Kevin Wolf | 00dccaf | 2011-01-17 16:08:14 +0000 | [diff] [blame] | 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" |
Paolo Bonzini | 737e150 | 2012-12-17 18:19:44 +0100 | [diff] [blame] | 26 | #include "block/coroutine_int.h" |
Kevin Wolf | 00dccaf | 2011-01-17 16:08:14 +0000 | [diff] [blame] | 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 | |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 67 | co = g_malloc0(sizeof(*co)); |
Kevin Wolf | 00dccaf | 2011-01-17 16:08:14 +0000 | [diff] [blame] | 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); |
Anthony Liguori | 7267c09 | 2011-08-20 22:09:37 -0500 | [diff] [blame] | 77 | g_free(co); |
Kevin Wolf | 00dccaf | 2011-01-17 16:08:14 +0000 | [diff] [blame] | 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 | } |