solarisplatformutils.cpp

来自「IBM的解析xml的工具Xerces的源代码」· C++ 代码 · 共 660 行 · 第 1/2 页

    //get the absolute path
    char* retPath = realpath(newSrc, &absPath[0]);

    if (!retPath)
    {
        ThrowXMLwithMemMgr(XMLPlatformUtilsException, XMLExcepts::File_CouldNotGetBasePathName, manager);
    }
    return XMLString::transcode(absPath, manager);
}

bool XMLPlatformUtils::isRelative(const XMLCh* const toCheck
                                  , MemoryManager* const manager)
{
    // Check for pathological case of empty path
    if (!toCheck[0])
        return false;

    //
    //  If it starts with a slash, then it cannot be relative. This covers
    //  both something like "\Test\File.xml" and an NT Lan type remote path
    //  that starts with a node like "\\MyNode\Test\File.xml".
    //
    if (toCheck[0] == XMLCh('/'))
        return false;

    // Else assume its a relative path
    return true;
}

XMLCh* XMLPlatformUtils::getCurrentDirectory(MemoryManager* const manager)
{
    char  dirBuf[PATH_MAX + 2];
    char  *curDir = getcwd(&dirBuf[0], PATH_MAX + 1);

    if (!curDir)
    {
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::File_CouldNotGetBasePathName, manager);
    }

    return XMLString::transcode(curDir, manager);
}

inline bool XMLPlatformUtils::isAnySlash(XMLCh c) 
{
    return ( chBackSlash == c || chForwardSlash == c);
}

// ---------------------------------------------------------------------------
//  XMLPlatformUtils: Timing Methods
// ---------------------------------------------------------------------------
unsigned long XMLPlatformUtils::getCurrentMillis()
{
    timeb aTime;
    ftime(&aTime);
    return (unsigned long)(aTime.time*1000 + aTime.millitm);
}


// -----------------------------------------------------------------------
//  Mutex methods
// -----------------------------------------------------------------------

#if !defined (APP_NO_THREADS)

// ---------------------------------------------------------------------------
//  XMLPlatformUtils: Platform init method
// ---------------------------------------------------------------------------

static pthread_mutex_t* gAtomicOpMutex =0 ;

void XMLPlatformUtils::platformInit()
{
    //
    // The gAtomicOpMutex mutex needs to be created
    // because compareAndSwap and incrementlocation and decrementlocation
    // does not have the atomic system calls for usage
    // Normally, mutexes are created on first use, but there is a
    // circular dependency between compareAndExchange() and
    // mutex creation that must be broken.

    gAtomicOpMutex = new pthread_mutex_t;

#if defined(XML_USE_DCE)
    if (pthread_mutex_init(gAtomicOpMutex, pthread_mutexattr_default)) {
	delete gAtomicOpMutex;
	gAtomicOpMutex = 0;
        panic( PanicHandler::Panic_SystemInit );
    }
#else // XML_USE_DCE
    if (pthread_mutex_init(gAtomicOpMutex, NULL)) {
	delete gAtomicOpMutex;
	gAtomicOpMutex = 0;
        panic( PanicHandler::Panic_SystemInit );
    }
#endif // XML_USE_DCE
}

#ifndef XML_USE_DCE
// inlining the class with dce threading causes segmentation fault
class  RecursiveMutex
{
public:
    pthread_mutex_t   mutex;
    int               recursionCount;
    pthread_t         tid;

    RecursiveMutex() {
               if (pthread_mutex_init(&mutex, NULL))
                   ThrowXMLwithMemMgr(XMLPlatformUtilsException, XMLExcepts::Mutex_CouldNotCreate, XMLPlatformUtils::fgMemoryManager);
                       recursionCount = 0;
                       tid = 0;
                     }

    ~RecursiveMutex() {
            if (pthread_mutex_destroy(&mutex))
                ThrowXMLwithMemMgr(XMLPlatformUtilsException, XMLExcepts::Mutex_CouldNotDestroy, XMLPlatformUtils::fgMemoryManager);
                      }

     void lock()      {
              if (pthread_equal(tid, pthread_self()))
              {
                  recursionCount++;
                  return;
              }
              if (pthread_mutex_lock(&mutex) != 0)
                  ThrowXMLwithMemMgr(XMLPlatformUtilsException, XMLExcepts::Mutex_CouldNotLock, XMLPlatformUtils::fgMemoryManager);
              tid = pthread_self();
              recursionCount = 1;
              }


     void unlock()    {
                          if (--recursionCount > 0)
                              return;

