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coroutine-lock: introduce qemu_co_queue_enter_all

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Because qemu_co_queue_restart_all does not release the lock, it should
be used only in coroutine context.  Introduce a new function that,
like qemu_co_enter_next, does release the lock, and use it whenever
qemu_co_queue_restart_all was used outside coroutine context.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20220427130830.150180-3-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2022-04-27 15:08:29 +02:00
parent 248af9e80a
commit d6ee15adec
3 changed files with 21 additions and 1 deletions
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13
include/qemu/coroutine.h
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@ -234,6 +234,19 @@ void qemu_co_queue_restart_all(CoQueue *queue);
qemu_co_enter_next_impl(queue, QEMU_MAKE_LOCKABLE(lock))
bool qemu_co_enter_next_impl(CoQueue *queue, QemuLockable *lock);
/**
* Empties the CoQueue, waking the waiting coroutine one at a time. Unlike
* qemu_co_queue_all, this function releases the lock during aio_co_wake
* because it is meant to be used outside coroutine context; in that case, the
* coroutine is entered immediately, before qemu_co_enter_all returns.
*
* If used in coroutine context, qemu_co_enter_all is equivalent to
* qemu_co_queue_all.
*/
#define qemu_co_enter_all(queue, lock) \
qemu_co_enter_all_impl(queue, QEMU_MAKE_LOCKABLE(lock))
void qemu_co_enter_all_impl(CoQueue *queue, QemuLockable *lock);
/**
* Checks if the CoQueue is empty.
*/