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
|
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build cgo
#define WIN64_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include "libcgo.h"
static volatile LONG runtime_init_once_gate = 0;
static volatile LONG runtime_init_once_done = 0;
static CRITICAL_SECTION runtime_init_cs;
static HANDLE runtime_init_wait;
static int runtime_init_done;
// Pre-initialize the runtime synchronization objects
void
_cgo_preinit_init() {
runtime_init_wait = CreateEvent(NULL, TRUE, FALSE, NULL);
if (runtime_init_wait == NULL) {
fprintf(stderr, "runtime: failed to create runtime initialization wait event.\n");
abort();
}
InitializeCriticalSection(&runtime_init_cs);
}
// Make sure that the preinit sequence has run.
void
_cgo_maybe_run_preinit() {
if (!InterlockedExchangeAdd(&runtime_init_once_done, 0)) {
if (InterlockedIncrement(&runtime_init_once_gate) == 1) {
_cgo_preinit_init();
InterlockedIncrement(&runtime_init_once_done);
} else {
// Decrement to avoid overflow.
InterlockedDecrement(&runtime_init_once_gate);
while(!InterlockedExchangeAdd(&runtime_init_once_done, 0)) {
Sleep(0);
}
}
}
}
void
x_cgo_sys_thread_create(void (*func)(void*), void* arg) {
uintptr_t thandle;
thandle = _beginthread(func, 0, arg);
if(thandle == -1) {
fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
abort();
}
}
int
_cgo_is_runtime_initialized() {
EnterCriticalSection(&runtime_init_cs);
int status = runtime_init_done;
LeaveCriticalSection(&runtime_init_cs);
return status;
}
uintptr_t
_cgo_wait_runtime_init_done(void) {
void (*pfn)(struct context_arg*);
_cgo_maybe_run_preinit();
while (!_cgo_is_runtime_initialized()) {
WaitForSingleObject(runtime_init_wait, INFINITE);
}
pfn = _cgo_get_context_function();
if (pfn != nil) {
struct context_arg arg;
arg.Context = 0;
(*pfn)(&arg);
return arg.Context;
}
return 0;
}
void
x_cgo_notify_runtime_init_done(void* dummy) {
_cgo_maybe_run_preinit();
EnterCriticalSection(&runtime_init_cs);
runtime_init_done = 1;
LeaveCriticalSection(&runtime_init_cs);
if (!SetEvent(runtime_init_wait)) {
fprintf(stderr, "runtime: failed to signal runtime initialization complete.\n");
abort();
}
}
// The context function, used when tracing back C calls into Go.
static void (*cgo_context_function)(struct context_arg*);
// Sets the context function to call to record the traceback context
// when calling a Go function from C code. Called from runtime.SetCgoTraceback.
void x_cgo_set_context_function(void (*context)(struct context_arg*)) {
EnterCriticalSection(&runtime_init_cs);
cgo_context_function = context;
LeaveCriticalSection(&runtime_init_cs);
}
// Gets the context function.
void (*(_cgo_get_context_function(void)))(struct context_arg*) {
void (*ret)(struct context_arg*);
EnterCriticalSection(&runtime_init_cs);
ret = cgo_context_function;
LeaveCriticalSection(&runtime_init_cs);
return ret;
}
|
