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rcu: add g_free_rcu

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This simplifies calling g_free from an RCU callback.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-02-11 15:00:12 +01:00
parent 341774fe6c
commit 439c5e02d5
2 changed files with 15 additions and 4 deletions
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11
docs/rcu.txt
View File

@ -120,12 +120,15 @@ The core RCU API is small:
void call_rcu(T *p,
void (*func)(T *p),
field-name);
void g_free_rcu(T *p,
field-name);
call_rcu1 is typically used through this macro, in the common case
where the "struct rcu_head" is the first field in the struct. In
the above case, one could have written simply:
call_rcu1 is typically used through these macro, in the common case
where the "struct rcu_head" is the first field in the struct. If
the callback function is g_free, in particular, g_free_rcu can be
used. In the above case, one could have written simply:
call_rcu(foo_reclaim, g_free, rcu);
g_free_rcu(foo_reclaim, rcu);
typeof(*p) atomic_rcu_read(p);

8
include/qemu/rcu.h
View File

@ -140,6 +140,14 @@ extern void call_rcu1(struct rcu_head *head, RCUCBFunc *func);
}), \
(RCUCBFunc *)(func))
#define g_free_rcu(obj, field) \
call_rcu1(({ \
char __attribute__((unused)) \
offset_must_be_zero[-offsetof(typeof(*(obj)), field)]; \
&(obj)->field; \
}), \
(RCUCBFunc *)g_free);
#ifdef __cplusplus
}
#endif