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direwolf/tq.c
WB2OSZ 8978f2de6c Version 1.0 - Initial commit 
Changes to be committed:
	new file:   .gitattributes
	new file:   .gitignore
	new file:   APRStt-Implementation-Notes.pdf
	new file:   CHANGES.txt
	new file:   LICENSE-dire-wolf.txt
	new file:   LICENSE-other.txt
	new file:   Makefile.linux
	new file:   Makefile.win
	new file:   Quick-Start-Guide-Windows.pdf
	new file:   Raspberry-Pi-APRS.pdf
	new file:   User-Guide.pdf
	new file:   aclients.c
	new file:   aprs_tt.c
	new file:   aprs_tt.h
	new file:   atest.c
	new file:   audio.c
	new file:   audio.h
	new file:   audio_win.c
	new file:   ax25_pad.c
	new file:   ax25_pad.h
	new file:   beacon.c
	new file:   beacon.h
	new file:   config.c
	new file:   config.h
	new file:   decode_aprs.c
	new file:   decode_aprs.h
	new file:   dedupe.c
	new file:   dedupe.h
	new file:   demod.c
	new file:   demod.h
	new file:   demod_9600.c
	new file:   demod_9600.h
	new file:   demod_afsk.c
	new file:   demod_afsk.h
	new file:   digipeater.c
	new file:   digipeater.h
	new file:   direwolf.c
	new file:   direwolf.conf
	new file:   direwolf.desktop
	new file:   direwolf.h
	new file:   dsp.c
	new file:   dsp.h
	new file:   dtmf.c
	new file:   dtmf.h
	new file:   dw-icon.ico
	new file:   dw-icon.png
	new file:   dw-icon.rc
	new file:   dw-start.sh
	new file:   dwgps.c
	new file:   dwgps.h
	new file:   encode_aprs.c
	new file:   encode_aprs.h
	new file:   fcs_calc.c
	new file:   fcs_calc.h
	new file:   fsk_demod_agc.h
	new file:   fsk_demod_state.h
	new file:   fsk_filters.h
	new file:   fsk_gen_filter.h
	new file:   gen_packets.c
	new file:   gen_tone.c
	new file:   gen_tone.h
	new file:   hdlc_rec.c
	new file:   hdlc_rec.h
	new file:   hdlc_rec2.c
	new file:   hdlc_rec2.h
	new file:   hdlc_send.c
	new file:   hdlc_send.h
	new file:   igate.c
	new file:   igate.h
	new file:   kiss.c
	new file:   kiss.h
	new file:   kiss_frame.c
	new file:   kiss_frame.h
	new file:   kissnet.c
	new file:   kissnet.h
	new file:   latlong.c
	new file:   latlong.h
	new file:   ll2utm.c
	new file:   misc/README-dire-wolf.txt
	new file:   misc/strcasestr.c
	new file:   misc/strsep.c
	new file:   misc/strtok_r.c
	new file:   morse.c
	new file:   multi_modem.c
	new file:   multi_modem.h
	new file:   ptt.c
	new file:   ptt.h
	new file:   pttest.c
	new file:   rdq.c
	new file:   rdq.h
	new file:   redecode.c
	new file:   redecode.h
	new file:   regex/COPYING
	new file:   regex/INSTALL
	new file:   regex/LICENSES
	new file:   regex/NEWS
	new file:   regex/README
	new file:   regex/README-dire-wolf.txt
	new file:   regex/re_comp.h
	new file:   regex/regcomp.c
	new file:   regex/regex.c
	new file:   regex/regex.h
	new file:   regex/regex_internal.c
	new file:   regex/regex_internal.h
	new file:   regex/regexec.c
	new file:   rrbb.c
	new file:   rrbb.h
	new file:   server.c
	new file:   server.h
	new file:   symbols-new.txt
	new file:   symbols.c
	new file:   symbols.h
	new file:   symbolsX.txt
	new file:   textcolor.c
	new file:   textcolor.h
	new file:   tocalls.txt
	new file:   tq.c
	new file:   tq.h
	new file:   tt_text.c
	new file:   tt_text.h
	new file:   tt_user.c
	new file:   tt_user.h
	new file:   tune.h
	new file:   udp_test.c
	new file:   utm/LatLong-UTMconversion.c
	new file:   utm/LatLong-UTMconversion.h
	new file:   utm/README.txt
	new file:   utm/SwissGrid.cpp
	new file:   utm/UTMConversions.cpp
	new file:   utm/constants.h
	new file:   utm2ll.c
	new file:   version.h
	new file:   xmit.c
	new file:   xmit.h
2015-07-26 20:35:07 -04:00

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//
// This file is part of Dire Wolf, an amateur radio packet TNC.
