qdev: remove baked in notion of aliases (v2)
[qemu.git] / coroutine-win32.c
1 /*
2 * Win32 coroutine initialization code
3 *
4 * Copyright (c) 2011 Kevin Wolf <kwolf@redhat.com>
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include "qemu-common.h"
26 #include "qemu-coroutine-int.h"
27
28 typedef struct
29 {
30 Coroutine base;
31
32 LPVOID fiber;
33 CoroutineAction action;
34 } CoroutineWin32;
35
36 static __thread CoroutineWin32 leader;
37 static __thread Coroutine *current;
38
39 CoroutineAction qemu_coroutine_switch(Coroutine *from_, Coroutine *to_,
40 CoroutineAction action)
41 {
42 CoroutineWin32 *from = DO_UPCAST(CoroutineWin32, base, from_);
43 CoroutineWin32 *to = DO_UPCAST(CoroutineWin32, base, to_);
44
45 current = to_;
46
47 to->action = action;
48 SwitchToFiber(to->fiber);
49 return from->action;
50 }
51
52 static void CALLBACK coroutine_trampoline(void *co_)
53 {
54 Coroutine *co = co_;
55
56 while (true) {
57 co->entry(co->entry_arg);
58 qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE);
59 }
60 }
61
62 Coroutine *qemu_coroutine_new(void)
63 {
64 const size_t stack_size = 1 << 20;
65 CoroutineWin32 *co;
66
67 co = g_malloc0(sizeof(*co));
68 co->fiber = CreateFiber(stack_size, coroutine_trampoline, &co->base);
69 return &co->base;
70 }
71
72 void qemu_coroutine_delete(Coroutine *co_)
73 {
74 CoroutineWin32 *co = DO_UPCAST(CoroutineWin32, base, co_);
75
76 DeleteFiber(co->fiber);
77 g_free(co);
78 }
79
80 Coroutine *qemu_coroutine_self(void)
81 {
82 if (!current) {
83 current = &leader.base;
84 leader.fiber = ConvertThreadToFiber(NULL);
85 }
86 return current;
87 }
88
89 bool qemu_in_coroutine(void)
90 {
91 return current && current->caller;
92 }