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[RFC PATCH 1/4] block/aio: Add automatically released aio_context varian
From: |
Philippe Mathieu-Daudé |
Subject: |
[RFC PATCH 1/4] block/aio: Add automatically released aio_context variants |
Date: |
Tue, 5 Oct 2021 20:58:04 +0200 |
Similarly to commit 5626f8c6d46 ("rcu: Add automatically
released rcu_read_lock variants"):
AIO_CONTEXT_ACQUIRE_GUARD() acquires the aio context and then uses
glib's g_auto infrastructure (and thus whatever the compiler's hooks
are) to release it on all exits of the block.
WITH_AIO_CONTEXT_ACQUIRE_GUARD() is similar but is used as a wrapper
for the lock, i.e.:
WITH_AIO_CONTEXT_ACQUIRE_GUARD() {
stuff with context acquired
}
Inspired-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
include/block/aio.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/include/block/aio.h b/include/block/aio.h
index 47fbe9d81f2..4fa5a5c2720 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -294,6 +294,30 @@ void aio_context_acquire(AioContext *ctx);
/* Relinquish ownership of the AioContext. */
void aio_context_release(AioContext *ctx);
+static inline AioContext *aio_context_auto_acquire(AioContext *ctx)
+{
+ aio_context_acquire(ctx);
+ return ctx;
+}
+
+static inline void aio_context_auto_release(AioContext *ctx)
+{
+ aio_context_release(ctx);
+}
+
+G_DEFINE_AUTOPTR_CLEANUP_FUNC(AioContext, aio_context_auto_release)
+
+#define WITH_AIO_CONTEXT_ACQUIRE_GUARD(ctx) \
+ WITH_AIO_CONTEXT_ACQUIRE_GUARD_(glue(_aio_context_auto, __COUNTER__), ctx)
+
+#define WITH_AIO_CONTEXT_ACQUIRE_GUARD_(var, ctx) \
+ for (g_autoptr(AioContext) var = aio_context_auto_acquire(ctx); \
+ (var); aio_context_auto_release(var), (var) = NULL)
+
+#define AIO_CONTEXT_ACQUIRE_GUARD(ctx) \
+ g_autoptr(AioContext) _aio_context_auto __attribute__((unused)) \
+ = aio_context_auto_acquire(ctx)
+
/**
* aio_bh_schedule_oneshot_full: Allocate a new bottom half structure that will
* run only once and as soon as possible.
--
2.31.1