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Merged revisions 118953 via svnmerge from

Browse Source 
https://origsvn.digium.com/svn/asterisk/branches/1.4

........
r118953 | tilghman | 2008-05-29 12:20:16 -0500 (Thu, 29 May 2008) | 3 lines

Add some debugging code that ensures that when we do deadlock avoidance, we
don't lose the information about how a lock was originally acquired.

........


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@118955 65c4cc65-6c06-0410-ace0-fbb531ad65f3
1.6.1
Tilghman Lesher 18 years ago
parent 9a535bd115
commit 6e5d843a71
7 changed files with 78 additions and 53 deletions
Show Stats Download Patch File Download Diff File

8
channels/chan_agent.c
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@ -1520,9 +1520,7 @@ static int agent_logoff(const char *agent, int soft)
ast_mutex_lock(&p->lock);
while (p->owner && ast_channel_trylock(p->owner)) {
ast_mutex_unlock(&p->lock);
usleep(1);
ast_mutex_lock(&p->lock);
DEADLOCK_AVOIDANCE(&p->lock);
}
if (p->owner) {
ast_softhangup(p->owner, AST_SOFTHANGUP_EXPLICIT);
@ -1530,9 +1528,7 @@ static int agent_logoff(const char *agent, int soft)
}
while (p->chan && ast_channel_trylock(p->chan)) {
ast_mutex_unlock(&p->lock);
usleep(1);
ast_mutex_lock(&p->lock);
DEADLOCK_AVOIDANCE(&p->lock);
}
if (p->chan) {
ast_softhangup(p->chan, AST_SOFTHANGUP_EXPLICIT);

4
channels/chan_alsa.c
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@ -297,9 +297,7 @@ static int alsa_text(struct ast_channel *c, const char *text)
static void grab_owner(void)
{
while (alsa.owner && ast_channel_trylock(alsa.owner)) {
ast_mutex_unlock(&alsalock);
usleep(1);
ast_mutex_lock(&alsalock);
DEADLOCK_AVOIDANCE(&alsalock);
}
}

28
channels/chan_iax2.c
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@ -1746,9 +1746,7 @@ static int iax2_queue_frame(int callno, struct ast_frame *f)
if (iaxs[callno] && iaxs[callno]->owner) {
if (ast_channel_trylock(iaxs[callno]->owner)) {
/* Avoid deadlock by pausing and trying again */
ast_mutex_unlock(&iaxsl[callno]);
usleep(1);
ast_mutex_lock(&iaxsl[callno]);
DEADLOCK_AVOIDANCE(&iaxsl[callno]);
} else {
ast_queue_frame(iaxs[callno]->owner, f);
ast_channel_unlock(iaxs[callno]->owner);
@ -1779,9 +1777,7 @@ static int iax2_queue_hangup(int callno)
if (iaxs[callno] && iaxs[callno]->owner) {
if (ast_channel_trylock(iaxs[callno]->owner)) {
/* Avoid deadlock by pausing and trying again */
ast_mutex_unlock(&iaxsl[callno]);
usleep(1);
ast_mutex_lock(&iaxsl[callno]);
DEADLOCK_AVOIDANCE(&iaxsl[callno]);
} else {
ast_queue_hangup(iaxs[callno]->owner);
ast_channel_unlock(iaxs[callno]->owner);
@ -1813,9 +1809,7 @@ static int iax2_queue_control_data(int callno,
if (iaxs[callno] && iaxs[callno]->owner) {
if (ast_channel_trylock(iaxs[callno]->owner)) {
/* Avoid deadlock by pausing and trying again */
ast_mutex_unlock(&iaxsl[callno]);
usleep(1);
ast_mutex_lock(&iaxsl[callno]);
DEADLOCK_AVOIDANCE(&iaxsl[callno]);
} else {
ast_queue_control_data(iaxs[callno]->owner, control, data, datalen);
ast_channel_unlock(iaxs[callno]->owner);
@ -3773,9 +3767,7 @@ static void lock_both(unsigned short callno0, unsigned short callno1)
{
ast_mutex_lock(&iaxsl[callno0]);
while (ast_mutex_trylock(&iaxsl[callno1])) {
ast_mutex_unlock(&iaxsl[callno0]);
usleep(10);
ast_mutex_lock(&iaxsl[callno0]);
DEADLOCK_AVOIDANCE(&iaxsl[callno0]);
}
}
@ -3969,9 +3961,7 @@ static int iax2_indicate(struct ast_channel *c, int condition, const void *data,
/* We don't know the remote side's call number, yet. :( */
int count = 10;
while (count-- && pvt && !pvt->peercallno) {
ast_mutex_unlock(&iaxsl[callno]);
usleep(1);
ast_mutex_lock(&iaxsl[callno]);
DEADLOCK_AVOIDANCE(&iaxsl[callno]);
pvt = iaxs[callno];
}
if (!pvt->peercallno) {
@ -8284,9 +8274,7 @@ static int socket_process(struct iax2_thread *thread)
int orignative;
retryowner:
if (ast_channel_trylock(iaxs[fr->callno]->owner)) {
ast_mutex_unlock(&iaxsl[fr->callno]);
usleep(1);
ast_mutex_lock(&iaxsl[fr->callno]);
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
if (iaxs[fr->callno] && iaxs[fr->callno]->owner) goto retryowner;
}
if (iaxs[fr->callno]) {
@ -8728,9 +8716,7 @@ retryowner:
ast_verb(3, "Format for call is %s\n", ast_getformatname(iaxs[fr->callno]->owner->nativeformats));
retryowner2:
if (ast_channel_trylock(iaxs[fr->callno]->owner)) {
ast_mutex_unlock(&iaxsl[fr->callno]);
usleep(1);
ast_mutex_lock(&iaxsl[fr->callno]);
DEADLOCK_AVOIDANCE(&iaxsl[fr->callno]);
if (iaxs[fr->callno] && iaxs[fr->callno]->owner) goto retryowner2;
}

