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authorDaniel P. Berrange <berrange@redhat.com>2015-09-01 14:48:02 +0100
committerDaniel P. Berrange <berrange@redhat.com>2015-10-20 14:59:04 +0100
commit10817bf09d5f8cb22711fb0ee8d8da49f6f05f89 (patch)
tree735f6b70cedecd57843b9108cb68e2359e147e0c /coroutine-win32.c
parent57cb38b3833c5215131b983f181b26d6ba9b8d35 (diff)
downloadqemu-arm-10817bf09d5f8cb22711fb0ee8d8da49f6f05f89.tar.gz
coroutine: move into libqemuutil.a library
The coroutine files are currently referenced by the block-obj-y variable. The coroutine functionality though is already used by more than just the block code. eg migration code uses coroutine yield. In the future the I/O channel code will also use the coroutine yield functionality. Since the coroutine code is nicely self-contained it can be easily built as part of the libqemuutil.a library, making it widely available. The headers are also moved into include/qemu, instead of the include/block directory, since they are now part of the util codebase, and the impl was never in the block/ directory either. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Diffstat (limited to 'coroutine-win32.c')
-rw-r--r--coroutine-win32.c101
1 files changed, 0 insertions, 101 deletions
diff --git a/coroutine-win32.c b/coroutine-win32.c
deleted file mode 100644
index 17ace37dee..0000000000
--- a/coroutine-win32.c
+++ /dev/null
@@ -1,101 +0,0 @@
-/*
- * Win32 coroutine initialization code
- *
- * Copyright (c) 2011 Kevin Wolf <kwolf@redhat.com>
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-#include "qemu-common.h"
-#include "block/coroutine_int.h"
-
-typedef struct
-{
- Coroutine base;
-
- LPVOID fiber;
- CoroutineAction action;
-} CoroutineWin32;
-
-static __thread CoroutineWin32 leader;
-static __thread Coroutine *current;
-
-/* This function is marked noinline to prevent GCC from inlining it
- * into coroutine_trampoline(). If we allow it to do that then it
- * hoists the code to get the address of the TLS variable "current"
- * out of the while() loop. This is an invalid transformation because
- * the SwitchToFiber() call may be called when running thread A but
- * return in thread B, and so we might be in a different thread
- * context each time round the loop.
- */
-CoroutineAction __attribute__((noinline))
-qemu_coroutine_switch(Coroutine *from_, Coroutine *to_,
- CoroutineAction action)
-{
- CoroutineWin32 *from = DO_UPCAST(CoroutineWin32, base, from_);
- CoroutineWin32 *to = DO_UPCAST(CoroutineWin32, base, to_);
-
- current = to_;
-
- to->action = action;
- SwitchToFiber(to->fiber);
- return from->action;
-}
-
-static void CALLBACK coroutine_trampoline(void *co_)
-{
- Coroutine *co = co_;
-
- while (true) {
- co->entry(co->entry_arg);
- qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE);
- }
-}
-
-Coroutine *qemu_coroutine_new(void)
-{
- const size_t stack_size = 1 << 20;
- CoroutineWin32 *co;
-
- co = g_malloc0(sizeof(*co));
- co->fiber = CreateFiber(stack_size, coroutine_trampoline, &co->base);
- return &co->base;
-}
-
-void qemu_coroutine_delete(Coroutine *co_)
-{
- CoroutineWin32 *co = DO_UPCAST(CoroutineWin32, base, co_);
-
- DeleteFiber(co->fiber);
- g_free(co);
-}
-
-Coroutine *qemu_coroutine_self(void)
-{
- if (!current) {
- current = &leader.base;
- leader.fiber = ConvertThreadToFiber(NULL);
- }
- return current;
-}
-
-bool qemu_in_coroutine(void)
-{
- return current && current->caller;
-}