C++ schedule_timeout_uninterruptible函数代码示例

/* wait until all locks are released */
void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
{
	int max_count = 5 * HZ;

	if (atomic_read(lockp) < 0) {
;
		return;
	}
	while (atomic_read(lockp) > 0) {
		if (max_count == 0) {
;
			break;
		}
		schedule_timeout_uninterruptible(1);
		max_count--;
	}
}

/* wait until all locks are released */
void snd_use_lock_sync_helper(snd_use_lock_t *lockp, const char *file, int line)
{
	int max_count = 5 * HZ;

	if (atomic_read(lockp) < 0) {
		printk(KERN_WARNING "seq_lock: lock trouble [counter = %d] in %s:%d\n", atomic_read(lockp), file, line);
		return;
	}
	while (atomic_read(lockp) > 0) {
		if (max_count == 0) {
			snd_printk(KERN_WARNING "seq_lock: timeout [%d left] in %s:%d\n", atomic_read(lockp), file, line);
			break;
		}
		schedule_timeout_uninterruptible(1);
		max_count--;
	}
}

struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
{
	struct svc_rdma_op_ctxt *ctxt;

	while (1) {
		ctxt = kmem_cache_alloc(svc_rdma_ctxt_cachep, GFP_KERNEL);
		if (ctxt)
			break;
		schedule_timeout_uninterruptible(msecs_to_jiffies(500));
	}
	ctxt->xprt = xprt;
	INIT_LIST_HEAD(&ctxt->dto_q);
	ctxt->count = 0;
	ctxt->frmr = NULL;
	atomic_inc(&xprt->sc_ctxt_used);
	return ctxt;
}

/*
 * Set current time and date in RTC
 */
static int wm8350_rtc_settime(struct device *dev, struct rtc_time *tm)
{
	struct wm8350 *wm8350 = dev_get_drvdata(dev);
	u16 time[4];
	u16 rtc_ctrl;
	int ret, retries = WM8350_SET_TIME_RETRIES;

	time[0] = tm->tm_sec;
	time[0] |= tm->tm_min << WM8350_RTC_MINS_SHIFT;
	time[1] = tm->tm_hour;
	time[1] |= (tm->tm_wday + 1) << WM8350_RTC_DAY_SHIFT;
	time[2] = tm->tm_mday;
	time[2] |= (tm->tm_mon + 1) << WM8350_RTC_MTH_SHIFT;
	time[3] = ((tm->tm_year + 1900) / 100) << WM8350_RTC_YHUNDREDS_SHIFT;
	time[3] |= (tm->tm_year + 1900) % 100;

	dev_dbg(dev, "Setting: %04x %04x %04x %04x\n",
		time[0], time[1], time[2], time[3]);

	/* Set RTC_SET to stop the clock */
	ret = wm8350_set_bits(wm8350, WM8350_RTC_TIME_CONTROL, WM8350_RTC_SET);
	if (ret < 0)
		return ret;

	/* Wait until confirmation of stopping */
	do {
		rtc_ctrl = wm8350_reg_read(wm8350, WM8350_RTC_TIME_CONTROL);
		schedule_timeout_uninterruptible(msecs_to_jiffies(1));
	} while (--retries && !(rtc_ctrl & WM8350_RTC_STS));

	if (!retries) {
		dev_err(dev, "timed out on set confirmation\n");
		return -EIO;
	}

	/* Write time to RTC */
	ret = wm8350_block_write(wm8350, WM8350_RTC_SECONDS_MINUTES, 4, time);
	if (ret < 0)
		return ret;

