C++ cv_init函数代码示例

idm_status_t
idm_conn_sm_init(idm_conn_t *ic)
{
	char taskq_name[32];

	/*
	 * Caller should have assigned a unique connection ID.  Use this
	 * connection ID to create a unique connection name string
	 */
	ASSERT(ic->ic_internal_cid != 0);
	(void) snprintf(taskq_name, sizeof (taskq_name) - 1, "conn_sm%08x",
	    ic->ic_internal_cid);

	ic->ic_state_taskq = taskq_create(taskq_name, 1, minclsyspri, 4, 16384,
	    TASKQ_PREPOPULATE);
	if (ic->ic_state_taskq == NULL) {
		return (IDM_STATUS_FAIL);
	}

	idm_sm_audit_init(&ic->ic_state_audit);
	mutex_init(&ic->ic_state_mutex, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&ic->ic_state_cv, NULL, CV_DEFAULT, NULL);

	ic->ic_state = CS_S1_FREE;
	ic->ic_last_state = CS_S1_FREE;

	return (IDM_STATUS_SUCCESS);
}

/* ARGSUSED */
static int
cnread(dev_t dev, struct uio *uio, struct cred *cred)
{
	kcondvar_t	sleep_forever;
	kmutex_t	sleep_forever_mutex;

	if (rconsvp == NULL) {
		/*
		 * Go to sleep forever.  This seems like the least
		 * harmful thing to do if there's no console.
		 * EOF might be better if we're ending up single-user
		 * mode.
		 */
		cv_init(&sleep_forever, NULL, CV_DRIVER, NULL);
		mutex_init(&sleep_forever_mutex, NULL, MUTEX_DRIVER, NULL);
		mutex_enter(&sleep_forever_mutex);
		(void) cv_wait_sig(&sleep_forever, &sleep_forever_mutex);
		mutex_exit(&sleep_forever_mutex);
		return (EIO);
	}

	if (rconsvp->v_stream != NULL)
		return (strread(rconsvp, uio, cred));
	else
		return (cdev_read(rconsdev, uio, cred));
}

int
testcall(struct lwp *l, void *uap, register_t *retval)
{
	int i;

	mutex_init(&test_mutex, MUTEX_DEFAULT, IPL_NONE);
	cv_init(&test_cv, "testcv");

	printf("test: creating threads\n");

	test_count = NTHREADS;
	test_exit = 0;

	for (i = 0; i < test_count; i++)
		kthread_create(0, KTHREAD_MPSAFE, NULL, thread1, &primes[i],
		    &test_threads[i], "thread%d", i);

	printf("test: sleeping\n");

	mutex_enter(&test_mutex);
	while (test_count != 0) {
		(void)cv_timedwait(&test_cv, &test_mutex, hz * SECONDS);
		test_exit = 1;
	}
	mutex_exit(&test_mutex);

	printf("test: finished\n");

	cv_destroy(&test_cv);
	mutex_destroy(&test_mutex);

	return 0;
}

/* ------------------------------------------------------------------------ */
int fr_loginit()
{
	int	i;

	for (i = IPL_LOGMAX; i >= 0; i--) {
		iplt[i] = NULL;
		ipll[i] = NULL;
		iplh[i] = &iplt[i];
		iplused[i] = 0;
		bzero((char *)&iplcrc[i], sizeof(iplcrc[i]));
# ifdef	IPL_SELECT
		iplog_ss[i].read_waiter = 0;
		iplog_ss[i].state = 0;
# endif
# if defined(linux) && defined(_KERNEL)
		init_waitqueue_head(iplh_linux + i);
# endif
	}

