C++ ATOMIC_INIT函数代码示例

};

static unsigned char key_val;

// interrupt flag, interrupt server function set it 1, key_int_drv_read clear it
static volatile int ev_press = 0;

static struct fasync_struct *button_async;


static DECLARE_WAIT_QUEUE_HEAD(button_waitq);

static DECLARE_MUTEX(button_lock);

#ifdef __ATOMIC__
static atomic_t  canopen = ATOMIC_INIT(1);	//定义原子变量，并初始化为1
#endif


struct pin_desc pins_desc[4] = {
		{S3C2410_GPF0, 0x01},
			{S3C2410_GPF2, 0x02},
			{S3C2410_GPG3, 0x03},
			{S3C2410_GPG11, 0x04},
};
static irqreturn_t key_int_irq(int irq, void *dev_id)
{
	struct pin_desc *pindesc = (struct pin_desc *)dev_id;
	unsigned int pinval;

	pinval = s3c2410_gpio_getpin(pindesc->pin);

#include <mach/socinfo.h>
#include <mach/msm_subsystem_map.h>

char iommu_dummy[2*SZ_64K-4];

struct msm_iova_data {
	struct rb_node node;
	struct mem_pool *pools;
	int npools;
	struct iommu_domain *domain;
	int domain_num;
};

static struct rb_root domain_root;
DEFINE_MUTEX(domain_mutex);
static atomic_t domain_nums = ATOMIC_INIT(-1);

int msm_use_iommu()
{
	return iommu_present(&platform_bus_type);
}

int msm_iommu_map_extra(struct iommu_domain *domain,
				unsigned long start_iova,
				unsigned long size,
				unsigned long page_size,
				int cached)
{
	int ret = 0;
	int i = 0;
	unsigned long phy_addr = ALIGN(virt_to_phys(iommu_dummy), page_size);

#include <linux/clk.h>

#include <linux/proc_fs.h>
#include <asm/io.h>

#include <asm/hardware.h>
#include <asm/arch/dma.h>
#include <asm/delay.h>

#include <asm/atomic.h>

/*!
 * This variable is used to controll the clock of DMA.
 * It counts the number of actived channels
 */
static atomic_t g_dma_actived = ATOMIC_INIT(0);

/*!
 * This variable point a proc file which contains the information
 *	of DMA channels
 */
static struct proc_dir_entry *g_proc_dir;

/*!
 * The dma channels
 */
static mxc_dma_channel_t g_dma_channels[MAX_DMA_CHANNELS];
static mx2_dma_priv_t g_dma_privates[MXC_DMA_CHANNELS];
static mx2_dma_bd_t g_dma_bd_table[MXC_DMA_CHANNELS][MAX_BD_SIZE];

static DEFINE_SPINLOCK(dma_list_lock);

#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/security.h>
#include <linux/user_namespace.h>
#include <asm/uaccess.h>
#include "internal.h"

/* Session keyring create vs join semaphore */
static DEFINE_MUTEX(key_session_mutex);

/* User keyring creation semaphore */
static DEFINE_MUTEX(key_user_keyring_mutex);

/* The root user's tracking struct */
struct key_user root_key_user = {
	.usage		= ATOMIC_INIT(3),
	.cons_lock	= __MUTEX_INITIALIZER(root_key_user.cons_lock),
	.lock		= __SPIN_LOCK_UNLOCKED(root_key_user.lock),
	.nkeys		= ATOMIC_INIT(2),
	.nikeys		= ATOMIC_INIT(2),
	.uid		= 0,
	.user_ns	= &init_user_ns,
};

/*
 * Install the user and user session keyrings for the current process's UID.
 */
int install_user_keyrings(void)
{
	struct user_struct *user;
	const struct cred *cred;

int __cfs_fail_check_set(__u32 id, __u32 value, int set)
{
	static atomic_t cfs_fail_count = ATOMIC_INIT(0);

	LASSERT(!(id & CFS_FAIL_ONCE));

	if ((cfs_fail_loc & (CFS_FAILED | CFS_FAIL_ONCE)) ==
	    (CFS_FAILED | CFS_FAIL_ONCE)) {
		atomic_set(&cfs_fail_count, 0); /* paranoia */
		return 0;
	}

