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aio: rename bh_lock to list_lock

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This will be used for AioHandlers too.  There is going to be little
or no contention, so it is better to reuse the same lock.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170112180800.21085-2-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini 2017-01-12 19:07:51 +01:00 committed by Stefan Hajnoczi
parent 8f90b5e91d
commit cf2c02c8ea
2 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
async.c
View File

@ -53,14 +53,14 @@ void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.cb = cb,
.opaque = opaque,
};
qemu_mutex_lock(&ctx->bh_lock);
qemu_mutex_lock(&ctx->list_lock);
bh->next = ctx->first_bh;
bh->scheduled = 1;
bh->deleted = 1;
/* Make sure that the members are ready before putting bh into list */
smp_wmb();
ctx->first_bh = bh;
qemu_mutex_unlock(&ctx->bh_lock);
qemu_mutex_unlock(&ctx->list_lock);
aio_notify(ctx);
}
@ -73,12 +73,12 @@ QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.cb = cb,
.opaque = opaque,
};
qemu_mutex_lock(&ctx->bh_lock);
qemu_mutex_lock(&ctx->list_lock);
bh->next = ctx->first_bh;
/* Make sure that the members are ready before putting bh into list */
smp_wmb();
ctx->first_bh = bh;
qemu_mutex_unlock(&ctx->bh_lock);
qemu_mutex_unlock(&ctx->list_lock);
return bh;
}
@ -120,7 +120,7 @@ int aio_bh_poll(AioContext *ctx)
/* remove deleted bhs */
if (!ctx->walking_bh) {
qemu_mutex_lock(&ctx->bh_lock);
qemu_mutex_lock(&ctx->list_lock);
bhp = &ctx->first_bh;
while (*bhp) {
bh = *bhp;
@ -131,7 +131,7 @@ int aio_bh_poll(AioContext *ctx)
bhp = &bh->next;
}
}
qemu_mutex_unlock(&ctx->bh_lock);
qemu_mutex_unlock(&ctx->list_lock);
}
return ret;
@ -270,7 +270,7 @@ aio_ctx_finalize(GSource *source)
}
#endif
qemu_mutex_lock(&ctx->bh_lock);
qemu_mutex_lock(&ctx->list_lock);
while (ctx->first_bh) {
QEMUBH *next = ctx->first_bh->next;
@ -280,12 +280,12 @@ aio_ctx_finalize(GSource *source)
g_free(ctx->first_bh);
ctx->first_bh = next;
}
qemu_mutex_unlock(&ctx->bh_lock);
qemu_mutex_unlock(&ctx->list_lock);
aio_set_event_notifier(ctx, &ctx->notifier, false, NULL, NULL);
event_notifier_cleanup(&ctx->notifier);
qemu_rec_mutex_destroy(&ctx->lock);
qemu_mutex_destroy(&ctx->bh_lock);
qemu_mutex_destroy(&ctx->list_lock);
timerlistgroup_deinit(&ctx->tlg);
}
@ -381,7 +381,7 @@ AioContext *aio_context_new(Error **errp)
ctx->linux_aio = NULL;
#endif
ctx->thread_pool = NULL;
qemu_mutex_init(&ctx->bh_lock);
qemu_mutex_init(&ctx->list_lock);
qemu_rec_mutex_init(&ctx->lock);
timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx);

2
include/block/aio.h
View File

@ -91,7 +91,7 @@ struct AioContext {
uint32_t notify_me;
/* lock to protect between bh's adders and deleter */
QemuMutex bh_lock;
QemuMutex list_lock;
/* Anchor of the list of Bottom Halves belonging to the context */
struct QEMUBH *first_bh;