# if SOLARIS && defined(_KERNEL)
	cv_init(&iplwait, "ipl condvar", CV_DRIVER, NULL);
# endif
	MUTEX_INIT(&ipl_mutex, "ipf log mutex");

	ipl_log_init = 1;

	return 0;
}

/*
 * log_event_init - Allocate and initialize log_event data structures.
 */
void
log_event_init()
{
	mutex_init(&eventq_head_mutex, NULL, MUTEX_DEFAULT, NULL);
	mutex_init(&eventq_sent_mutex, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&log_event_cv, NULL, CV_DEFAULT, NULL);

	mutex_init(&event_qfull_mutex, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&event_qfull_cv, NULL, CV_DEFAULT, NULL);

	mutex_init(&event_pause_mutex, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&event_pause_cv, NULL, CV_DEFAULT, NULL);

	mutex_init(&registered_channel_mutex, NULL, MUTEX_DEFAULT, NULL);
	sysevent_evc_init();
}

/*
 * Completion API
 */
void
init_completion(struct completion *c)
{
	cv_init(&c->cv, "VCHI completion cv");
	mtx_init(&c->lock, "VCHI completion lock", "condvar", MTX_DEF);
	c->done = 0;
}

static dsl_pool_t *
dsl_pool_open_impl(spa_t *spa, uint64_t txg)
{
	dsl_pool_t *dp;
	blkptr_t *bp = spa_get_rootblkptr(spa);

	dp = kmem_zalloc(sizeof (dsl_pool_t), KM_SLEEP);
	dp->dp_spa = spa;
	dp->dp_meta_rootbp = *bp;
	rrw_init(&dp->dp_config_rwlock, B_TRUE);
	txg_init(dp, txg);

	txg_list_create(&dp->dp_dirty_datasets,
	    offsetof(dsl_dataset_t, ds_dirty_link));
	txg_list_create(&dp->dp_dirty_zilogs,
	    offsetof(zilog_t, zl_dirty_link));
	txg_list_create(&dp->dp_dirty_dirs,
	    offsetof(dsl_dir_t, dd_dirty_link));
	txg_list_create(&dp->dp_sync_tasks,
	    offsetof(dsl_sync_task_t, dst_node));

	mutex_init(&dp->dp_lock, NULL, MUTEX_DEFAULT, NULL);
	cv_init(&dp->dp_spaceavail_cv, NULL, CV_DEFAULT, NULL);

	dp->dp_vnrele_taskq = taskq_create("zfs_vn_rele_taskq", 1, minclsyspri,
	    1, 4, 0);

	return (dp);
}

/*
 * allocate and init a scsipi_periph structure for a new device.
 */
struct scsipi_periph *
scsipi_alloc_periph(int malloc_flag)
{
    struct scsipi_periph *periph;
    u_int i;

    periph = malloc(sizeof(*periph), M_DEVBUF, malloc_flag|M_ZERO);
    if (periph == NULL)
        return NULL;

    periph->periph_dev = NULL;

    /*
     * Start with one command opening.  The periph driver
     * will grow this if it knows it can take advantage of it.
     */
    periph->periph_openings = 1;
    periph->periph_active = 0;

    for (i = 0; i < PERIPH_NTAGWORDS; i++)
        periph->periph_freetags[i] = 0xffffffff;

    TAILQ_INIT(&periph->periph_xferq);
    callout_init(&periph->periph_callout, 0);
    cv_init(&periph->periph_cv, "periph");

    return periph;
}

/* Get and initialize event structure corresponding to lwp event (i.e. address)
 * */
static afs_event_t *
afs_getevent(char *event)
{
    afs_event_t *evp, *newp = 0;
    int hashcode;

