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libusb: implement libusb_pollfds_handle_timeouts

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This function tells applications who maintain the pollfds themselves if
they should handle the timeout for each xfer themselves. In FreeBSD, the
timeout for each xfer is handled by kernel and doesn't need a special timer to
do so. Therefore, we return 1 to indicate that it is handled by libusb
internally.

Approved by:    lwhsu (mentor), markj (mentor)
Sponsored by:   The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D51742
This commit is contained in:
ShengYi Hung 2025-08-05 11:25:31 -04:00
parent c43a850451
commit b0d5c1cfda
3 changed files with 15 additions and 0 deletions
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8
lib/libusb/libusb.3
View file

@ -734,6 +734,14 @@ another thread is already doing so.
Must be called with the event lock held.
.Pp
.Ft int
.Fn libusb_pollfds_handle_timeouts "libusb_context *ctx"
This function determines whether applications maintaining libusb events using
.Fn libusb_get_pollfds
are responsible for handling timeout events themselves.
Returns 1 if libusb handles the timeout internally, 0 if the application
needs to set a dedicated timer to handle it.
.Pp
.Ft int
.Fn libusb_get_next_timeout "libusb_context *ctx" "struct timeval *tv"
Determine the next internal timeout that libusb needs to handle.
Returns 0

1
lib/libusb/libusb.h
View file

@ -587,6 +587,7 @@ int libusb_handle_events_completed(libusb_context * ctx, int *completed);
int libusb_handle_events_timeout(libusb_context * ctx, struct timeval *tv);
int libusb_handle_events(libusb_context * ctx);
int libusb_handle_events_locked(libusb_context * ctx, struct timeval *tv);
int libusb_pollfds_handle_timeouts(libusb_context *ctx);
int libusb_get_next_timeout(libusb_context * ctx, struct timeval *tv);
void libusb_set_pollfd_notifiers(libusb_context * ctx, libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb, void *user_data);
const struct libusb_pollfd **libusb_get_pollfds(libusb_context *ctx);

6
lib/libusb/libusb10_io.c
View file

@ -422,6 +422,12 @@ libusb_get_next_timeout(libusb_context *ctx, struct timeval *tv)
return (0);
}
int
libusb_pollfds_handle_timeouts(libusb_context *ctx)
{
return (1);
}
void
libusb_set_pollfd_notifiers(libusb_context *ctx,
libusb_pollfd_added_cb added_cb, libusb_pollfd_removed_cb removed_cb,