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[Qemu-devel] [PATCH v5 01/13] atomic: introduce atomic_dec_fetch.
From: |
Alex Bennée |
Subject: |
[Qemu-devel] [PATCH v5 01/13] atomic: introduce atomic_dec_fetch. |
Date: |
Tue, 2 Aug 2016 18:27:32 +0100 |
Useful for counting down.
Signed-off-by: Alex Bennée <address@hidden>
Signed-off-by: Sergey Fedorov <address@hidden>
---
include/qemu/atomic.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/qemu/atomic.h b/include/qemu/atomic.h
index 7e13fca..560b1af 100644
--- a/include/qemu/atomic.h
+++ b/include/qemu/atomic.h
@@ -160,6 +160,8 @@
#define atomic_fetch_and(ptr, n) __atomic_fetch_and(ptr, n, __ATOMIC_SEQ_CST)
#define atomic_fetch_or(ptr, n) __atomic_fetch_or(ptr, n, __ATOMIC_SEQ_CST)
+#define atomic_dec_fetch(ptr) __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)
+
/* And even shorter names that return void. */
#define atomic_inc(ptr) ((void) __atomic_fetch_add(ptr, 1,
__ATOMIC_SEQ_CST))
#define atomic_dec(ptr) ((void) __atomic_fetch_sub(ptr, 1,
__ATOMIC_SEQ_CST))
@@ -355,6 +357,8 @@
#define atomic_fetch_or __sync_fetch_and_or
#define atomic_cmpxchg __sync_val_compare_and_swap
+#define atomic_dec_fetch(ptr) __sync_sub_and_fetch(ptr, 1)
+
/* And even shorter names that return void. */
#define atomic_inc(ptr) ((void) __sync_fetch_and_add(ptr, 1))
#define atomic_dec(ptr) ((void) __sync_fetch_and_add(ptr, -1))
--
2.7.4
- [Qemu-devel] [PATCH v5 00/13] cpu-exec: Safe work in quiescent state, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 01/13] atomic: introduce atomic_dec_fetch.,
Alex Bennée <=
- [Qemu-devel] [PATCH v5 05/13] cpus: Rename flush_queued_work(), Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 08/13] linux-user: Add qemu_cpu_is_self() and qemu_cpu_kick(), Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 02/13] cpus: pass CPUState to run_on_cpu helpers, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 04/13] cpus: Wrap mutex used to protect CPU work, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 03/13] cpus: Move common code out of {async_, }run_on_cpu(), Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 07/13] linux-user: Rework exclusive operation mechanism, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 06/13] linux-user: Use QemuMutex and QemuCond, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 12/13] tcg: Make tb_flush() thread safe, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 10/13] bsd-user: Support CPU work queue, Alex Bennée, 2016/08/02
- [Qemu-devel] [PATCH v5 13/13] cpu-exec: replace cpu->queued_work with GArray, Alex Bennée, 2016/08/02