static int __init __atomic_init(void)
{
__atomic_t a;
printk("testing ldrex, strex....\n");
__atomic_add(1, &a);
__atomic_add_fail(1, &a);
printk("tested ldrex, strex\n");
__atomic_add_hang(1, &a);
printk("never arrive here\n");
return 0;
}
static int32_t os2_mixer_event(uint32_t ulStatus, PMCI_MIX_BUFFER pBuffer,
uint32_t ulFlags)
{
sa_stream_t * s;
/* check for errors */
if (ulFlags & MIX_STREAM_ERROR)
os2_error(0, "os2_mixer_event", "MIX_STREAM_ERROR - status=", ulStatus);
if (!(ulFlags & MIX_WRITE_COMPLETE))
return os2_error(TRUE, "os2_mixer_event",
"unexpected event - flag=", ulFlags);
if (!pBuffer || !pBuffer->ulUserParm)
return os2_error(TRUE, "os2_mixer_event", "null pointer", 0);
/* Note: this thread doesn't use a mutex to avoid a deadlock with the one
* DART uses to prevent MCI operations while this function is running */
s = (sa_stream_t *)pBuffer->ulUserParm;
/* update the number of buffers that are now in use */
s->usedCnt += __atomic_xchg(&s->usedNew, 0);
s->usedCnt--;
/* if fewer than 2 buffers are in use, enter recovery mode -
* if we wait until they're all free, it's often too late; */
if (s->usedCnt < s->usedMin) {
s->playing = FALSE;
os2_pause_device(s->hwDeviceID, FALSE);
os2_error(0, "os2_mixer_event",
"too few buffers in use - recovering", 0);
}
/* pass the number of newly played bytes to the other thread;
* get the time so the other thread can estimate how many
* additional bytes have been consumed since this event */
__atomic_add(&s->writeNew, pBuffer->ulBufferLength);
pBuffer->ulBufferLength = 0;
DosQuerySysInfo(QSV_MS_COUNT, QSV_MS_COUNT,
(void*)&s->writeTime, sizeof(s->writeTime));
/* signal the decode thread that a buffer is available */
__atomic_increment(&s->freeNew);
return TRUE;
}
void operator++()
{
__atomic_add(&value_, 1);
}
static int __decrement_if_positive( volatile int *dest )
{
if( *dest > 0 )
return( __atomic_add( dest, -1 ) <= 0 );
return( 0 );
}
