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[PATCH 31/35] qemu_co_rwlock_downgrade
From: |
Paolo Bonzini |
Subject: |
[PATCH 31/35] qemu_co_rwlock_downgrade |
Date: |
Thu, 10 Mar 2022 13:44:09 +0100 |
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
util/qemu-coroutine-lock.c | 26 ++++++++++++++++++++++----
1 file changed, 22 insertions(+), 4 deletions(-)
diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c
index c164cf6b15..5a7b99cfaf 100644
--- a/util/qemu-coroutine-lock.c
+++ b/util/qemu-coroutine-lock.c
@@ -484,17 +484,35 @@ CoroutineAction qemu_co_rwlock_unlock(CoRwlock *lock)
return CO_INIT_FRAME(qemu_co_rwlock_unlock, lock);
}
-#if 0
-void qemu_co_rwlock_downgrade(CoRwlock *lock)
+CO_DECLARE_FRAME(qemu_co_rwlock_downgrade, CoRwlock *lock);
+static CoroutineAction co__qemu_co_rwlock_downgrade(void *_frame)
{
- qemu_co_mutex_lock(&lock->mutex);
+ struct FRAME__qemu_co_rwlock_downgrade *_f = _frame;
+ CO_ARG(lock);
+
+switch(_f->_step) {
+case 0:
+_f->_step = 1;
+ return qemu_co_mutex_lock(&lock->mutex);
+case 1:
assert(lock->owners == -1);
lock->owners = 1;
/* Possibly wake another reader, which will wake the next in line. */
- qemu_co_rwlock_maybe_wake_one(lock);
+_f->_step = 2;
+ return qemu_co_rwlock_maybe_wake_one(lock);
+case 2:
+ break;
+}
+return stack_free(&_f->common);
}
+CoroutineAction qemu_co_rwlock_downgrade(CoRwlock *lock)
+{
+ return CO_INIT_FRAME(qemu_co_rwlock_downgrade, lock);
+}
+
+#if 0
void qemu_co_rwlock_wrlock(CoRwlock *lock)
{
Coroutine *self = qemu_coroutine_self();
--
2.35.1
- [PATCH 20/35] /perf/nesting, (continued)
- [PATCH 20/35] /perf/nesting, Paolo Bonzini, 2022/03/10
- [PATCH 25/35] /locking/co-mutex, Paolo Bonzini, 2022/03/10
- [PATCH 26/35] convert qemu_co_mutex_lock_slowpath to magic macros, Paolo Bonzini, 2022/03/10
- [PATCH 29/35] qemu_co_rwlock_rdlock, Paolo Bonzini, 2022/03/10
- [PATCH 17/35] /basic/in_coroutine, Paolo Bonzini, 2022/03/10
- [PATCH 11/35] convert CoMutex to stackless coroutines, Paolo Bonzini, 2022/03/10
- [PATCH 22/35] /perf/function-call, Paolo Bonzini, 2022/03/10
- [PATCH 23/35] /perf/cost, Paolo Bonzini, 2022/03/10
- [PATCH 24/35] /basic/no-dangling-access, Paolo Bonzini, 2022/03/10
- [PATCH 28/35] qemu_co_rwlock_maybe_wake_one, Paolo Bonzini, 2022/03/10
- [PATCH 31/35] qemu_co_rwlock_downgrade,
Paolo Bonzini <=
- [PATCH 34/35] /locking/co-rwlock/upgrade, Paolo Bonzini, 2022/03/10
- [PATCH 35/35] /locking/co-rwlock/downgrade, Paolo Bonzini, 2022/03/10
- [PATCH 33/35] qemu_co_rwlock_upgrade, Paolo Bonzini, 2022/03/10
- Re: [PATCH experiment 00/35] stackless coroutine backend, Stefan Hajnoczi, 2022/03/10
- Re: [PATCH experiment 00/35] stackless coroutine backend, Paolo Bonzini, 2022/03/10
- Re: [PATCH experiment 00/35] stackless coroutine backend, Stefan Hajnoczi, 2022/03/11
- Re: [PATCH experiment 00/35] stackless coroutine backend, Paolo Bonzini, 2022/03/11
- Re: [PATCH experiment 00/35] stackless coroutine backend, Daniel P . Berrangé, 2022/03/11
- Re: [PATCH experiment 00/35] stackless coroutine backend, Paolo Bonzini, 2022/03/13
- Re: [PATCH experiment 00/35] stackless coroutine backend, Stefan Hajnoczi, 2022/03/14