//
// Copyright (C) 2011,2012 John Langner, WB2OSZ
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
/*------------------------------------------------------------------
*
* Module: tq.c
*
* Purpose: Transmit queue - hold packets for transmission until the channel is clear.
*
* Description: Producers of packets to be transmitted call tq_append and then
* go merrily on their way, unconcerned about when the packet might
* actually get transmitted.
*
* Another thread waits until the channel is clear and then removes
* packets from the queue and transmits them.
*
*---------------------------------------------------------------*/
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "direwolf.h"
#include "ax25_pad.h"
#include "textcolor.h"
#include "audio.h"
#include "tq.h"
#include "dedupe.h"
static int tq_num_channels; /* Set once during intialization and */
/* should not change after that. */
static packet_t queue_head[MAX_CHANS][TQ_NUM_PRIO]; /* Head of linked list for each queue. */
#if __WIN32__
static CRITICAL_SECTION tq_cs; /* Critical section for updating queues. */
static HANDLE wake_up_event; /* Notify transmit thread when queue not empty. */
#else
static pthread_mutex_t tq_mutex; /* Critical section for updating queues. */
static pthread_cond_t wake_up_cond; /* Notify transmit thread when queue not empty. */
static pthread_mutex_t wake_up_mutex; /* Required by cond_wait. */
static int xmit_thread_is_waiting = 0;
#endif
static int tq_is_empty (void);
/*-------------------------------------------------------------------
*
* Name: tq_init
*
* Purpose: Initialize the transmit queue.
*
* Inputs: nchan - Number of communication channels.
*
* Outputs:
*
* Description: Initialize the queue to be empty and set up other
* mechanisms for sharing it between different threads.
*
* We have different timing rules for different types of
* packets so they are put into different queues.
*
* High Priority -
*
* Packets which are being digipeated go out first.
* Latest recommendations are to retransmit these
* immdediately (after no one else is heard, of course)
* rather than waiting random times to avoid collisions.
* The KPC-3 configuration option for this is "UIDWAIT OFF".
*
* Low Priority -
*
* Other packets are sent after a random wait time
* (determined by PERSIST & SLOTTIME) to help avoid
* collisions.
*
* If more than one audio channel is being used, a separate
* pair of transmit queues is used for each channel.
*
*--------------------------------------------------------------------*/
void tq_init (int nchan)
{
int c, p;
int err;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_init ( %d )\n", nchan);
#endif
tq_num_channels = nchan;
assert (tq_num_channels >= 1 && tq_num_channels <= MAX_CHANS);
for (c=0; c<MAX_CHANS; c++) {
for (p=0; p<TQ_NUM_PRIO; p++) {
queue_head[c][p] = NULL;
}
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_init: pthread_mutex_init...\n");
#endif
#if __WIN32__
InitializeCriticalSection (&tq_cs);
#else
err = pthread_mutex_init (&wake_up_mutex, NULL);
err = pthread_mutex_init (&tq_mutex, NULL);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_init: pthread_mutex_init err=%d", err);
perror ("");
exit (1);
}
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_init: pthread_cond_init...\n");
#endif
#if __WIN32__
wake_up_event = CreateEvent (NULL, 0, 0, NULL);
if (wake_up_event == NULL) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_init: pthread_cond_init: can't create transmit wake up event");
exit (1);
}
#else
err = pthread_cond_init (&wake_up_cond, NULL);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_init: pthread_cond_init returns %d\n", err);
#endif
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_init: pthread_cond_init err=%d", err);
perror ("");
exit (1);
}
xmit_thread_is_waiting = 0;
#endif
} /* end tq_init */
/*-------------------------------------------------------------------
*
* Name: tq_append
*
* Purpose: Add a packet to the end of the specified transmit queue.
