_arg*>(v);
free(v);
if (arg.name != nullptr) {
#if GPR_APPLE_PTHREAD_NAME
/* Apple supports 64 characters, and will
* truncate if it's longer. */
pthread_setname_np(arg.name);
#elif GPR_LINUX_PTHREAD_NAME
/* Linux supports 16 characters max, and will
* error if it's longer. */
char buf[16];
size_t buf_len = GPR_ARRAY_SIZE(buf) - 1;
strncpy(buf, arg.name, buf_len);
buf[buf_len] = '\0';
pthread_setname_np(pthread_self(), buf);
#endif // GPR_APPLE_PTHREAD_NAME
}
gpr_mu_lock(&arg.thread->mu_);
while (!arg.thread->started_) {
gpr_cv_wait(&arg.thread->ready_, &arg.thread->mu_,
gpr_inf_future(GPR_CLOCK_MONOTONIC));
}
gpr_mu_unlock(&arg.thread->mu_);
(*arg.body)(arg.arg);
dec_thd_count();
return nullptr;
},
info) == 0);
GPR_ASSERT(pthread_attr_destroy(&attr) == 0);
if (!success) {
/* don't use gpr_free, as this was allocated using malloc (see above) */
free(info);
dec_thd_count();
}
};
~ThreadInternalsPosix() override {
gpr_mu_destroy(&mu_);
gpr_cv_destroy(&ready_);
}
void Start() override {
gpr_mu_lock(&mu_);
started_ = true;
gpr_cv_signal(&ready_);
gpr_mu_unlock(&mu_);
}
void Join() override { pthread_join(pthread_id_, nullptr); }
private:
/*****************************************
* Only used when fork support is enabled
*/
static void inc_thd_count() {
if (grpc_fork_support_enabled()) {
gpr_mu_lock(&g_mu);
g_thread_count++;
gpr_mu_unlock(&g_mu);
}
}
static void dec_thd_count() {
if (grpc_fork_support_enabled()) {
gpr_mu_lock(&g_mu);
g_thread_count--;
if (g_awaiting_threads && g_thread_count == 0) {
gpr_cv_signal(&g_cv);
}
gpr_mu_unlock(&g_mu);
}
}
gpr_mu mu_;
gpr_cv ready_;
bool started_;
pthread_t pthread_id_;
};
} // namespace
Thread::Thread(const char* thd_name, void (*thd_body)(void* arg), void* arg,
bool* success) {
bool outcome = false;
impl_ =
grpc_core::New<ThreadInternalsPosix>(thd_name, thd_body, arg, &outcome);
if (outcome) {
state_ = ALIVE;
} else {
state_ = FAILED;
grpc_core::Delete(impl_);
impl_ = nullptr;
}
if (success != nullptr) {
*success = outcome;
}
}
void Thread::Init() {
gpr_mu_init(&g_mu);
gpr_cv_init(&g_cv);
g_thread_count = 0;
g_awaiting_threads = 0;
}
bool Thread::AwaitAll(gpr_timespec deadline) {
gpr_mu_lock(&g_mu);
g_awaiting_threads = 1;
int res = 0;
while ((g_thread_count > 0) &&
(gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), deadline) < 0)) {
res = gpr_cv_wait(&g_cv, &g_mu, deadline);
}
g_awaiting_threads = 0;
gpr_mu_unlock(&g_mu);
return res == 0;
}
} // namespace grpc_core
// The following is in the external namespace as it is exposed as C89 API
gpr_thd_id gpr_thd_currentid(void) { return (gpr_thd_id)pthread_self(); }
#endif /* GPR_POSIX_SYNC */
|