    AFS_ASSERT_GLOCK();
    hashcode = afs_evhash(event);
    evp = afs_evhasht[hashcode];
    while (evp) {
	if (evp->event == event) {
	    evp->refcount++;
	    return evp;
	}
	if (evp->refcount == 0)
	    newp = evp;
	evp = evp->next;
    }
    if (!newp) {
	newp = osi_AllocSmallSpace(sizeof(afs_event_t));
	afs_evhashcnt++;
	newp->next = afs_evhasht[hashcode];
	afs_evhasht[hashcode] = newp;
	cv_init(&newp->cond, "event cond var", CV_DEFAULT, NULL);
	newp->seq = 0;
    }
    newp->event = event;
    newp->refcount = 1;
    return newp;
}

int
smb_t2_init(struct smb_t2rq *t2p, struct smb_connobj *source, ushort_t *setup,
	int setupcnt, struct smb_cred *scred)
{
	int i;
	int error;

	bzero(t2p, sizeof (*t2p));
	mutex_init(&t2p->t2_lock, NULL, MUTEX_DRIVER, NULL);
	cv_init(&t2p->t2_cond, NULL, CV_DEFAULT, NULL);

	t2p->t2_source = source;
	t2p->t2_setupcount = (u_int16_t)setupcnt;
	t2p->t2_setupdata = t2p->t2_setup;
	for (i = 0; i < setupcnt; i++)
		t2p->t2_setup[i] = setup[i];
	t2p->t2_fid = 0xffff;
	t2p->t2_cred = scred;
	t2p->t2_share = (source->co_level == SMBL_SHARE ?
	    CPTOSS(source) : NULL); /* for smb up/down */
	error = smb_rq_getenv(source, &t2p->t2_vc, NULL);
	if (error)
		return (error);
	return (0);
}

void
HgfsInitRequestList(HgfsSuperInfo *sip) // IN: Pointer to superinfo structure
{
   int i;

   DEBUG(VM_DEBUG_REQUEST, "HgfsInitRequestList().\n");

   ASSERT(sip);

   mutex_init(&sip->reqMutex, NULL, MUTEX_DRIVER, NULL);

   /* Initialize free request list */
   DblLnkLst_Init(&sip->reqFreeList);
   mutex_init(&sip->reqFreeMutex, NULL, MUTEX_DRIVER, NULL);
   cv_init(&sip->reqFreeCondVar, NULL, CV_DRIVER, NULL);

   /*
    * Initialize pool of requests
    *
    * Here we are setting each request's id to its index into the requestPool
    * so this can be used as an identifier in reply packets.  Each request's
    * state is also set to UNUSED and is added to the free list.
    */
   for (i = 0; i < ARRAYSIZE(requestPool); i++) {
      requestPool[i].id = i;
      requestPool[i].state = HGFS_REQ_UNUSED;

      DblLnkLst_Init(&requestPool[i].listNode);
      DblLnkLst_LinkLast(&sip->reqFreeList, &requestPool[i].listNode);
   }

   //HgfsDebugPrintReqList(&sip->reqFreeList);
   DEBUG(VM_DEBUG_REQUEST, "HgfsInitRequestList() done.\n");
}

int
smb_rq_init(struct smb_rq *rqp, struct smb_connobj *co, uchar_t cmd,
	struct smb_cred *scred)
{
	int error;

	bzero(rqp, sizeof (*rqp));
	mutex_init(&rqp->sr_lock, NULL,  MUTEX_DRIVER, NULL);
	cv_init(&rqp->sr_cond, NULL, CV_DEFAULT, NULL);

	error = smb_rq_getenv(co, &rqp->sr_vc, &rqp->sr_share);
	if (error)
		return (error);

	/*
	 * We copied a VC pointer (vcp) into rqp->sr_vc,
	 * but we do NOT do a smb_vc_hold here.  Instead,
	 * the caller is responsible for the hold on the
	 * share or the VC as needed.  For smbfs callers,
	 * the hold is on the share, via the smbfs mount.
	 * For nsmb ioctl callers, the hold is done when
	 * the driver handle gets VC or share references.
	 * This design avoids frequent hold/rele activity
	 * when creating and completing requests.
	 */

	rqp->sr_rexmit = SMBMAXRESTARTS;
	rqp->sr_cred = scred;	/* Note: ref hold done by caller. */
	rqp->sr_pid = (uint16_t)ddi_get_pid();
	error = smb_rq_new(rqp, cmd);