*
* Inputs: chan - Channel, 0 is first.
*
* prio - Priority, use TQ_PRIO_0_HI or TQ_PRIO_1_LO.
*
* pp - Address of packet object.
* Caller should NOT make any references to
* it after this point because it could
* be deleted at any time.
*
* Outputs:
*
* Description: Add packet to end of linked list.
* Signal the transmit thread if the queue was formerly empty.
*
* IMPORTANT! Don't make an further references to the packet object after
* giving it to tq_append.
*
*--------------------------------------------------------------------*/
void tq_append (int chan, int prio, packet_t pp)
{
// int was_empty;
// int c, p;
packet_t plast;
packet_t pnext;
int err;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_append (chan=%d, prio=%d, pp=%p)\n", chan, prio, pp);
#endif
assert (tq_num_channels >= 1 && tq_num_channels <= MAX_CHANS);
assert (prio >= 0 && prio < TQ_NUM_PRIO);
if (chan < 0 || chan >= tq_num_channels) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("ERROR - Request to transmit on radio channel %d.\n", chan);
ax25_delete(pp);
return;
}
/* Is transmit queue out of control? */
if (tq_count(chan,prio) > 20) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("Transmit packet queue is too long. Discarding transmit request.\n");
dw_printf ("Perhaps the channel is so busy there is no opportunity to send.\n");
ax25_delete(pp);
return;
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_append: enter critical section\n");
#endif
#if __WIN32__
EnterCriticalSection (&tq_cs);
#else
err = pthread_mutex_lock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_append: pthread_mutex_lock err=%d", err);
perror ("");
exit (1);
}
#endif
// was_empty = 1;
// for (c=0; c<tq_num_channels; c++) {
// for (p=0; p<TQ_NUM_PRIO; p++) {
// if (queue_head[c][p] != NULL)
// was_empty = 0;
// }
// }
if (queue_head[chan][prio] == NULL) {
queue_head[chan][prio] = pp;
}
else {
plast = queue_head[chan][prio];
while ((pnext = ax25_get_nextp(plast)) != NULL) {
plast = pnext;
}
ax25_set_nextp (plast, pp);
}
#if __WIN32__
LeaveCriticalSection (&tq_cs);
#else
err = pthread_mutex_unlock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_append: pthread_mutex_unlock err=%d", err);
perror ("");
exit (1);
}
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_append: left critical section\n");
dw_printf ("tq_append (): about to wake up xmit thread.\n");
#endif
#if __WIN32__
SetEvent (wake_up_event);
#else
if (xmit_thread_is_waiting) {
err = pthread_mutex_lock (&wake_up_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_append: pthread_mutex_lock wu err=%d", err);
perror ("");
exit (1);
}
err = pthread_cond_signal (&wake_up_cond);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_append: pthread_cond_signal err=%d", err);
perror ("");
exit (1);
}
err = pthread_mutex_unlock (&wake_up_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_append: pthread_mutex_unlock wu err=%d", err);
perror ("");
exit (1);
}
}
#endif
}
/*-------------------------------------------------------------------
*
* Name: tq_wait_while_empty
*
* Purpose: Sleep while the transmit queue is empty rather than
* polling periodically.
*
* Inputs: None.
