[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-devel] [PULL 51/74] seqlock: add QemuLockable support
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PULL 51/74] seqlock: add QemuLockable support |
Date: |
Tue, 21 Aug 2018 19:02:23 +0200 |
A shortcut when the seqlock write is protected by a spinlock or any mutex
other than the BQL.
Signed-off-by: Paolo Bonzini <address@hidden>
---
include/qemu/seqlock.h | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/include/qemu/seqlock.h b/include/qemu/seqlock.h
index c367516..fd408b7 100644
--- a/include/qemu/seqlock.h
+++ b/include/qemu/seqlock.h
@@ -16,6 +16,7 @@
#include "qemu/atomic.h"
#include "qemu/thread.h"
+#include "qemu/lockable.h"
typedef struct QemuSeqLock QemuSeqLock;
@@ -45,6 +46,25 @@ static inline void seqlock_write_end(QemuSeqLock *sl)
atomic_set(&sl->sequence, sl->sequence + 1);
}
+/* Lock out other writers and update the count. */
+static inline void seqlock_write_lock_impl(QemuSeqLock *sl, QemuLockable *lock)
+{
+ qemu_lockable_lock(lock);
+ seqlock_write_begin(sl);
+}
+#define seqlock_write_lock(sl, lock) \
+ seqlock_write_lock_impl(sl, QEMU_MAKE_LOCKABLE(lock))
+
+/* Lock out other writers and update the count. */
+static inline void seqlock_write_unlock_impl(QemuSeqLock *sl, QemuLockable
*lock)
+{
+ qemu_lockable_unlock(lock);
+ seqlock_write_begin(sl);
+}
+#define seqlock_write_unlock(sl, lock) \
+ seqlock_write_unlock_impl(sl, QEMU_MAKE_LOCKABLE(lock))
+
+
static inline unsigned seqlock_read_begin(const QemuSeqLock *sl)
{
/* Always fail if a write is in progress. */
--
1.8.3.1
- [Qemu-devel] [PULL 32/74] kvm: add call to qemu_add_opts() for -overcommit option, (continued)
- [Qemu-devel] [PULL 32/74] kvm: add call to qemu_add_opts() for -overcommit option, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 25/74] hmp-commands: add sync-profile, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 47/74] hw/intc/apic: Switch away from old_mmio, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 28/74] update-linux-headers.sh: add qemu_fw_cfg.h, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 34/74] target-i386: Fix lcall/ljmp to call gate in IA-32e mode, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 37/74] rcu_queue: remove barrier from QLIST_EMPTY_RCU, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 17/74] seqlock: constify seqlock_read_begin, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 43/74] tests: add test-list-simpleq, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 44/74] tests: add test-rcu-tailq, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 49/74] module: Use QEMU_MODULE_DIR as a search path, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 51/74] seqlock: add QemuLockable support,
Paolo Bonzini <=
- [Qemu-devel] [PULL 41/74] test-rcu-list: access counters with atomics, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 39/74] rcu_queue: add RCU QTAILQ, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 46/74] qom: convert the CPU list to RCU, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 23/74] tests/atomic_add-bench: add -p to enable sync profiler, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 52/74] cpus: protect TimerState writes with a spinlock, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 38/74] rcu_queue: add RCU QSIMPLEQ, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 45/74] spapr: do not use CPU_FOREACH_REVERSE, Paolo Bonzini, 2018/08/21
- [Qemu-devel] [PULL 30/74] i386: Fix arch_query_cpu_model_expansion() leak, Paolo Bonzini, 2018/08/21