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
|
/*
* Copyright (C) 2022 Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "bh_log.h"
#include "thread_manager.h"
#include "tid_allocator.h"
#if WASM_ENABLE_INTERP != 0
#include "wasm_runtime.h"
#endif
#if WASM_ENABLE_AOT != 0
#include "aot_runtime.h"
#endif
static const char *THREAD_START_FUNCTION = "wasi_thread_start";
static korp_mutex thread_id_lock;
static TidAllocator tid_allocator;
typedef struct {
/* app's entry function */
wasm_function_inst_t start_func;
/* arg of the app's entry function */
uint32 arg;
/* thread id passed to the app */
int32 thread_id;
} ThreadStartArg;
static int32
allocate_thread_id()
{
os_mutex_lock(&thread_id_lock);
int32 id = tid_allocator_get_tid(&tid_allocator);
os_mutex_unlock(&thread_id_lock);
return id;
}
void
deallocate_thread_id(int32 thread_id)
{
os_mutex_lock(&thread_id_lock);
tid_allocator_release_tid(&tid_allocator, thread_id);
os_mutex_unlock(&thread_id_lock);
}
static void *
thread_start(void *arg)
{
wasm_exec_env_t exec_env = (wasm_exec_env_t)arg;
ThreadStartArg *thread_arg = exec_env->thread_arg;
uint32 argv[2];
wasm_exec_env_set_thread_info(exec_env);
argv[0] = thread_arg->thread_id;
argv[1] = thread_arg->arg;
if (!wasm_runtime_call_wasm(exec_env, thread_arg->start_func, 2, argv)) {
/* Exception has already been spread during throwing */
}
// Routine exit
deallocate_thread_id(thread_arg->thread_id);
wasm_runtime_free(thread_arg);
exec_env->thread_arg = NULL;
return NULL;
}
static int32
thread_spawn_wrapper(wasm_exec_env_t exec_env, uint32 start_arg)
{
wasm_module_t module = wasm_exec_env_get_module(exec_env);
wasm_module_inst_t module_inst = get_module_inst(exec_env);
wasm_module_inst_t new_module_inst = NULL;
ThreadStartArg *thread_start_arg = NULL;
wasm_function_inst_t start_func;
int32 thread_id;
uint32 stack_size = 8192;
int32 ret = -1;
#if WASM_ENABLE_LIBC_WASI != 0
WASIContext *wasi_ctx;
#endif
bh_assert(module);
bh_assert(module_inst);
stack_size = ((WASMModuleInstance *)module_inst)->default_wasm_stack_size;
if (!(new_module_inst = wasm_runtime_instantiate_internal(
module, true, exec_env, stack_size, 0, NULL, 0)))
return -1;
wasm_runtime_set_custom_data_internal(
new_module_inst, wasm_runtime_get_custom_data(module_inst));
if (!(wasm_cluster_dup_c_api_imports(new_module_inst, module_inst)))
goto thread_preparation_fail;
#if WASM_ENABLE_LIBC_WASI != 0
wasi_ctx = wasm_runtime_get_wasi_ctx(module_inst);
if (wasi_ctx)
wasm_runtime_set_wasi_ctx(new_module_inst, wasi_ctx);
#endif
start_func = wasm_runtime_lookup_function(new_module_inst,
THREAD_START_FUNCTION, NULL);
if (!start_func) {
LOG_ERROR("Failed to find thread start function %s",
THREAD_START_FUNCTION);
goto thread_preparation_fail;
}
if (!(thread_start_arg = wasm_runtime_malloc(sizeof(ThreadStartArg)))) {
LOG_ERROR("Runtime args allocation failed");
goto thread_preparation_fail;
}
thread_start_arg->thread_id = thread_id = allocate_thread_id();
if (thread_id < 0) {
LOG_ERROR("Failed to get thread identifier");
goto thread_preparation_fail;
}
thread_start_arg->arg = start_arg;
thread_start_arg->start_func = start_func;
ret = wasm_cluster_create_thread(exec_env, new_module_inst, false,
thread_start, thread_start_arg);
if (ret != 0) {
LOG_ERROR("Failed to spawn a new thread");
goto thread_spawn_fail;
}
return thread_id;
thread_spawn_fail:
deallocate_thread_id(thread_id);
thread_preparation_fail:
if (new_module_inst)
wasm_runtime_deinstantiate_internal(new_module_inst, true);
if (thread_start_arg)
wasm_runtime_free(thread_start_arg);
return -1;
}
/* clang-format off */
#define REG_NATIVE_FUNC(name, func_name, signature) \
{ name, func_name##_wrapper, signature, NULL }
/* clang-format on */
static NativeSymbol native_symbols_lib_wasi_threads[] = { REG_NATIVE_FUNC(
"thread-spawn", thread_spawn, "(i)i") };
uint32
get_lib_wasi_threads_export_apis(NativeSymbol **p_lib_wasi_threads_apis)
{
*p_lib_wasi_threads_apis = native_symbols_lib_wasi_threads;
return sizeof(native_symbols_lib_wasi_threads) / sizeof(NativeSymbol);
}
bool
lib_wasi_threads_init(void)
{
if (0 != os_mutex_init(&thread_id_lock))
return false;
if (!tid_allocator_init(&tid_allocator)) {
os_mutex_destroy(&thread_id_lock);
return false;
}
return true;
}
void
lib_wasi_threads_destroy(void)
{
tid_allocator_deinit(&tid_allocator);
os_mutex_destroy(&thread_id_lock);
}
|