*
*--------------------------------------------------------------------*/
void tq_wait_while_empty (void)
{
int is_empty;
//int c, p;
int err;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty () : enter critical section\n");
#endif
assert (tq_num_channels >= 1 && tq_num_channels <= MAX_CHANS);
#if __WIN32__
EnterCriticalSection (&tq_cs);
#else
err = pthread_mutex_lock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_wait_while_empty: pthread_mutex_lock err=%d", err);
perror ("");
exit (1);
}
#endif
#if DEBUG
//text_color_set(DW_COLOR_DEBUG);
//dw_printf ("tq_wait_while_empty (): after pthread_mutex_lock\n");
#endif
is_empty = tq_is_empty();
#if __WIN32__
LeaveCriticalSection (&tq_cs);
#else
err = pthread_mutex_unlock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_wait_while_empty: pthread_mutex_unlock err=%d", err);
perror ("");
exit (1);
}
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty () : left critical section\n");
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty (): is_empty = %d\n", is_empty);
#endif
if (is_empty) {
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty (): SLEEP - about to call cond wait\n");
#endif
#if __WIN32__
WaitForSingleObject (wake_up_event, INFINITE);
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty (): returned from wait\n");
#endif
#else
err = pthread_mutex_lock (&wake_up_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_wait_while_empty: pthread_mutex_lock wu err=%d", err);
perror ("");
exit (1);
}
xmit_thread_is_waiting = 1;
err = pthread_cond_wait (&wake_up_cond, &wake_up_mutex);
xmit_thread_is_waiting = 0;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty (): WOKE UP - returned from cond wait, err = %d\n", err);
#endif
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_wait_while_empty: pthread_cond_wait err=%d", err);
perror ("");
exit (1);
}
err = pthread_mutex_unlock (&wake_up_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_wait_while_empty: pthread_mutex_unlock wu err=%d", err);
perror ("");
exit (1);
}
#endif
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_wait_while_empty () returns\n");
#endif
}
/*-------------------------------------------------------------------
*
* Name: tq_remove
*
* Purpose: Remove a packet from the head of the specified transmit queue.
*
* Inputs: chan - Channel, 0 is first.
*
* prio - Priority, use TQ_PRIO_0_HI or TQ_PRIO_1_LO.
*
* Returns: Pointer to packet object.
* Caller should destroy it with ax25_delete when finished with it.
*
*--------------------------------------------------------------------*/
packet_t tq_remove (int chan, int prio)
{
packet_t result_p;
int err;
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_remove(%d,%d) enter critical section\n", chan, prio);
#endif
#if __WIN32__
EnterCriticalSection (&tq_cs);
#else
err = pthread_mutex_lock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_remove: pthread_mutex_lock err=%d", err);
perror ("");
exit (1);
}
#endif
if (queue_head[chan][prio] == NULL) {
result_p = NULL;
}
else {
result_p = queue_head[chan][prio];
queue_head[chan][prio] = ax25_get_nextp(result_p);
ax25_set_nextp (result_p, NULL);
}
#if __WIN32__
LeaveCriticalSection (&tq_cs);
#else
err = pthread_mutex_unlock (&tq_mutex);
if (err != 0) {
text_color_set(DW_COLOR_ERROR);
dw_printf ("tq_remove: pthread_mutex_unlock err=%d", err);
perror ("");
exit (1);
}
#endif
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_remove(%d,%d) leave critical section, returns %p\n", chan, prio, result_p);
#endif
return (result_p);
}
/*-------------------------------------------------------------------
*
* Name: tq_is_empty
*
* Purpose: Test queue is empty.
*
* Inputs: None - this applies to all channels and priorities.
*
* Returns: True if nothing in the queue.
*
*--------------------------------------------------------------------*/
static int tq_is_empty (void)
{
int c, p;
for (c=0; c<tq_num_channels; c++) {
for (p=0; p<TQ_NUM_PRIO; p++) {
assert (c >= 0 && c < MAX_CHANS);
assert (p >= 0 && p < TQ_NUM_PRIO);
if (queue_head[c][p] != NULL)
return (0);
}
}
return (1);
} /* end tq_is_empty */
/*-------------------------------------------------------------------
*
* Name: tq_count
*
* Purpose: Return count of the number of packets in the specified transmit queue.
*
* Inputs: chan - Channel, 0 is first.
*
* prio - Priority, use TQ_PRIO_0_HI or TQ_PRIO_1_LO.
*
* Returns: Number of items in specified queue.
*
*--------------------------------------------------------------------*/
int tq_count (int chan, int prio)
{
packet_t p;
int n;
/* Don't bother with critical section. */
/* Only used for debugging a problem. */
n = 0;
p = queue_head[chan][prio];
while (p != NULL) {
n++;
p = ax25_get_nextp(p);
}
#if DEBUG
text_color_set(DW_COLOR_DEBUG);
dw_printf ("tq_count(%d,%d) returns %d\n", chan, prio, n);
#endif
return (n);
} /* end tq_count */
/* end tq.c */
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