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contrib/libvhost-user: Protect slave fd with mutex

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In future patches we'll be performing commands on the slave-fd driven
by commands on queues, since those queues will be driven by individual
threads we need to make sure they don't attempt to use the slave-fd
for multiple commands in parallel.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2019-03-01 11:18:30 +00:00
parent 0fdc465d7d
commit c25c02b9e6
2 changed files with 23 additions and 4 deletions
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3
contrib/libvhost-user/libvhost-user.h
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@ -19,6 +19,7 @@
#include <stddef.h>
#include <sys/poll.h>
#include <linux/vhost.h>
#include <pthread.h>
#include "standard-headers/linux/virtio_ring.h"
/* Based on qemu/hw/virtio/vhost-user.c */
@ -355,6 +356,8 @@ struct VuDev {
VuVirtq *vq;
VuDevInflightInfo inflight_info;
int log_call_fd;
/* Must be held while using slave_fd */
pthread_mutex_t slave_mutex;
int slave_fd;
uint64_t log_size;
uint8_t *log_table;