void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock)
{
THR_LOCK_DATA *data;
DBUG_ENTER("thr_abort_locks");
mysql_mutex_lock(&lock->mutex);
for (data=lock->read_wait.data; data ; data=data->next)
{
data->type=TL_UNLOCK; /* Mark killed */
/* It's safe to signal the cond first: we're still holding the mutex. */
mysql_cond_signal(data->cond);
data->cond=0; /* Removed from list */
}
for (data=lock->write_wait.data; data ; data=data->next)
{
data->type=TL_UNLOCK;
mysql_cond_signal(data->cond);
data->cond=0;
}
lock->read_wait.last= &lock->read_wait.data;
lock->write_wait.last= &lock->write_wait.data;
lock->read_wait.data=lock->write_wait.data=0;
if (upgrade_lock && lock->write.data)
lock->write.data->type=TL_WRITE_ONLY;
mysql_mutex_unlock(&lock->mutex);
DBUG_VOID_RETURN;
}
int audit_log_buffer_write(audit_log_buffer_t *log, const char *buf, size_t len)
{
if (len > log->size)
return(1);
mysql_mutex_lock(&log->mutex);
loop:
if (log->write_pos + len < log->flush_pos + log->size)
{
size_t wrlen= min(len, log->size -
(log->write_pos % log->size));
memcpy(log->buf + (log->write_pos % log->size), buf, wrlen);
if (wrlen < len)
memcpy(log->buf, buf + wrlen, len - wrlen);
log->write_pos= log->write_pos + len;
DBUG_ASSERT(log->write_pos >= log->flush_pos);
}
else
{
if (!log->drop_if_full)
{
mysql_cond_wait(&log->flushed_cond, &log->mutex);
goto loop;
}
}
if (log->write_pos > log->flush_pos + log->size / 2)
{
mysql_cond_signal(&log->written_cond);
}
mysql_mutex_unlock(&log->mutex);
return(0);
}
my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread_id)
{
THR_LOCK_DATA *data;
my_bool found= FALSE;
DBUG_ENTER("thr_abort_locks_for_thread");
mysql_mutex_lock(&lock->mutex);
for (data= lock->read_wait.data; data ; data= data->next)
{
if (data->owner->thread_id == thread_id) /* purecov: tested */
{
DBUG_PRINT("info",("Aborting read-wait lock"));
data->type= TL_UNLOCK; /* Mark killed */
/* It's safe to signal the cond first: we're still holding the mutex. */
found= TRUE;
mysql_cond_signal(data->cond);
data->cond= 0; /* Removed from list */
if (((*data->prev)= data->next))
data->next->prev= data->prev;
else
lock->read_wait.last= data->prev;
}
}
for (data= lock->write_wait.data; data ; data= data->next)
{
if (data->owner->thread_id == thread_id) /* purecov: tested */
{
DBUG_PRINT("info",("Aborting write-wait lock"));
data->type= TL_UNLOCK;
found= TRUE;
mysql_cond_signal(data->cond);
data->cond= 0;
if (((*data->prev)= data->next))
data->next->prev= data->prev;
else
lock->write_wait.last= data->prev;
}
}
wake_up_waiters(lock);
mysql_mutex_unlock(&lock->mutex);
DBUG_RETURN(found);
}
void my_thread_end(void)
{
struct st_my_thread_var *tmp;
tmp= _my_thread_var();
#ifdef EXTRA_DEBUG_THREADS
my_message_local(INFORMATION_LEVEL, "my_thread_end(): tmp: 0x%lx "
"pthread_self: 0x%lx thread_id: %ld",
(long) tmp, (long) pthread_self(),
tmp ? (long) tmp->id : 0L);
#endif
#ifdef HAVE_PSI_INTERFACE
/*
Remove the instrumentation for this thread.
This must be done before trashing st_my_thread_var,
because the LF_HASH depends on it.