	/* Fail 1/cfs_fail_val times */
	if (cfs_fail_loc & CFS_FAIL_RAND) {
		if (cfs_fail_val < 2 || cfs_rand() % cfs_fail_val > 0)
			return 0;
	}

	/* Skip the first cfs_fail_val, then fail */
	if (cfs_fail_loc & CFS_FAIL_SKIP) {
		if (atomic_inc_return(&cfs_fail_count) <= cfs_fail_val)
			return 0;
	}

	/* check cfs_fail_val... */
	if (set == CFS_FAIL_LOC_VALUE) {
		if (cfs_fail_val != -1 && cfs_fail_val != value)
			return 0;
	}

	/* Fail cfs_fail_val times, overridden by FAIL_ONCE */
	if (cfs_fail_loc & CFS_FAIL_SOME &&
	    (!(cfs_fail_loc & CFS_FAIL_ONCE) || cfs_fail_val <= 1)) {
		int count = atomic_inc_return(&cfs_fail_count);

		if (count >= cfs_fail_val) {
			set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
			atomic_set(&cfs_fail_count, 0);
			/* we are lost race to increase  */
			if (count > cfs_fail_val)
				return 0;
		}
	}

	if ((set == CFS_FAIL_LOC_ORSET || set == CFS_FAIL_LOC_RESET) &&
	    (value & CFS_FAIL_ONCE))
		set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
	/* Lost race to set CFS_FAILED_BIT. */
	if (test_and_set_bit(CFS_FAILED_BIT, &cfs_fail_loc)) {
		/* If CFS_FAIL_ONCE is valid, only one process can fail,
		 * otherwise multi-process can fail at the same time. */
		if (cfs_fail_loc & CFS_FAIL_ONCE)
			return 0;
	}

	switch (set) {
		case CFS_FAIL_LOC_NOSET:
		case CFS_FAIL_LOC_VALUE:
			break;
		case CFS_FAIL_LOC_ORSET:
			cfs_fail_loc |= value & ~(CFS_FAILED | CFS_FAIL_ONCE);
			break;
		case CFS_FAIL_LOC_RESET:
			cfs_fail_loc = value;
			break;
		default:
			LASSERTF(0, "called with bad set %u\n", set);
			break;
	}

	return 1;
}

/* Random magic number */
#define SYSFS_MAGIC 0x62656572

static struct vfsmount *sysfs_mount;
struct super_block * sysfs_sb = NULL;
struct kmem_cache *sysfs_dir_cachep;

static const struct super_operations sysfs_ops = {
	.statfs		= simple_statfs,
	.drop_inode	= generic_delete_inode,
};

struct sysfs_dirent sysfs_root = {
	.s_name		= "",
	.s_count	= ATOMIC_INIT(1),
	.s_flags	= SYSFS_DIR,
	.s_mode		= S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO,
	.s_ino		= 1,
};

static int sysfs_fill_super(struct super_block *sb, void *data, int silent)
{
	struct inode *inode;
	struct dentry *root;

	sb->s_blocksize = PAGE_CACHE_SIZE;
	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
	sb->s_magic = SYSFS_MAGIC;
	sb->s_op = &sysfs_ops;
	sb->s_time_gran = 1;

#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/tick.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/kthread.h>
#include <linux/mutex.h>
#ifdef CONFIG_POWERSUSPEND
#include <linux/powersuspend.h>
#endif

#include <asm/cputime.h>

static atomic_t active_count = ATOMIC_INIT(0);
static unsigned long stored_timer_rate;

struct cpufreq_interactivex_cpuinfo {
	struct timer_list cpu_timer;
	int timer_idlecancel;
	u64 time_in_idle;
	u64 idle_exit_time;
	u64 timer_run_time;
	int idling;
	u64 target_set_time;
	u64 target_set_time_in_idle;
	struct cpufreq_policy *policy;
	struct cpufreq_frequency_table *freq_table;
	unsigned int target_freq;
	int governor_enabled;

 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/cpuidle.h>
#include <linux/module.h>
#include <asm/cpuidle.h>
#include <asm/proc-fns.h>

