/** Unlock mutex.
*
* Thread cancellation is enabled again after the mutex is properly unlocked.
*/
PaError PaUnixMutex_Unlock( PaUnixMutex* self )
{
PaError result = paNoError;
int oldState;
PA_ENSURE_SYSTEM( pthread_mutex_unlock( &self->mtx ), 0 );
PA_ENSURE_SYSTEM( pthread_setcancelstate( PTHREAD_CANCEL_ENABLE, &oldState ), 0 );
error:
return result;
}
PaError PaUnixThread_Terminate( PaUnixThread* self, int wait, PaError* exitResult )
{
PaError result = paNoError;
void* pret;
if( exitResult )
{
*exitResult = paNoError;
}
#if 0
if( watchdogExitResult )
*watchdogExitResult = paNoError;
if( th->watchdogRunning )
{
pthread_cancel( th->watchdogThread );
PA_ENSURE_SYSTEM( pthread_join( th->watchdogThread, &pret ), 0 );
if( pret && pret != PTHREAD_CANCELED )
{
if( watchdogExitResult )
*watchdogExitResult = *(PaError *) pret;
free( pret );
}
}
#endif
/* Only kill the thread if it isn't in the process of stopping (flushing adaptation buffers) */
/* TODO: Make join time out */
self->stopRequested = wait;
if( !wait )
{
PA_DEBUG(( "%s: Canceling thread %d\n", __FUNCTION__, self->thread ));
/* XXX: Safe to call this if the thread has exited on its own? */
pthread_cancel( self->thread );
}
PA_DEBUG(( "%s: Joining thread %d\n", __FUNCTION__, self->thread ));
PA_ENSURE_SYSTEM( pthread_join( self->thread, &pret ), 0 );
if( pret && PTHREAD_CANCELED != pret )
{
if( exitResult )
{
*exitResult = *(PaError*)pret;
}
free( pret );
}
error:
PA_ASSERT_CALL( PaUnixMutex_Terminate( &self->mtx ), paNoError );
PA_ASSERT_CALL( pthread_cond_destroy( &self->cond ), 0 );
return result;
}
/** Lock mutex.
*
* We're disabling thread cancellation while the thread is holding a lock, so mutexes are
* properly unlocked at termination time.
*/
PaError PaUnixMutex_Lock( PaUnixMutex* self )
{
PaError result = paNoError;
#ifdef PTHREAD_CANCEL
int oldState;
PA_ENSURE_SYSTEM( pthread_setcancelstate( PTHREAD_CANCEL_DISABLE, &oldState ), 0 );
#endif
PA_ENSURE_SYSTEM( pthread_mutex_lock( &self->mtx ), 0 );
error:
return result;
}
PaError PaUnixThread_New( PaUnixThread* self, void* (*threadFunc)( void* ), void* threadArg, PaTime waitForChild,
int rtSched )
{
PaError result = paNoError;
pthread_attr_t attr;
int started = 0;
memset( self, 0, sizeof (PaUnixThread) );
PaUnixMutex_Initialize( &self->mtx );
PA_ASSERT_CALL( pthread_cond_init( &self->cond, NULL ), 0 );
self->parentWaiting = 0 != waitForChild;
/* Spawn thread */
/* Temporarily disabled since we should test during configuration for presence of required mman.h header */
#if 0
#if defined _POSIX_MEMLOCK && (_POSIX_MEMLOCK != -1)
if( rtSched )
{
if( mlockall( MCL_CURRENT | MCL_FUTURE ) < 0 )
{
int savedErrno = errno; /* In case errno gets overwritten */
assert( savedErrno != EINVAL ); /* Most likely a programmer error */
PA_UNLESS( (savedErrno == EPERM), paInternalError );
PA_DEBUG(( "%s: Failed locking memory\n", __FUNCTION__ ));
}
else
PA_DEBUG(( "%s: Successfully locked memory\n", __FUNCTION__ ));
}
#endif
#endif
PA_UNLESS( !pthread_attr_init( &attr ), paInternalError );
/* Priority relative to other processes */
PA_UNLESS( !pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM ), paInternalError );
PA_UNLESS( !pthread_create( &self->thread, &attr, threadFunc, threadArg ), paInternalError );
started = 1;
if( rtSched )
{
#if 0
if( self->useWatchdog )
{
int err;
struct sched_param wdSpm = { 0 };
/* Launch watchdog, watchdog sets callback thread priority */
int prio = PA_MIN( self->rtPrio + 4, sched_get_priority_max( SCHED_FIFO ) );
wdSpm.sched_priority = prio;
PA_UNLESS( !pthread_attr_init( &attr ), paInternalError );
PA_UNLESS( !pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED ), paInternalError );
PA_UNLESS( !pthread_attr_setscope( &attr, PTHREAD_SCOPE_SYSTEM ), paInternalError );
PA_UNLESS( !pthread_attr_setschedpolicy( &attr, SCHED_FIFO ), paInternalError );
PA_UNLESS( !pthread_attr_setschedparam( &attr, &wdSpm ), paInternalError );
if( (err = pthread_create( &self->watchdogThread, &attr, &WatchdogFunc, self )) )
{
PA_UNLESS( err == EPERM, paInternalError );
/* Permission error, go on without realtime privileges */
PA_DEBUG(( "Failed bumping priority\n" ));
}
else
{
int policy;
self->watchdogRunning = 1;
PA_ENSURE_SYSTEM( pthread_getschedparam( self->watchdogThread, &policy, &wdSpm ), 0 );
/* Check if priority is right, policy could potentially differ from SCHED_FIFO (but that's alright) */
if( wdSpm.sched_priority != prio )
{
PA_DEBUG(( "Watchdog priority not set correctly (%d)\n", wdSpm.sched_priority ));
PA_ENSURE( paInternalError );
}
}
}
else
#endif
PA_ENSURE( BoostPriority( self ) );
{
int policy;
struct sched_param spm;
pthread_getschedparam(self->thread, &policy, &spm);
}
}
if( self->parentWaiting )
{
PaTime till;
struct timespec ts;
int res = 0;
PaTime now;
PA_ENSURE( PaUnixMutex_Lock( &self->mtx ) );
/* Wait for stream to be started */
now = PaUtil_GetTime();
till = now + waitForChild;
while( self->parentWaiting && !res )
{
if( waitForChild > 0 )
{
ts.tv_sec = (time_t) floor( till );
ts.tv_nsec = (long) ((till - floor( till )) * 1e9);
res = pthread_cond_timedwait( &self->cond, &self->mtx.mtx, &ts );
}
else
{
res = pthread_cond_wait( &self->cond, &self->mtx.mtx );
}
}
PA_ENSURE( PaUnixMutex_Unlock( &self->mtx ) );
PA_UNLESS( !res || ETIMEDOUT == res, paInternalError );
PA_DEBUG(( "%s: Waited for %g seconds for stream to start\n", __FUNCTION__, PaUtil_GetTime() - now ));
if( ETIMEDOUT == res )
{
PA_ENSURE( paTimedOut );
}
}
end:
return result;
error:
if( started )
{
PaUnixThread_Terminate( self, 0, NULL );
}
goto end;
}