	/* Clear RTC_SET to start the clock */
	ret = wm8350_clear_bits(wm8350, WM8350_RTC_TIME_CONTROL,
				WM8350_RTC_SET);
	return ret;
}

static int ams_i2c_cmd(enum ams_i2c_cmd cmd)
{
	s32 result;
	int count = 3;

	ams_i2c_write(AMS_COMMAND, cmd);
	msleep(5);

	while (count--) {
		result = ams_i2c_read(AMS_COMMAND);
		if (result == 0 || result & 0x80)
			return 0;

		schedule_timeout_uninterruptible(HZ / 20);
	}

	return -1;
}

/* prcmu resout1 pin is used for CG2900 reset*/
void dcg2900_u5500_enable_chip(struct cg2900_chip_dev *dev)
{
    struct dcg2900_info *info = dev->b_data;

    clk_enable(info->lpoclk);
    /*
     * Due to a bug in CG2900 we cannot just set GPIO high to enable
     * the chip. We must wait more than 100 msecs before enbling the
     * chip.
     * - Set PDB to low.
     * - Wait for 100 msecs
     * - Set PDB to high.
     */
    prcmu_resetout(1, 0);
    schedule_timeout_uninterruptible(msecs_to_jiffies(
                                         CHIP_ENABLE_PDB_LOW_TIMEOUT));
    prcmu_resetout(1, 1);
}

unsigned int ucb1400_adc_read(struct snd_ac97 *ac97, u16 adc_channel,
		int adcsync)
{
	unsigned int val;

	if (adcsync)
		adc_channel |= UCB_ADC_SYNC_ENA;

	ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
	ucb1400_reg_write(ac97, UCB_ADC_CR, UCB_ADC_ENA | adc_channel |
			UCB_ADC_START);

	while (!((val = ucb1400_reg_read(ac97, UCB_ADC_DATA))
				& UCB_ADC_DAT_VALID))
		schedule_timeout_uninterruptible(1);

	return val & UCB_ADC_DAT_MASK;
}

int autofs4_expire_wait(struct dentry *dentry, int rcu_walk)
{
	struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
	struct autofs_info *ino = autofs4_dentry_ino(dentry);
	int status;
	int state;

	/* Block on any pending expire */
	if (!(ino->flags & AUTOFS_INF_WANT_EXPIRE))
		return 0;
	if (rcu_walk)
		return -ECHILD;

retry:
	spin_lock(&sbi->fs_lock);
	state = ino->flags & (AUTOFS_INF_WANT_EXPIRE | AUTOFS_INF_EXPIRING);
	if (state == AUTOFS_INF_WANT_EXPIRE) {
		spin_unlock(&sbi->fs_lock);
		/*
		 * Possibly being selected for expire, wait until
		 * it's selected or not.
		 */
		schedule_timeout_uninterruptible(HZ/10);
		goto retry;
	}
	if (state & AUTOFS_INF_EXPIRING) {
		spin_unlock(&sbi->fs_lock);

		pr_debug("waiting for expire %p name=%pd\n", dentry, dentry);

		status = autofs4_wait(sbi, dentry, NFY_NONE);
		wait_for_completion(&ino->expire_complete);

		pr_debug("expire done status=%d\n", status);

		if (d_unhashed(dentry))
			return -EAGAIN;

		return status;
	}
	spin_unlock(&sbi->fs_lock);

	return 0;
}

/*
 * Wait for the host to return its start-up acknowledgement
 * sequence. This wait is too long for us to perform
 * "busy-waiting", and so we must sleep. This in turn means
 * that we must not be holding any spinlocks when we call
 * this function.
 */
static int host_startup_ack(struct soundscape *s, unsigned timeout)
{
	while (timeout != 0) {
		unsigned long flags;
		unsigned char x;

		schedule_timeout_uninterruptible(1);

		spin_lock_irqsave(&s->lock, flags);
		x = inb(HOST_DATA_IO(s->io_base));
		spin_unlock_irqrestore(&s->lock, flags);
		if (x == 0xfe)
			return 1;