#include "common.h"
#include "cpuidle.h"
#include "hardware.h"

static atomic_t master = ATOMIC_INIT(0);
static DEFINE_SPINLOCK(master_lock);

static int imx6q_enter_wait(struct cpuidle_device *dev,
			    struct cpuidle_driver *drv, int index)
{
	if (atomic_inc_return(&master) == num_online_cpus()) {
		/*
		 * With this lock, we prevent other cpu to exit and enter
		 * this function again and become the master.
		 */
		if (!spin_trylock(&master_lock))
			goto idle;
		imx6q_set_lpm(WAIT_UNCLOCKED);
		cpu_do_idle();
		imx6q_set_lpm(WAIT_CLOCKED);

 * request probing to be deferred by returning -EPROBE_DEFER from its probe hook
 *
 * Deferred probe maintains two lists of devices, a pending list and an active
 * list.  A driver returning -EPROBE_DEFER causes the device to be added to the
 * pending list.  A successful driver probe will trigger moving all devices
 * from the pending to the active list so that the workqueue will eventually
 * retry them.
 *
 * The deferred_probe_mutex must be held any time the deferred_probe_*_list
 * of the (struct device*)->p->deferred_probe pointers are manipulated
 */
static DEFINE_MUTEX(deferred_probe_mutex);
static LIST_HEAD(deferred_probe_pending_list);
static LIST_HEAD(deferred_probe_active_list);
static struct workqueue_struct *deferred_wq;
static atomic_t deferred_trigger_count = ATOMIC_INIT(0);

/**
 * deferred_probe_work_func() - Retry probing devices in the active list.
 */
static void deferred_probe_work_func(struct work_struct *work)
{
	struct device *dev;
	struct device_private *private;
	/*
	 * This block processes every device in the deferred 'active' list.
	 * Each device is removed from the active list and passed to
	 * bus_probe_device() to re-attempt the probe.  The loop continues
	 * until every device in the active list is removed and retried.
	 *
	 * Note: Once the device is removed from the list and the mutex is

static struct sk_buff *oz_build_frame(struct oz_pd *pd, struct oz_tx_frame *f);
static int oz_send_isoc_frame(struct oz_pd *pd);
static void oz_retire_frame(struct oz_pd *pd, struct oz_tx_frame *f);
static void oz_isoc_stream_free(struct oz_isoc_stream *st);
static int oz_send_next_queued_frame(struct oz_pd *pd, int more_data);
static void oz_isoc_destructor(struct sk_buff *skb);
static int oz_def_app_init(void);
static void oz_def_app_term(void);
static int oz_def_app_start(struct oz_pd *pd, int resume);
static void oz_def_app_stop(struct oz_pd *pd, int pause);
static void oz_def_app_rx(struct oz_pd *pd, struct oz_elt *elt);

/*
 * Counts the uncompleted isoc frames submitted to netcard.
 */
static atomic_t g_submitted_isoc = ATOMIC_INIT(0);

/* Application handler functions.
 */
static const struct oz_app_if g_app_if[OZ_APPID_MAX] = {
	{oz_usb_init,
	oz_usb_term,
	oz_usb_start,
	oz_usb_stop,
	oz_usb_rx,
	oz_usb_heartbeat,
	oz_usb_farewell,
	OZ_APPID_USB},

	{oz_def_app_init,
	oz_def_app_term,

{
	mpic_setup_this_cpu();
	if (cpu_has_feature(CPU_FTR_DBELL))
		doorbell_setup_this_cpu();
}

struct smp_ops_t smp_85xx_ops = {
	.kick_cpu = smp_85xx_kick_cpu,
#ifdef CONFIG_KEXEC
	.give_timebase	= smp_generic_give_timebase,
	.take_timebase	= smp_generic_take_timebase,
#endif
};

#ifdef CONFIG_KEXEC
atomic_t kexec_down_cpus = ATOMIC_INIT(0);

void mpc85xx_smp_kexec_cpu_down(int crash_shutdown, int secondary)
{
	local_irq_disable();

	if (secondary) {
		atomic_inc(&kexec_down_cpus);
		/* loop forever */
		while (1);
	}
}

static void mpc85xx_smp_kexec_down(void *arg)
{
	if (ppc_md.kexec_cpu_down)

int cx18_first_minor;

/* Callback for registering extensions */
int (*cx18_ext_init)(struct cx18 *);
EXPORT_SYMBOL(cx18_ext_init);

