diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2013-05-24 16:15:51 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2013-05-30 14:20:36 +0200 |
| commit | cedc7f6e289c427c84a9175045b06614be56ec5a (patch) | |
| tree | 50837d92d28e3aac578ba4c20a531c4fc1245b3f /libusb/core.c | |
| parent | 7ced70e14968bd6869a561d2cf8e7ac5a1df8938 (diff) | |
| download | libusb-cedc7f6e289c427c84a9175045b06614be56ec5a.tar.gz | |
hotplug: Add a hotplug_poll backend function
Apps which were written before hotplug support, may listen for hotplug events
on their own and call libusb_get_device_list on device addition.
In this case libusb_get_device_list will likely return a list without the new
device in there, as the hotplug event thread will still be busy enumerating
the device, which may take a while, or may not even have seen the event yet.
To avoid this add a new hotplug_poll backend function and make
libusb_get_device_list call a this before copying ctx->usb_devs to the user.
In this function the backend should ensure any pending hotplug events are
fully processed before returning.
This patch implements hotplug_poll for linux, it should probably be also
implemented for darwin.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'libusb/core.c')
| -rw-r--r-- | libusb/core.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/libusb/core.c b/libusb/core.c index 88757f8..1c3748d 100644 --- a/libusb/core.c +++ b/libusb/core.c @@ -654,6 +654,9 @@ ssize_t API_EXPORTED libusb_get_device_list(libusb_context *ctx, /* backend provides hotplug support */ struct libusb_device *dev; + if (usbi_backend->hotplug_poll) + usbi_backend->hotplug_poll(); + usbi_mutex_lock(&ctx->usb_devs_lock); list_for_each_entry(dev, &ctx->usb_devs, list, struct libusb_device) { discdevs = discovered_devs_append(discdevs, dev); |