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dm: enhence the mevent API

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There is one race issue between mevent callback (which is called
in mevent_dispatch thread) and mevent_delete (which could be called
in dev thread). And the callback is called after mevent_delete.

libevent have the exactly same issue. The issue is decripted here:
https://github.com/libevent/libevent/blob/master/whatsnew-2.1.txt

The fixing is:
We introduce a teardown callback to mevent and make sure there is
no race issue between callback and teardown call.

This patch updates the mevent API and the caller as well.

Tracked-On: #1877
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Yin Fengwei
2018-11-22 14:42:01 +08:00
committed by wenlingz
parent eec3a342c4
commit 64d9c59aa1
10 changed files with 52 additions and 35 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
devicemodel/hw/pci/virtio/virtio_console.c
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@@ -679,7 +679,7 @@ virtio_console_add_backend(struct virtio_console *console,
if (virtio_console_backend_can_read(be_type)) {
if (isatty(fd)) {
be->evp = mevent_add(fd, EVF_READ,
virtio_console_backend_read, be);
virtio_console_backend_read, be, NULL, NULL);
if (be->evp == NULL) {
WPRINTF(("vtcon: mevent_add failed\n"));
error = -1;