/* add your revision and whatnot here */
static struct pci_device_id cx18_pci_tbl[] = {
	{PCI_VENDOR_ID_CX, PCI_DEVICE_ID_CX23418,
	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{0,}
};

MODULE_DEVICE_TABLE(pci, cx18_pci_tbl);

static atomic_t cx18_instance = ATOMIC_INIT(0);

/* Parameter declarations */
static int cardtype[CX18_MAX_CARDS];
static int tuner[CX18_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1 };
static int radio[CX18_MAX_CARDS] = { -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1,
				     -1, -1, -1, -1, -1, -1, -1, -1 };
static unsigned cardtype_c = 1;
static unsigned tuner_c = 1;
static unsigned radio_c = 1;
static char pal[] = "--";

	CHARGER_INTR_OFFSET,	/* Bit 20	CHRG_CTRL		*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 21	EXT_CHRG	*/
	CHARGERFAULT_INTR_OFFSET,	/* Bit 22	INT_CHRG	*/
	RSV_INTR_OFFSET,	/* Bit 23	Reserved		*/
};

static int *twl6030_interrupt_mapping = twl6030_interrupt_mapping_table;
/*----------------------------------------------------------------------*/

static unsigned twl6030_irq_base, twl6030_irq_end;
static int twl_irq;
static bool twl_irq_wake_enabled;

static struct task_struct *task;
static struct completion irq_event;
static atomic_t twl6030_wakeirqs = ATOMIC_INIT(0);

static u8 vbatmin_hi_threshold;

static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
				   unsigned long pm_event, void *unused)
{
	int chained_wakeups;

	switch (pm_event) {
	case PM_SUSPEND_PREPARE:
		chained_wakeups = atomic_read(&twl6030_wakeirqs);

		if (chained_wakeups && !twl_irq_wake_enabled) {
			if (enable_irq_wake(twl_irq))
				pr_err("twl6030 IRQ wake enable failed\n");

static smd_channel_t *smd_channel;
static int initialized;
static wait_queue_head_t newserver_wait;
static wait_queue_head_t smd_wait;
static wait_queue_head_t init_wait;
static int smd_wait_count;	/* odd while waiting */

static DEFINE_SPINLOCK(local_endpoints_lock);
static DEFINE_SPINLOCK(remote_endpoints_lock);
static DEFINE_SPINLOCK(server_list_lock);

static struct workqueue_struct *rpcrouter_workqueue;
static struct wake_lock rpcrouter_wake_lock;
static int rpcrouter_need_len;

static atomic_t next_xid = ATOMIC_INIT(1);
static atomic_t next_mid = ATOMIC_INIT(0);

static void do_read_data(struct work_struct *work);
static void do_create_pdevs(struct work_struct *work);
static void do_create_rpcrouter_pdev(struct work_struct *work);

static DECLARE_WORK(work_read_data, do_read_data);
static DECLARE_WORK(work_create_pdevs, do_create_pdevs);
static DECLARE_WORK(work_create_rpcrouter_pdev, do_create_rpcrouter_pdev);
static atomic_t rpcrouter_pdev_created = ATOMIC_INIT(0);

#define RR_STATE_IDLE    0
#define RR_STATE_HEADER  1
#define RR_STATE_BODY    2
#define RR_STATE_ERROR   3

#include <mach/debug_mm.h>
#include <mach/custmproc.h>
#include <mach/smem_pc_oem_cmd.h>
#include <linux/sched.h>

#define DEBUG
#ifdef DEBUG
#define D(fmt, args...) printk(KERN_INFO "tid = %d: " fmt , (int)current->pid , ##args)
#else
#define D(fmt, args...) do {} while (0)
#endif

#define BUFSZ (0)

static DEFINE_MUTEX(voice_lock);
atomic_t voice_started=ATOMIC_INIT(0);

static struct audio_client *voc_tx_clnt;
static struct audio_client *voc_rx_clnt;

static int q6_voice_start(void)
{
	int rc = 0;

	mutex_lock(&voice_lock);

	if (atomic_read(&voice_started)) {
		pr_err("[%s:%s] busy\n", __MM_FILE__, __func__);
		rc = -EBUSY;
		goto done;
	}