8
channels/chan_mgcp.c
Unescape View File

@ -596,9 +596,7 @@ static void mgcp_queue_frame(struct mgcp_subchannel *sub, struct ast_frame *f)
ast_channel_unlock(sub->owner);
break;
} else {
ast_mutex_unlock(&sub->lock);
usleep(1);
ast_mutex_lock(&sub->lock);
DEADLOCK_AVOIDANCE(&sub->lock);
}
} else
break;
@ -614,9 +612,7 @@ static void mgcp_queue_hangup(struct mgcp_subchannel *sub)
ast_channel_unlock(sub->owner);
break;
} else {
ast_mutex_unlock(&sub->lock);
usleep(1);
ast_mutex_lock(&sub->lock);
DEADLOCK_AVOIDANCE(&sub->lock);
}
} else
break;

21
channels/chan_zap.c
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@ -882,10 +882,7 @@ static inline int pri_grab(struct zt_pvt *pvt, struct zt_pri *pri)
do {
res = ast_mutex_trylock(&pri->lock);
if (res) {
ast_mutex_unlock(&pvt->lock);
/* Release the lock and try again */
usleep(1);
ast_mutex_lock(&pvt->lock);
DEADLOCK_AVOIDANCE(&pvt->lock);
}
} while (res);
/* Then break the poll */
@ -976,9 +973,7 @@ static void wakeup_sub(struct zt_pvt *p, int a, void *pri)
for (;;) {
if (p->subs[a].owner) {
if (ast_channel_trylock(p->subs[a].owner)) {
ast_mutex_unlock(&p->lock);
usleep(1);
ast_mutex_lock(&p->lock);
DEADLOCK_AVOIDANCE(&p->lock);
} else {
ast_queue_frame(p->subs[a].owner, &ast_null_frame);
ast_channel_unlock(p->subs[a].owner);
@ -1025,9 +1020,7 @@ static void zap_queue_frame(struct zt_pvt *p, struct ast_frame *f, void *data)
for (;;) {
if (p->owner) {
if (ast_channel_trylock(p->owner)) {
ast_mutex_unlock(&p->lock);
usleep(1);
ast_mutex_lock(&p->lock);
DEADLOCK_AVOIDANCE(&p->lock);
} else {
ast_queue_frame(p->owner, f);
ast_channel_unlock(p->owner);
@ -3643,9 +3636,7 @@ static void zt_unlink(struct zt_pvt *slave, struct zt_pvt *master, int needlock)
ast_mutex_lock(&master->lock);
if (slave) {
while (ast_mutex_trylock(&slave->lock)) {
ast_mutex_unlock(&master->lock);
usleep(1);
ast_mutex_lock(&master->lock);
DEADLOCK_AVOIDANCE(&master->lock);
}
}
}
@ -10128,9 +10119,7 @@ static int pri_hangup_all(struct zt_pvt *p, struct zt_pri *pri)
for (x = 0; x < 3; x++) {
while (p->subs[x].owner && ast_channel_trylock(p->subs[x].owner)) {
redo++;
ast_mutex_unlock(&p->lock);
usleep(1);
ast_mutex_lock(&p->lock);
DEADLOCK_AVOIDANCE(&p->lock);
}
if (p->subs[x].owner) {
ast_queue_hangup_with_cause(p->subs[x].owner, AST_CAUSE_PRE_EMPTED);

