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[Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinl
From: |
Emilio G. Cota |
Subject: |
[Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock |
Date: |
Thu, 7 Apr 2016 13:32:31 -0400 |
From: Guillaume Delbergue <address@hidden>
Signed-off-by: Guillaume Delbergue <address@hidden>
[Rewritten. - Paolo]
Signed-off-by: Paolo Bonzini <address@hidden>
---
include/qemu/thread.h | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/include/qemu/thread.h b/include/qemu/thread.h
index bdae6df..1aa843b 100644
--- a/include/qemu/thread.h
+++ b/include/qemu/thread.h
@@ -1,6 +1,8 @@
#ifndef __QEMU_THREAD_H
#define __QEMU_THREAD_H 1
+#include <errno.h>
+#include "qemu/atomic.h"
typedef struct QemuMutex QemuMutex;
typedef struct QemuCond QemuCond;
@@ -60,4 +62,33 @@ struct Notifier;
void qemu_thread_atexit_add(struct Notifier *notifier);
void qemu_thread_atexit_remove(struct Notifier *notifier);
+typedef struct QemuSpin {
+ int value;
+} QemuSpin;
+
+static inline void qemu_spin_init(QemuSpin *spin)
+{
+ spin->value = 0;
+}
+
+static inline void qemu_spin_lock(QemuSpin *spin)
+{
+ do {
+ while (atomic_read(&spin->value));
+ } while (atomic_xchg(&spin->value, true));
+}
+
+static inline int qemu_spin_trylock(QemuSpin *spin)
+{
+ if (atomic_read(&spin->value) || atomic_xchg(&spin->value, true)) {
+ return -EBUSY;
+ }
+ return 0;
+}
+
+static inline void qemu_spin_unlock(QemuSpin *spin)
+{
+ atomic_mb_set(&spin->value, 0);
+}
+
#endif
--
2.5.0
- [Qemu-devel] [PATCH v2 00/10] tb hash improvements, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 05/13] include/processor.h: define cpu_relax(), Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 12/13] qht: add test program, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 09/13] exec: add tb_hash_func5, derived from xxhash, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 04/13] seqlock: rename write_lock/unlock to write_begin/end, Emilio G. Cota, 2016/04/07
- [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock,
Emilio G. Cota <=
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Alex Bennée, 2016/04/08
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Richard Henderson, 2016/04/08
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Alex Bennée, 2016/04/08
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Paolo Bonzini, 2016/04/08
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Richard Henderson, 2016/04/08
- Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Sergey Fedorov, 2016/04/08
Re: [Qemu-devel] [PATCH v2 06/13] qemu-thread: add simple test-and-set spinlock, Richard Henderson, 2016/04/08
[Qemu-devel] [PATCH v2 10/13] tb hash: hash phys_pc, pc, and flags with xxhash, Emilio G. Cota, 2016/04/07
[Qemu-devel] [PATCH v2 02/13] compiler.h: add QEMU_ALIGNED() to enforce struct alignment, Emilio G. Cota, 2016/04/07