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Fix race in DISCONNECT vs RELEASE 

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@881 f38db490-d61c-443f-a65b-d21fe96a405b
This commit is contained in:
markster 2003-04-22 18:47:49 +00:00
parent 445d8da0c0
commit 19fd95eb01
1 changed files with 28 additions and 16 deletions
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44
channels/chan_zap.c
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@ -295,18 +295,6 @@ static int pritype = PRI_CPE;
#define DEFAULT_PRI_DEBUG 0
#endif
static inline int pri_grab(struct zt_pri *pri)
{
int res;
/* Grab the lock first */
res = ast_pthread_mutex_lock(&pri->lock);
if (res)
return res;
/* Then break the select */
pthread_kill(pri->master, SIGURG);
return 0;
}
static inline void pri_rel(struct zt_pri *pri)
{
ast_pthread_mutex_unlock(&pri->lock);
@ -459,6 +447,26 @@ static struct zt_pvt {
#endif
} *iflist = NULL;
#ifdef ZAPATA_PRI
static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
{
int res;
/* Grab the lock first */
do {
res = pthread_mutex_trylock(&pri->lock);
if (res) {
ast_pthread_mutex_unlock(&pvt->lock);
/* Release the lock and try again */
usleep(1);
ast_pthread_mutex_lock(&pvt->lock);
}
} while(res);
/* Then break the select */
pthread_kill(pri->master, SIGURG);
return 0;
}
#endif
static struct zt_ring_cadence cadences[] = {
{ { 125, 125, 2000, 4000 } }, /* Quick chirp followed by normal ring */
{ { 250, 250, 500, 1000, 250, 250, 500, 4000 } }, /* British style ring */
@ -1578,7 +1586,7 @@ static int zt_hangup(struct ast_channel *ast)
#ifdef ZAPATA_PRI
if (p->sig == SIG_PRI) {
if (p->call) {
if (!pri_grab(p->pri)) {
if (!pri_grab(p, p->pri)) {
res = pri_disconnect(p->pri->pri, p->call, PRI_CAUSE_NORMAL_CLEARING);
if (p->alreadyhungup) {
p->call = NULL;
@ -1688,12 +1696,15 @@ static int zt_answer(struct ast_channel *ast)
int index;
int oldstate = ast->_state;
ast_setstate(ast, AST_STATE_UP);
ast_pthread_mutex_lock(&p->lock);
index = zt_get_index(ast, p, 0);
if (index < 0)
index = SUB_REAL;
/* nothing to do if a radio channel */
if (p->radio)
if (p->radio) {
ast_pthread_mutex_unlock(&p->lock);
return 0;
}
switch(p->sig) {
case SIG_FXSLS:
case SIG_FXSGS:
@ -1730,7 +1741,7 @@ static int zt_answer(struct ast_channel *ast)
#ifdef ZAPATA_PRI
case SIG_PRI:
/* Send a pri acknowledge */
if (!pri_grab(p->pri)) {
if (!pri_grab(p, p->pri)) {
res = pri_answer(p->pri->pri, p->call, 0, 1);
pri_rel(p->pri);
} else {
@ -1750,8 +1761,9 @@ static int zt_answer(struct ast_channel *ast)
return 0;
default:
ast_log(LOG_WARNING, "Don't know how to answer signalling %d (channel %d)\n", p->sig, p->channel);
return -1;
res = -1;
}
ast_pthread_mutex_unlock(&p->lock);
return res;
}