C++ PR_NewLock函数代码示例

nsresult
nsConsoleService::Init()
{
    mMessages = (nsIConsoleMessage **)
        nsMemory::Alloc(mBufferSize * sizeof(nsIConsoleMessage *));
    if (!mMessages)
        return NS_ERROR_OUT_OF_MEMORY;

    // Array elements should be 0 initially for circular buffer algorithm.
    memset(mMessages, 0, mBufferSize * sizeof(nsIConsoleMessage *));

    mLock = PR_NewLock();
    if (!mLock)
        return NS_ERROR_OUT_OF_MEMORY;

    return NS_OK;
}

static PRIntn prmain(PRIntn argc, char **argv)
{
    PRStatus rv;
    PRLock *ml = PR_NewLock();
    PRCondVar *cv = PRP_NewNakedCondVar();
    PRIntervalTime tenmsecs = PR_MillisecondsToInterval(10);

    rv = PRP_TryLock(ml);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1; 
    
    rv = PRP_TryLock(ml);
    PR_ASSERT(PR_FAILURE == rv);
    if ((rv != PR_FAILURE) & (!debug_mode)) failed_already=1; 

    rv = PRP_NakedNotify(cv);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1; 

    rv = PRP_NakedBroadcast(cv);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1; 

    rv = PRP_NakedWait(cv, ml, tenmsecs);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1;     

    PR_Unlock(ml);    
        
    rv = PRP_NakedNotify(cv);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1;     

    rv = PRP_NakedBroadcast(cv);
    PR_ASSERT(PR_SUCCESS == rv);
    if ((rv != PR_SUCCESS) & (!debug_mode)) failed_already=1;     

    PRP_DestroyNakedCondVar(cv);
    PR_DestroyLock(ml);

    if (debug_mode) printf("Test succeeded\n");

    return 0;

}  /* prmain */

/* new searchthread */
SearchThread *st_new(void)
{
    SearchThread *st = (SearchThread *)malloc(sizeof(SearchThread));

    if (!st) return NULL;
    st->searchCount = st->failCount = 0;
    st->mintime = 10000;
    st->maxtime = 0;
    st->ld = NULL;
    st->ld2 = NULL;
    st->soc = -1;
    st->tid = NULL;
    st->id = 0;
    st->alive = 1;
    st->lock = PR_NewLock();
	st->retry = 0;
    return st;
}

/**************************************************************************
 *
 * P k 1 1 I n s t a l l _ S e t E r r o r H a n d l e r
 *
 * Sets the error handler to be used by the library.  Returns the current
 * error handler function.
 */
Pk11Install_ErrorHandler
Pk11Install_SetErrorHandler(Pk11Install_ErrorHandler handler)
{
    Pk11Install_ErrorHandler old;

    if (!errorHandlerLock) {
        errorHandlerLock = PR_NewLock();
    }

    PR_Lock(errorHandlerLock);

    old = errorHandler;
    errorHandler = handler;

    PR_Unlock(errorHandlerLock);

    return old;
}

/*
 * Create a new, empty object set.
 * Returns a pointer to the new object set, or NULL if an error occurred.
 */
Objset *
objset_new(FNFree objset_destructor)
{
	objset *set;

	set = (objset *)slapi_ch_malloc(sizeof(objset));
	set->lock = PR_NewLock();
	if (NULL == set->lock)
	{
		slapi_ch_free((void **)&set);
	}
	else
	{
		set->head = set->tail = NULL;
		set->destructor = objset_destructor;
	}
	return set;
}

static void
create_counters()
{
	PR_CREATE_COUNTER(slapi_ch_counter_malloc,"slapi_ch","malloc","");
	PR_CREATE_COUNTER(slapi_ch_counter_calloc,"slapi_ch","calloc","");
	PR_CREATE_COUNTER(slapi_ch_counter_realloc,"slapi_ch","realloc","");
	PR_CREATE_COUNTER(slapi_ch_counter_strdup,"slapi_ch","strdup","");
	PR_CREATE_COUNTER(slapi_ch_counter_free,"slapi_ch","free","");
	PR_CREATE_COUNTER(slapi_ch_counter_created,"slapi_ch","created","");
	PR_CREATE_COUNTER(slapi_ch_counter_exist,"slapi_ch","exist","");