*/
PSI_THREAD_CALL(delete_current_thread)();
#endif
if (tmp && tmp->init)
{
#if !defined(DBUG_OFF)
/* tmp->dbug is allocated inside DBUG library */
if (tmp->dbug)
{
DBUG_POP();
free(tmp->dbug);
tmp->dbug=0;
}
#endif
mysql_cond_destroy(&tmp->suspend);
mysql_mutex_destroy(&tmp->mutex);
free(tmp);
/*
Decrement counter for number of running threads. We are using this
in my_thread_global_end() to wait until all threads have called
my_thread_end and thus freed all memory they have allocated in
my_thread_init() and DBUG_xxxx
*/
mysql_mutex_lock(&THR_LOCK_threads);
DBUG_ASSERT(THR_thread_count != 0);
if (--THR_thread_count == 0)
mysql_cond_signal(&THR_COND_threads);
mysql_mutex_unlock(&THR_LOCK_threads);
}
set_mysys_var(NULL);
}
static inline void free_all_read_locks(THR_LOCK *lock,
my_bool using_concurrent_insert)
{
THR_LOCK_DATA *data=lock->read_wait.data;
check_locks(lock,"before freeing read locks",1);
/* move all locks from read_wait list to read list */
(*lock->read.last)=data;
data->prev=lock->read.last;
lock->read.last=lock->read_wait.last;
/* Clear read_wait list */
lock->read_wait.last= &lock->read_wait.data;
do
{
mysql_cond_t *cond= data->cond;
if ((int) data->type == (int) TL_READ_NO_INSERT)
{
if (using_concurrent_insert)
{
/*
We can't free this lock;
Link lock away from read chain back into read_wait chain
*/
if (((*data->prev)=data->next))
data->next->prev=data->prev;
else
lock->read.last=data->prev;
*lock->read_wait.last= data;
data->prev= lock->read_wait.last;
lock->read_wait.last= &data->next;
continue;
}
lock->read_no_write_count++;
}
/* purecov: begin inspected */
DBUG_PRINT("lock",("giving read lock to thread: 0x%x",
data->owner->thread_id));
/* purecov: end */
data->cond=0; /* Mark thread free */
mysql_cond_signal(cond);
} while ((data=data->next));
*lock->read_wait.last=0;
if (!lock->read_wait.data)
lock->write_lock_count=0;
check_locks(lock,"after giving read locks",0);
}
static void wake_up_waiters(THR_LOCK *lock)
{
THR_LOCK_DATA *data;
enum thr_lock_type lock_type;
DBUG_ENTER("wake_up_waiters");
if (!lock->write.data) /* If no active write locks */
{
data=lock->write_wait.data;
if (!lock->read.data) /* If no more locks in use */
{
/* Release write-locks with TL_WRITE or TL_WRITE_ONLY priority first */
if (data &&
(data->type != TL_WRITE_LOW_PRIORITY || !lock->read_wait.data ||
lock->read_wait.data->type < TL_READ_HIGH_PRIORITY))
{
if (lock->write_lock_count++ > max_write_lock_count)
{
/* Too many write locks in a row; Release all waiting read locks */
lock->write_lock_count=0;
if (lock->read_wait.data)
{
DBUG_PRINT("info",("Freeing all read_locks because of max_write_lock_count"));
free_all_read_locks(lock,0);
goto end;
}
}
for (;;)
{
if (((*data->prev)=data->next)) /* remove from wait-list */
data->next->prev= data->prev;
else
lock->write_wait.last=data->prev;
(*lock->write.last)=data; /* Put in execute list */
data->prev=lock->write.last;
data->next=0;
lock->write.last= &data->next;
if (data->type == TL_WRITE_CONCURRENT_INSERT &&
(*lock->check_status)(data->status_param))
data->type=TL_WRITE; /* Upgrade lock */
/* purecov: begin inspected */
DBUG_PRINT("lock",("giving write lock of type %d to thread: 0x%x",
data->type, data->owner->thread_id));
/* purecov: end */
{
mysql_cond_t *cond= data->cond;
data->cond=0; /* Mark thread free */
mysql_cond_signal(cond); /* Start waiting thread */
}
if (data->type != TL_WRITE_ALLOW_WRITE ||
!lock->write_wait.data ||
lock->write_wait.data->type != TL_WRITE_ALLOW_WRITE)
break;
data=lock->write_wait.data; /* Free this too */
}
if (data->type >= TL_WRITE_LOW_PRIORITY)
goto end;
/* Release possible read locks together with the write lock */
}
if (lock->read_wait.data)
free_all_read_locks(lock,
data &&
(data->type == TL_WRITE_CONCURRENT_INSERT ||
data->type == TL_WRITE_ALLOW_WRITE));
else
{
DBUG_PRINT("lock",("No waiting read locks to free"));
}
}
else if (data &&
(lock_type= data->type) <= TL_WRITE_CONCURRENT_INSERT &&
((lock_type != TL_WRITE_CONCURRENT_INSERT &&
lock_type != TL_WRITE_ALLOW_WRITE) ||
!lock->read_no_write_count))
{
/*
For ALLOW_READ, WRITE_ALLOW_WRITE or CONCURRENT_INSERT locks
start WRITE locks together with the READ locks
*/
if (lock_type == TL_WRITE_CONCURRENT_INSERT &&
(*lock->check_status)(data->status_param))
{
data->type=TL_WRITE; /* Upgrade lock */
if (lock->read_wait.data)
free_all_read_locks(lock,0);
goto end;
}
do {
mysql_cond_t *cond= data->cond;
if (((*data->prev)=data->next)) /* remove from wait-list */
data->next->prev= data->prev;
else
lock->write_wait.last=data->prev;
(*lock->write.last)=data; /* Put in execute list */
data->prev=lock->write.last;
lock->write.last= &data->next;
data->next=0; /* Only one write lock */
data->cond=0; /* Mark thread free */
mysql_cond_signal(cond); /* Start waiting thread */
} while (lock_type == TL_WRITE_ALLOW_WRITE &&
(data=lock->write_wait.data) &&
data->type == TL_WRITE_ALLOW_WRITE);
if (lock->read_wait.data)
free_all_read_locks(lock,
(lock_type == TL_WRITE_CONCURRENT_INSERT ||
lock_type == TL_WRITE_ALLOW_WRITE));
}
else if (!data && lock->read_wait.data)
free_all_read_locks(lock,0);
}
end:
check_locks(lock, "after waking up waiters", 0);
DBUG_VOID_RETURN;
}
/*
stress test: wait on a random number of random threads.