34
include/asterisk/lock.h
Unescape View File

@ -220,7 +220,7 @@ static inline void __dump_backtrace(struct ast_bt *bt, int canlog)
{
char **strings;
size_t i;
ssize_t i;
strings = backtrace_symbols(bt->addresses, bt->num_frames);
@ -241,6 +241,38 @@ static inline void __dump_backtrace(struct ast_bt *bt, int canlog)
*/
void log_show_lock(void *this_lock_addr);
/*!
* \brief retrieve lock info for the specified mutex
*
* this gets called during deadlock avoidance, so that the information may
* be preserved as to what location originally acquired the lock.
*/
#if !defined(LOW_MEMORY)
int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, const char **func, const char **mutex_name);
#else
#define ast_find_lock_info(a,b,c,d,e) -1
#endif
/*!
* \brief Unlock a lock briefly
*
* used during deadlock avoidance, to preserve the original location where
* a lock was originally acquired.
*/
#define DEADLOCK_AVOIDANCE(lock) \
do { \
const char *__filename, *__func, *__mutex_name; \
int __lineno; \
int __res = ast_find_lock_info(lock, &__filename, &__lineno, &__func, &__mutex_name); \
ast_mutex_unlock(lock); \
usleep(1); \
if (__res < 0) { /* Shouldn't ever happen, but just in case... */ \
ast_mutex_lock(lock); \
} else { \
__ast_pthread_mutex_lock(__filename, __lineno, __func, __mutex_name, lock); \
} \
} while (0)
static void __attribute__((constructor)) init_empty_mutex(void)
{
memset(&empty_mutex, 0, sizeof(empty_mutex));

28
main/utils.c
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@ -677,6 +677,34 @@ void ast_mark_lock_failed(void *lock_addr)
#ifdef HAVE_BKTR
void ast_remove_lock_info(void *lock_addr, struct ast_bt *bt)
#else
int ast_find_lock_info(void *lock_addr, const char **filename, int *lineno, const char **func, const char **mutex_name)
{
struct thr_lock_info *lock_info;
int i = 0;
if (!(lock_info = ast_threadstorage_get(&thread_lock_info, sizeof(*lock_info))))
return -1;
pthread_mutex_lock(&lock_info->lock);
for (i = lock_info->num_locks - 1; i >= 0; i--) {
if (lock_info->locks[i].lock_addr == lock_addr)
break;
}
if (i == -1) {
/* Lock not found :( */
pthread_mutex_unlock(&lock_info->lock);
return -1;
}
*filename = lock_info->locks[i].file;
*lineno = lock_info->locks[i].line_num;
*func = lock_info->locks[i].func;
*mutex_name = lock_info->locks[i].lock_name;
return 0;
}
void ast_remove_lock_info(void *lock_addr)
#endif
{

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