	/* ensure that we have space to allow for shutdown calls to malloc()
	 * from should we run out of memory.
	 */
	if (oom_emergency_area == NULL) {
	  oom_emergency_area = malloc(OOM_PREALLOC_SIZE);
	}
	oom_emergency_lock = PR_NewLock();
}

void _PR_InitFdCache(void)
{
    /*
    ** The fd caching is enabled by default for DEBUG builds,
    ** disabled by default for OPT builds. That default can
    ** be overridden at runtime using environment variables
    ** or a super-wiz-bang API.
    */
    const char *low = PR_GetEnv("NSPR_FD_CACHE_SIZE_LOW");
    const char *high = PR_GetEnv("NSPR_FD_CACHE_SIZE_HIGH");

    /* 
    ** _low is allowed to be zero, _high is not.
    ** If _high is zero, we're not doing the caching.
    */

    _pr_fd_cache.limit_low = 0;
#if defined(DEBUG)
    _pr_fd_cache.limit_high = FD_SETSIZE;
#else
    _pr_fd_cache.limit_high = 0;
#endif  /* defined(DEBUG) */

    if (NULL != low) _pr_fd_cache.limit_low = atoi(low);
    if (NULL != high) _pr_fd_cache.limit_high = atoi(high);

    if (_pr_fd_cache.limit_low < 0)
        _pr_fd_cache.limit_low = 0;
    if (_pr_fd_cache.limit_low > FD_SETSIZE)
        _pr_fd_cache.limit_low = FD_SETSIZE;

    if (_pr_fd_cache.limit_high > FD_SETSIZE)
        _pr_fd_cache.limit_high = FD_SETSIZE;

    if (_pr_fd_cache.limit_high < _pr_fd_cache.limit_low)
        _pr_fd_cache.limit_high = _pr_fd_cache.limit_low;

    _pr_fd_cache.ml = PR_NewLock();
    PR_ASSERT(NULL != _pr_fd_cache.ml);
    _pr_fd_cache.stack = PR_CreateStack("FD");
    PR_ASSERT(NULL != _pr_fd_cache.stack);

}  /* _PR_InitFdCache */

/* new addthread */
AddThread *at_new(void)
{
    AddThread *at = (AddThread *)malloc(sizeof(AddThread));

    if (!at) return NULL;
    at->addCount = at->failCount = at->addTotal = 0;
    at->mintime = 10000;
    at->maxtime = 0;
    at->ld = NULL;
    at->tid = NULL;
    at->id = 0;
    at->alive = 1;
    at->retry = 0;
    at->lock = PR_NewLock();
    at->blob = NULL;
    /* make sure the id generator has initialized */
    getID();
    return at;
}

void*
jsd_CreateLock()
{
    JSDStaticLock* lock;

    if( ! (lock = (JSDStaticLock*)calloc(1, sizeof(JSDStaticLock))) || 
        ! (lock->lock = PR_NewLock()) )
    {
        if(lock)
        {
            free(lock);
            lock = NULL;
        }
    }
#ifdef DEBUG
    if(lock) lock->sig = (uint16) JSD_LOCK_SIG;
#endif
    return lock;
}    

static PRIntn PR_CALLBACK RealMain( PRIntn argc, char **argv )
{
	PLOptStatus os;
  	PLOptState *opt = PL_CreateOptState(argc, argv, "dhlmc");
	PRBool locks = PR_FALSE, monitors = PR_FALSE, cmonitors = PR_FALSE;

    err = PR_GetSpecialFD(PR_StandardError);

	while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
    {
		if (PL_OPT_BAD == os) continue;
        switch (opt->option)
        {
        case 'd':  /* debug mode (noop) */
            break;
        case 'l':  /* locks */
			locks = PR_TRUE;
            break;
        case 'm':  /* monitors */
			monitors = PR_TRUE;
            break;
        case 'c':  /* cached monitors */
			cmonitors = PR_TRUE;
            break;
        case 'h':  /* needs guidance */
         default:
            Help();
            return 2;
        }
    }
	PL_DestroyOptState(opt);

    ml = PR_NewLock();
    if (locks) T1Lock();
    if (monitors) T1Mon();
    if (cmonitors) T1CMon();

    PR_DestroyLock(ml);

    PR_fprintf(err, "Done!\n");    
    return 0;
}  /* main */

static PRStatus TimerInit(void)
{
    tm_vars.ml = PR_NewLock();
    if (NULL == tm_vars.ml)
    {
        goto failed;
    }
    tm_vars.new_timer = PR_NewCondVar(tm_vars.ml);
    if (NULL == tm_vars.new_timer)
    {
        goto failed;
    }
    tm_vars.cancel_timer = PR_NewCondVar(tm_vars.ml);
    if (NULL == tm_vars.cancel_timer)
    {
        goto failed;
    }
    PR_INIT_CLIST(&tm_vars.timer_queue);
    tm_vars.manager_thread = PR_CreateThread(
        PR_SYSTEM_THREAD, TimerManager, NULL, PR_PRIORITY_NORMAL,
        PR_LOCAL_THREAD, PR_UNJOINABLE_THREAD, 0);
    if (NULL == tm_vars.manager_thread)
    {
        goto failed;
    }
    return PR_SUCCESS;