it always succeeds (unless crashes or hangs).
*/
pthread_handler_t test_wt(void *arg)
{
int m, n, i, id, res;
struct my_rnd_struct rand;
my_thread_init();
mysql_mutex_lock(&mutex);
id= cnt++;
wt_thd_lazy_init(& thds[id].thd,
& wt_deadlock_search_depth_short, & wt_timeout_short,
& wt_deadlock_search_depth_long, & wt_timeout_long);
/* now, wait for everybody to be ready to run */
if (cnt >= THREADS)
mysql_cond_broadcast(&thread_sync);
else
while (cnt < THREADS)
mysql_cond_wait(&thread_sync, &mutex);
mysql_mutex_unlock(&mutex);
my_rnd_init(&rand, (ulong)(intptr)&m, id);
if (kill_strategy == YOUNGEST)
thds[id].thd.weight= (ulong)~my_getsystime();
if (kill_strategy == LOCKS)
thds[id].thd.weight= 0;
for (m= *(int *)arg; m ; m--)
{
WT_RESOURCE_ID resid;
int blockers[THREADS/10], j, k;
resid.value= id;
resid.type= &restype;
res= 0;
/* prepare for waiting for a random number of random threads */
for (j= n= (rnd() % THREADS)/10; !res && j >= 0; j--)
{
retry:
i= rnd() % (THREADS-1); /* pick a random thread */
if (i >= id) i++; /* with a number from 0 to THREADS-1 excluding ours */
for (k=n; k >=j; k--) /* the one we didn't pick before */
if (blockers[k] == i)
goto retry;
blockers[j]= i;
if (kill_strategy == RANDOM)
thds[id].thd.weight= rnd();
mysql_mutex_lock(& thds[i].lock);
res= wt_thd_will_wait_for(& thds[id].thd, & thds[i].thd, &resid);
mysql_mutex_unlock(& thds[i].lock);
}
if (!res)
{
mysql_mutex_lock(&lock);
res= wt_thd_cond_timedwait(& thds[id].thd, &lock);
mysql_mutex_unlock(&lock);
}
if (res)
{
mysql_mutex_lock(& thds[id].lock);
mysql_mutex_lock(&lock);
wt_thd_release_all(& thds[id].thd);
mysql_mutex_unlock(&lock);
mysql_mutex_unlock(& thds[id].lock);
if (kill_strategy == LOCKS)
thds[id].thd.weight= 0;
if (kill_strategy == YOUNGEST)
thds[id].thd.weight= (ulong)~my_getsystime();
}
else if (kill_strategy == LOCKS)
thds[id].thd.weight++;
}
mysql_mutex_lock(&mutex);
/* wait for everybody to finish */
if (!--cnt)
mysql_cond_broadcast(&thread_sync);
else
while (cnt)
mysql_cond_wait(&thread_sync, &mutex);
mysql_mutex_lock(& thds[id].lock);
mysql_mutex_lock(&lock);
wt_thd_release_all(& thds[id].thd);
mysql_mutex_unlock(&lock);
mysql_mutex_unlock(& thds[id].lock);
wt_thd_destroy(& thds[id].thd);
if (!--running_threads) /* now, signal when everybody is done with deinit */
mysql_cond_signal(&cond);
mysql_mutex_unlock(&mutex);
DBUG_PRINT("wt", ("exiting"));
my_thread_end();
return 0;
}