	return (error);
}

/*
 * Look up the supplied hostname in the rdc_link_down chain. Add a new
 * entry if it isn't found. Return a pointer to the new or found entry.
 */
static rdc_link_down_t *
rdc_lookup_host(char *host)
{
	rdc_link_down_t *p;

	mutex_enter(&rdc_ping_lock);

	if (rdc_link_down == NULL) {
		rdc_link_down = kmem_zalloc(sizeof (*rdc_link_down), KM_SLEEP);
		rdc_link_down->next = rdc_link_down;
	}

	for (p = rdc_link_down->next; p != rdc_link_down; p = p->next) {
		if (strcmp(host, p->host) == 0) {
			/* Match */
			mutex_exit(&rdc_ping_lock);
			return (p);
		}
	}

	/* No match, must create a new entry */

	p = kmem_zalloc(sizeof (*p), KM_SLEEP);
	p->link_down = 1;
	p->next = rdc_link_down->next;
	rdc_link_down->next = p;
	(void) strncpy(p->host, host, MAX_RDC_HOST_SIZE);
	mutex_init(&p->syncd_mutex, NULL, MUTEX_DRIVER, NULL);
	cv_init(&p->syncd_cv, NULL, CV_DRIVER, NULL);

	mutex_exit(&rdc_ping_lock);
	return (p);
}

/*
 * ksem object management including creation and reference counting
 * routines.
 */
static struct ksem *
ksem_alloc(struct ucred *ucred, mode_t mode, unsigned int value)
{
	struct ksem *ks;

	mtx_lock(&ksem_count_lock);
	if (nsems == p31b_getcfg(CTL_P1003_1B_SEM_NSEMS_MAX) || ksem_dead) {
		mtx_unlock(&ksem_count_lock);
		return (NULL);
	}
	nsems++;
	mtx_unlock(&ksem_count_lock);
	ks = malloc(sizeof(*ks), M_KSEM, M_WAITOK | M_ZERO);
	ks->ks_uid = ucred->cr_uid;
	ks->ks_gid = ucred->cr_gid;
	ks->ks_mode = mode;
	ks->ks_value = value;
	cv_init(&ks->ks_cv, "ksem");
	vfs_timestamp(&ks->ks_birthtime);
	ks->ks_atime = ks->ks_mtime = ks->ks_ctime = ks->ks_birthtime;
	refcount_init(&ks->ks_ref, 1);
#ifdef MAC
	mac_posixsem_init(ks);
	mac_posixsem_create(ucred, ks);
#endif

	return (ks);
}

ACPI_STATUS
AcpiOsCreateSemaphore(UINT32 MaxUnits, UINT32 InitialUnits,
    ACPI_SEMAPHORE *OutHandle)
{
	struct acpi_sema	*as;

	ACPI_FUNCTION_TRACE((char *)(uintptr_t)__func__);

	if (OutHandle == NULL || MaxUnits == 0 || InitialUnits > MaxUnits)
		return_ACPI_STATUS (AE_BAD_PARAMETER);

	if ((as = malloc(sizeof(*as), M_ACPISEM, M_NOWAIT | M_ZERO)) == NULL)
		return_ACPI_STATUS (AE_NO_MEMORY);

	snprintf(as->as_name, sizeof(as->as_name), "ACPI sema (%p)", as);
	mtx_init(&as->as_lock, as->as_name, NULL, MTX_DEF);
	cv_init(&as->as_cv, as->as_name);
	as->as_maxunits = MaxUnits;
	as->as_units = InitialUnits;

	*OutHandle = (ACPI_SEMAPHORE)as;

	ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "created %s, max %u, initial %u\n",
	    as->as_name, MaxUnits, InitialUnits));

	return_ACPI_STATUS (AE_OK);
}