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
|
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <unistd.h>
#include "wasm.h"
#define own
const int N_THREADS = 10;
const int N_REPS = 3;
// A function to be called from Wasm code.
own wasm_trap_t* callback(const wasm_val_vec_t* args, wasm_val_vec_t* results) {
assert(args->data[0].kind == WASM_I32);
printf("> Thread %d running\n", args->data[0].of.i32);
return NULL;
}
typedef struct {
wasm_engine_t* engine;
wasm_shared_module_t* module;
int id;
} thread_args;
void* run(void* args_abs) {
thread_args* args = (thread_args*)args_abs;
// Recreate store and module.
own wasm_store_t* store = wasm_store_new(args->engine);
own wasm_module_t* module = wasm_module_obtain(store, args->module);
// Run the example N times.
for (int i = 0; i < N_REPS; ++i) {
usleep(100000);
// Create imports.
own wasm_functype_t* func_type = wasm_functype_new_1_0(wasm_valtype_new_i32());
own wasm_func_t* func = wasm_func_new(store, func_type, callback);
wasm_functype_delete(func_type);
wasm_val_t val = WASM_I32_VAL((int32_t)args->id);
own wasm_globaltype_t* global_type =
wasm_globaltype_new(wasm_valtype_new_i32(), WASM_CONST);
own wasm_global_t* global = wasm_global_new(store, global_type, &val);
wasm_globaltype_delete(global_type);
// Instantiate.
wasm_extern_t* externs[] = {
wasm_func_as_extern(func), wasm_global_as_extern(global),
};
wasm_extern_vec_t imports = WASM_ARRAY_VEC(externs);
own wasm_instance_t* instance =
wasm_instance_new(store, module, &imports, NULL);
if (!instance) {
printf("> Error instantiating module!\n");
return NULL;
}
wasm_func_delete(func);
wasm_global_delete(global);
// Extract export.
own wasm_extern_vec_t exports;
wasm_instance_exports(instance, &exports);
if (exports.size == 0) {
printf("> Error accessing exports!\n");
return NULL;
}
const wasm_func_t *run_func = wasm_extern_as_func(exports.data[0]);
if (run_func == NULL) {
printf("> Error accessing export!\n");
return NULL;
}
wasm_instance_delete(instance);
// Call.
wasm_val_vec_t empty = WASM_EMPTY_VEC;
if (wasm_func_call(run_func, &empty, &empty)) {
printf("> Error calling function!\n");
return NULL;
}
wasm_extern_vec_delete(&exports);
}
wasm_module_delete(module);
wasm_store_delete(store);
free(args_abs);
return NULL;
}
int main(int argc, const char *argv[]) {
// Initialize.
wasm_engine_t* engine = wasm_engine_new();
// Load binary.
FILE* file = fopen("threads.wasm", "rb");
if (!file) {
printf("> Error loading module!\n");
return 1;
}
fseek(file, 0L, SEEK_END);
size_t file_size = ftell(file);
fseek(file, 0L, SEEK_SET);
wasm_byte_vec_t binary;
wasm_byte_vec_new_uninitialized(&binary, file_size);
if (fread(binary.data, file_size, 1, file) != 1) {
printf("> Error loading module!\n");
return 1;
}
fclose(file);
// Compile and share.
own wasm_store_t* store = wasm_store_new(engine);
own wasm_module_t* module = wasm_module_new(store, &binary);
if (!module) {
printf("> Error compiling module!\n");
return 1;
}
wasm_byte_vec_delete(&binary);
own wasm_shared_module_t* shared = wasm_module_share(module);
wasm_module_delete(module);
wasm_store_delete(store);
// Spawn threads.
pthread_t threads[N_THREADS];
for (int i = 0; i < N_THREADS; i++) {
thread_args* args = malloc(sizeof(thread_args));
args->id = i;
args->engine = engine;
args->module = shared;
printf("Initializing thread %d...\n", i);
pthread_create(&threads[i], NULL, &run, args);
}
for (int i = 0; i < N_THREADS; i++) {
printf("Waiting for thread: %d\n", i);
pthread_join(threads[i], NULL);
}
wasm_shared_module_delete(shared);
wasm_engine_delete(engine);
return 0;
}
|