		--timeout;
	} /* while */

	return 0;
}

int snd_seq_pool_done(struct snd_seq_pool *pool)
{
	unsigned long flags;
	struct snd_seq_event_cell *ptr;
	int max_count = 5 * HZ;

	if (snd_BUG_ON(!pool))
		return -EINVAL;

	
	spin_lock_irqsave(&pool->lock, flags);
	pool->closing = 1;
	spin_unlock_irqrestore(&pool->lock, flags);

	if (waitqueue_active(&pool->output_sleep))
		wake_up(&pool->output_sleep);

	while (atomic_read(&pool->counter) > 0) {
		if (max_count == 0) {
			snd_printk(KERN_WARNING "snd_seq_pool_done timeout: %d cells remain\n", atomic_read(&pool->counter));
			break;
		}
		schedule_timeout_uninterruptible(1);
		max_count--;
	}
	
	
	spin_lock_irqsave(&pool->lock, flags);
	ptr = pool->ptr;
	pool->ptr = NULL;
	pool->free = NULL;
	pool->total_elements = 0;
	spin_unlock_irqrestore(&pool->lock, flags);

	vfree(ptr);

	spin_lock_irqsave(&pool->lock, flags);
	pool->closing = 0;
	spin_unlock_irqrestore(&pool->lock, flags);

	return 0;
}

static int snd_ali_stimer_ready(struct snd_ali *codec)
{
	unsigned long end_time;
	unsigned long dwChk1,dwChk2;
	
	dwChk1 = snd_ali_5451_peek(codec, ALI_STIMER);
	end_time = jiffies + msecs_to_jiffies(250);

	for (;;) {
		dwChk2 = snd_ali_5451_peek(codec, ALI_STIMER);
		if (dwChk2 != dwChk1)
			return 0;
		if (!time_after_eq(end_time, jiffies))
			break;
		schedule_timeout_uninterruptible(1);
	}

	dev_err(codec->card->dev, "ali_stimer_read: stimer is not ready.\n");
	return -EIO;
}

static unsigned int ucb1400_adc_read(struct ucb1400 *ucb, u16 adc_channel)
{
	unsigned int val;

	if (ucb->adcsync)
		adc_channel |= UCB_ADC_SYNC_ENA;

	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel);
	ucb1400_reg_write(ucb, UCB_ADC_CR, UCB_ADC_ENA | adc_channel | UCB_ADC_START);

	for (;;) {
		val = ucb1400_reg_read(ucb, UCB_ADC_DATA);
		if (val & UCB_ADC_DAT_VALID)
			break;
		/* yield to other processes */
		schedule_timeout_uninterruptible(1);
	}

	return UCB_ADC_DAT_VALUE(val);
}

static int snd_ali_codec_ready(struct snd_ali *codec,
			       unsigned int port)
{
	unsigned long end_time;
	unsigned int res;
	
	end_time = jiffies + msecs_to_jiffies(250);

	for (;;) {
		res = snd_ali_5451_peek(codec,port);
		if (!(res & 0x8000))
			return 0;
		if (!time_after_eq(end_time, jiffies))
			break;
		schedule_timeout_uninterruptible(1);
	}

	snd_ali_5451_poke(codec, port, res & ~0x8000);
	dev_dbg(codec->card->dev, "ali_codec_ready: codec is not ready.\n ");
	return -EIO;
}

static int falcon_spi_wait(struct efx_nic *efx)
{
	unsigned long timeout = jiffies + 1 + DIV_ROUND_UP(HZ, 10);
	int i;

	for (i = 0; i < 10; i++) {
		if (!falcon_spi_poll(efx))
			return 0;
		udelay(10);
	}

	for (;;) {
		if (!falcon_spi_poll(efx))
			return 0;
		if (time_after_eq(jiffies, timeout)) {
			netif_err(efx, hw, efx->net_dev,
				  "timed out waiting for SPI\n");
			return -ETIMEDOUT;
		}
		schedule_timeout_uninterruptible(1);
	}
}

int lio_wait_for_clean_oq(struct octeon_device *oct)
{
	int retry = 100, pending_pkts = 0;
	int idx;

	do {
		pending_pkts = 0;

		for (idx = 0; idx < MAX_OCTEON_OUTPUT_QUEUES(oct); idx++) {
			if (!(oct->io_qmask.oq & BIT_ULL(idx)))
				continue;
			pending_pkts +=
				atomic_read(&oct->droq[idx]->pkts_pending);
		}

		if (pending_pkts > 0)
			schedule_timeout_uninterruptible(1);

	} while (retry-- && pending_pkts);

	return pending_pkts;
}