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lib: speed up exiting from async handler 

Now we're using libusb_handle_events_timeout_completed()
instead of the deprecated libusb_handle_events_timeout(),
and notify our async state machine when rtlsdr_cancel_async()
is called. This speeds up exiting from any program that uses the
device asynchronously.

Signed-off-by: Steve Markgraf <steve@steve-m.de>
This commit is contained in:
Steve Markgraf 2014-01-24 00:44:36 +01:00
parent e90cd17d36
commit 3409c0315f
1 changed files with 10 additions and 3 deletions
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13
src/librtlsdr.c
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@ -1,6 +1,6 @@
/*
* rtl-sdr, turns your Realtek RTL2832 based DVB dongle into a SDR receiver
* Copyright (C) 2012-2013 by Steve Markgraf <steve@steve-m.de>
* Copyright (C) 2012-2014 by Steve Markgraf <steve@steve-m.de>
* Copyright (C) 2012 by Dimitri Stolnikov <horiz0n@gmx.net>
*
* This program is free software: you can redistribute it and/or modify
@ -96,6 +96,7 @@ struct rtlsdr_dev {
rtlsdr_read_async_cb_t cb;
void *cb_ctx;
enum rtlsdr_async_status async_status;
int async_cancel;
/* rtl demod context */
uint32_t rate; /* Hz */
uint32_t rtl_xtal; /* Hz */
@ -1727,6 +1728,7 @@ int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx,
unsigned int i;
int r = 0;
struct timeval tv = { 1, 0 };
struct timeval zerotv = { 0, 0 };
enum rtlsdr_async_status next_status = RTLSDR_INACTIVE;
if (!dev)
@ -1736,6 +1738,7 @@ int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx,
return -2;
dev->async_status = RTLSDR_RUNNING;
dev->async_cancel = 0;
dev->cb = cb;
dev->cb_ctx = ctx;
@ -1771,7 +1774,7 @@ int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx,
}
while (RTLSDR_INACTIVE != dev->async_status) {
r = libusb_handle_events_timeout(dev->ctx, &tv);
r = libusb_handle_events_timeout_completed(dev->ctx, &tv, &dev->async_cancel);
if (r < 0) {
/*fprintf(stderr, "handle_events returned: %d\n", r);*/
if (r == LIBUSB_ERROR_INTERRUPTED) /* stray signal */
@ -1800,7 +1803,10 @@ int rtlsdr_read_async(rtlsdr_dev_t *dev, rtlsdr_read_async_cb_t cb, void *ctx,
}
if (dev->dev_lost || RTLSDR_INACTIVE == next_status) {
libusb_handle_events_timeout(dev->ctx, &tv);
/* handle any events that still need to
* be handled before exiting after we
* just cancelled all transfers */
libusb_handle_events_timeout_completed(dev->ctx, &zerotv, NULL);
break;
}
}
@ -1821,6 +1827,7 @@ int rtlsdr_cancel_async(rtlsdr_dev_t *dev)
/* if streaming, try to cancel gracefully */
if (RTLSDR_RUNNING == dev->async_status) {
dev->async_status = RTLSDR_CANCELING;
dev->async_cancel = 1;
return 0;
}