failed:
    if (NULL != tm_vars.cancel_timer)
    {
        PR_DestroyCondVar(tm_vars.cancel_timer);
    }
    if (NULL != tm_vars.new_timer)
    {
        PR_DestroyCondVar(tm_vars.new_timer);
    }
    if (NULL != tm_vars.ml)
    {
        PR_DestroyLock(tm_vars.ml);
    }
    return PR_FAILURE;
}

static PRIntervalTime ContentiousLock(PRUint32 loops)
{
    PRStatus status;
    PRThread *thread = NULL;
    LockContentious_t * contention;
    PRIntervalTime rv, overhead, timein = PR_IntervalNow();

    contention = PR_NEWZAP(LockContentious_t);
    contention->loops = loops;
    contention->overhead = 0;
    contention->ml = PR_NewLock();
    contention->interval = contention_interval;
    thread = PR_CreateThread(
        PR_USER_THREAD, LockContender, contention,
        PR_PRIORITY_LOW, PR_LOCAL_THREAD, PR_JOINABLE_THREAD, 0);
    PR_ASSERT(thread != NULL);

    overhead = PR_IntervalNow() - timein;

    while (contention->loops-- > 0)
    {
        PR_Lock(contention->ml);
        PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(contention->ml);
        contention->contentious+= 1;
        contention->overhead += contention->interval;
        PR_Sleep(contention->interval);
        PR_ASSERT_CURRENT_THREAD_OWNS_LOCK(contention->ml);
        PR_Unlock(contention->ml);
    }

    timein = PR_IntervalNow();
    status = PR_JoinThread(thread);
    PR_DestroyLock(contention->ml);
    overhead += (PR_IntervalNow() - timein);
    rv = overhead + contention->overhead;
    if (verbosity)
        PR_fprintf(
            std_err, "Access ratio: %u to %u\n",
            contention->contentious, contention->contender);
    PR_Free(contention);
    return rv;
}  /* ContentiousLock */

LdapSessionPool::LdapSessionPool(LdapRealm *ldapRealm,int limit)
{
    _ldapRealm = ldapRealm;
    _maxSessions = (limit < 1 ? 1 : limit);
    _waiters = 0;
    _lock = PR_NewLock();
    assert(_lock);
    _cvar = PR_NewCondVar(_lock);
    assert(_cvar);

    // add new pool to list of all pools
    if (_poolListLock == NULL) {
        static PRCallOnceType once = { 0, 0, (PRStatus)0 };
        PR_CallOnce(&once, PoolListCreate);
    }
    PR_Lock(_poolListLock);
    _nextPool = _poolList;
    _poolList = this;
    PR_Unlock(_poolListLock);
}

nsSocketTransportService::nsSocketTransportService()
    : mThread(nsnull)
    , mThreadEvent(nsnull)
    , mAutodialEnabled(PR_FALSE)
    , mLock(PR_NewLock())
    , mInitialized(PR_FALSE)
    , mShuttingDown(PR_FALSE)
    , mActiveCount(0)
    , mIdleCount(0)
    , mSendBufferSize(0)
{
#if defined(PR_LOGGING)
    gSocketTransportLog = PR_NewLogModule("nsSocketTransport");
#endif

    NS_ASSERTION(NS_IsMainThread(), "wrong thread");

    NS_ASSERTION(!gSocketTransportService, "must not instantiate twice");
    gSocketTransportService = this;
}

//-----------------------------------------------------------------------------
CDatabaseQuery::CDatabaseQuery()
: m_pLock(PR_NewLock())
, m_IsAborting(PR_FALSE)
, m_IsExecuting(PR_FALSE)
, m_AsyncQuery(PR_FALSE)
, m_CurrentQuery((PRUint32)-1)
, m_LastError(0)
, m_pQueryRunningMonitor(nsAutoMonitor::NewMonitor("CDatabaseQuery.m_pdbQueryRunningMonitor"))
, m_QueryHasCompleted(PR_FALSE)
, m_RollingLimit(0)
, m_RollingLimitColumnIndex(0)
, m_RollingLimitResult(0)
{
#ifdef PR_LOGGING
  if (!sDatabaseQueryLog)
    sDatabaseQueryLog = PR_NewLogModule("sbDatabaseQuery");
#endif

  m_CallbackList.Init(DATABASEQUERY_DEFAULT_CALLBACK_SLOTS);
} //ctor