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coroutine-lock: add mutex argument to CoQueue APIs

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All that CoQueue needs in order to become thread-safe is help
from an external mutex.  Add this to the API.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170213181244.16297-6-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-02-13 19:12:43 +01:00 • committed by Stefan Hajnoczi
parent f8c6e1cbc3
commit 1ace7ceac5
9 changed files with 34 additions and 16 deletions
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8
include/qemu/coroutine.h
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@ -160,7 +160,8 @@ void coroutine_fn qemu_co_mutex_unlock(CoMutex *mutex);
/**
* CoQueues are a mechanism to queue coroutines in order to continue executing
* them later.
* them later. They are similar to condition variables, but they need help
* from an external mutex in order to maintain thread-safety.
*/
typedef struct CoQueue {
QSIMPLEQ_HEAD(, Coroutine) entries;
@ -174,9 +175,10 @@ void qemu_co_queue_init(CoQueue *queue);
/**
* Adds the current coroutine to the CoQueue and transfers control to the
* caller of the coroutine.
* caller of the coroutine. The mutex is unlocked during the wait and
* locked again afterwards.
*/
void coroutine_fn qemu_co_queue_wait(CoQueue *queue);
void coroutine_fn qemu_co_queue_wait(CoQueue *queue, CoMutex *mutex);
/**
* Restarts the next coroutine in the CoQueue and removes it from the queue.