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graph-lock: Implement guard macros

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Similar to the implementation in lockable.h, implement macros to
automatically take and release the rdlock.

Create the empty GraphLockable and GraphLockableMainloop structs only to
use it as a type for G_DEFINE_AUTOPTR_CLEANUP_FUNC.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221207131838.239125-4-kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Emanuele Giuseppe Esposito 2022-12-07 14:18:23 +01:00 committed by Kevin Wolf
parent aead9dc9d1
commit 8aa77000c2
1 changed files with 66 additions and 0 deletions
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66
include/block/graph-lock.h
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@ -135,5 +135,71 @@ void coroutine_fn bdrv_graph_co_rdunlock(void);
void bdrv_graph_rdlock_main_loop(void);
void bdrv_graph_rdunlock_main_loop(void);
typedef struct GraphLockable { } GraphLockable;
/*
* In C, compound literals have the lifetime of an automatic variable.
* In C++ it would be different, but then C++ wouldn't need QemuLockable
* either...
*/
#define GML_OBJ_() (&(GraphLockable) { })
static inline GraphLockable *graph_lockable_auto_lock(GraphLockable *x)
{
bdrv_graph_co_rdlock();
return x;
}
static inline void graph_lockable_auto_unlock(GraphLockable *x)
{
bdrv_graph_co_rdunlock();
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GraphLockable, graph_lockable_auto_unlock)
#define WITH_GRAPH_RDLOCK_GUARD_(var) \
for (g_autoptr(GraphLockable) var = graph_lockable_auto_lock(GML_OBJ_()); \
var; \
graph_lockable_auto_unlock(var), var = NULL)
#define WITH_GRAPH_RDLOCK_GUARD() \
WITH_GRAPH_RDLOCK_GUARD_(glue(graph_lockable_auto, __COUNTER__))
#define GRAPH_RDLOCK_GUARD(x) \
g_autoptr(GraphLockable) \
glue(graph_lockable_auto, __COUNTER__) G_GNUC_UNUSED = \
graph_lockable_auto_lock(GML_OBJ_())
typedef struct GraphLockableMainloop { } GraphLockableMainloop;
/*
* In C, compound literals have the lifetime of an automatic variable.
* In C++ it would be different, but then C++ wouldn't need QemuLockable
* either...
*/
#define GMLML_OBJ_() (&(GraphLockableMainloop) { })
static inline GraphLockableMainloop *
graph_lockable_auto_lock_mainloop(GraphLockableMainloop *x)
{
bdrv_graph_rdlock_main_loop();
return x;
}
static inline void
graph_lockable_auto_unlock_mainloop(GraphLockableMainloop *x)
{
bdrv_graph_rdunlock_main_loop();
}
G_DEFINE_AUTOPTR_CLEANUP_FUNC(GraphLockableMainloop,
graph_lockable_auto_unlock_mainloop)
#define GRAPH_RDLOCK_GUARD_MAINLOOP(x) \
g_autoptr(GraphLockableMainloop) \
glue(graph_lockable_auto, __COUNTER__) G_GNUC_UNUSED = \
graph_lockable_auto_lock_mainloop(GMLML_OBJ_())
#endif /* GRAPH_LOCK_H */