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[PATCH 32/35] qemu_co_rwlock_wrlock
From: |
Paolo Bonzini |
Subject: |
[PATCH 32/35] qemu_co_rwlock_wrlock |
Date: |
Thu, 10 Mar 2022 13:44:10 +0100 |
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
util/qemu-coroutine-lock.c | 36 ++++++++++++++++++++++++++++--------
1 file changed, 28 insertions(+), 8 deletions(-)
diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c
index 5a7b99cfaf..c0541171d4 100644
--- a/util/qemu-coroutine-lock.c
+++ b/util/qemu-coroutine-lock.c
@@ -512,27 +512,47 @@ 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)
+CO_DECLARE_FRAME(qemu_co_rwlock_wrlock, CoRwlock *lock, Coroutine *self,
CoRwTicket my_ticket);
+static CoroutineAction co__qemu_co_rwlock_wrlock(void *_frame)
{
+ struct FRAME__qemu_co_rwlock_wrlock *_f = _frame;
+ CO_ARG(lock);
Coroutine *self = qemu_coroutine_self();
- qemu_co_mutex_lock(&lock->mutex);
+switch(_f->_step) {
+case 0:
+_f->_step = 1;
+CO_SAVE(self);
+ return qemu_co_mutex_lock(&lock->mutex);
+case 1:
+CO_LOAD(self);
if (lock->owners == 0) {
lock->owners = -1;
qemu_co_mutex_unlock(&lock->mutex);
} else {
- CoRwTicket my_ticket = { false, self };
+ _f->my_ticket = (CoRwTicket){ false, self };
- QSIMPLEQ_INSERT_TAIL(&lock->tickets, &my_ticket, next);
+ QSIMPLEQ_INSERT_TAIL(&lock->tickets, &_f->my_ticket, next);
qemu_co_mutex_unlock(&lock->mutex);
- qemu_coroutine_yield();
+_f->_step = 2;
+ return qemu_coroutine_yield();
+case 2:
+CO_LOAD(self);
assert(lock->owners == -1);
}
-
- self->locks_held++;
+ break;
}
+ self->locks_held++;
+return stack_free(&_f->common);
+}
+
+CoroutineAction qemu_co_rwlock_wrlock(CoRwlock *lock)
+{
+ return CO_INIT_FRAME(qemu_co_rwlock_wrlock, lock);
+}
+
+#if 0
void qemu_co_rwlock_upgrade(CoRwlock *lock)
{
qemu_co_mutex_lock(&lock->mutex);
--
2.35.1
- [PATCH 15/35] /basic/self, (continued)
- [PATCH 15/35] /basic/self, Paolo Bonzini, 2022/03/10
- [PATCH 03/35] coroutine: introduce QemuCoLockable, Paolo Bonzini, 2022/03/10
- [PATCH 18/35] /basic/order, Paolo Bonzini, 2022/03/10
- [PATCH 21/35] /perf/yield, Paolo Bonzini, 2022/03/10
- [PATCH 08/35] /basic/lifecycle, Paolo Bonzini, 2022/03/10
- [PATCH 10/35] enable tail call optimization of qemu_co_mutex_lock, Paolo Bonzini, 2022/03/10
- [PATCH 12/35] define magic macros for stackless coroutines, Paolo Bonzini, 2022/03/10
- [PATCH 27/35] /locking/co-mutex/lockable, Paolo Bonzini, 2022/03/10
- [PATCH 16/35] /basic/entered, Paolo Bonzini, 2022/03/10
- [PATCH 30/35] qemu_co_rwlock_unlock, Paolo Bonzini, 2022/03/10
- [PATCH 32/35] qemu_co_rwlock_wrlock,
Paolo Bonzini <=
- [PATCH 13/35] /basic/yield, Paolo Bonzini, 2022/03/10
- [PATCH 14/35] /basic/nesting, Paolo Bonzini, 2022/03/10
- [PATCH 19/35] /perf/lifecycle, Paolo Bonzini, 2022/03/10
- [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