              if (pthread_mutex_unlock(&mutex) != 0)
                  ThrowXMLwithMemMgr(XMLPlatformUtilsException, XMLExcepts::Mutex_CouldNotUnlock, XMLPlatformUtils::fgMemoryManager);
                          tid = 0;
                       }
   };
#endif // ifndef XML_USE_DCE

void* XMLPlatformUtils::makeMutex()
{
#if defined(XML_USE_DCE)
    pthread_mutex_t* mutex = new pthread_mutex_t;
    if (mutex ==  NULL)
    {
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::Mutex_CouldNotCreate, fgMemoryManager);
    }
    pthread_mutexattr_t attr;
    pthread_mutexattr_create(&attr);
    pthread_mutexattr_setkind_np(&attr, MUTEX_RECURSIVE_NP);
    if (pthread_mutex_init(mutex, attr))
    {
        ThrowXMLwithMemMgr(XMLPlatformUtilsException,
                 XMLExcepts::Mutex_CouldNotCreate, fgMemoryManager);
    }
    pthread_mutexattr_delete(&attr);
    return (void*)(mutex);
#else
    return new RecursiveMutex;
#endif
}


void XMLPlatformUtils::closeMutex(void* const mtxHandle)
{
    if (mtxHandle == NULL)
        return;
#if defined(XML_USE_DCE)
    pthread_mutex_t *rm = (pthread_mutex_t *)mtxHandle;
    pthread_mutex_destroy(rm);
#else
    RecursiveMutex *rm = (RecursiveMutex *)mtxHandle;
#endif
    delete rm;
}


void XMLPlatformUtils::lockMutex(void* const mtxHandle)
{
    if (mtxHandle == NULL)
        return;
#if defined(XML_USE_DCE)
    pthread_mutex_t *rm = (pthread_mutex_t *)mtxHandle;
    pthread_mutex_lock(rm);
#else
    RecursiveMutex *rm = (RecursiveMutex *)mtxHandle;
    rm->lock();
#endif
}

void XMLPlatformUtils::unlockMutex(void* const mtxHandle)
{
    if (mtxHandle == NULL)
        return;
#if defined(XML_USE_DCE)
    pthread_mutex_t *rm = (pthread_mutex_t *)mtxHandle;
    pthread_mutex_unlock(rm);
#else
    RecursiveMutex *rm = (RecursiveMutex *)mtxHandle;
    rm->unlock();
#endif
}

// -----------------------------------------------------------------------
//  Miscellaneous synchronization methods
// -----------------------------------------------------------------------
//atomic system calls in Solaris is only restricted to kernel libraries
//So, to make operations thread safe we implement static mutex and lock
//the atomic operations. It makes the process slow but what's the alternative!

void* XMLPlatformUtils::compareAndSwap ( void**      toFill ,
                    const void* const newValue ,
                    const void* const toCompare)
{
    //return ((void*)cas32( (uint32_t*)toFill,  (uint32_t)toCompare, (uint32_t)newValue) );
    // the below calls are temporarily made till the above functions are part of user library
    // Currently its supported only in the kernel mode

    if (pthread_mutex_lock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    void *retVal = *toFill;
    if (*toFill == toCompare)
              *toFill = (void *)newValue;

    if (pthread_mutex_unlock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    return retVal;
}

int XMLPlatformUtils::atomicIncrement(int &location)
{
    //return (int)atomic_add_32_nv( (uint32_t*)&location, 1);

    if (pthread_mutex_lock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    int tmp = ++location;

    if (pthread_mutex_unlock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    return tmp;
}
int XMLPlatformUtils::atomicDecrement(int &location)
{
    //return (int)atomic_add_32_nv( (uint32_t*)&location, -1);

    if (pthread_mutex_lock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    int tmp = --location;

    if (pthread_mutex_unlock( gAtomicOpMutex))
        panic(PanicHandler::Panic_SynchronizationErr);

    return tmp;
}

#else // #if !defined (APP_NO_THREADS)

void XMLPlatformUtils::platformInit()
{
}

void XMLPlatformUtils::closeMutex(void* const mtxHandle)
{
}

void XMLPlatformUtils::lockMutex(void* const mtxHandle)
{
}

void* XMLPlatformUtils::makeMutex()
{
        return 0;
}

void XMLPlatformUtils::unlockMutex(void* const mtxHandle)
{
}

void* XMLPlatformUtils::compareAndSwap ( void**      toFill,
                                   const void* const newValue,
                                   const void* const toCompare)
{
    void *retVal = *toFill;
    if (*toFill == toCompare)
       *toFill = (void *)newValue;
    return retVal;
}

int XMLPlatformUtils::atomicIncrement(int &location)
{
    return ++location;
}

int XMLPlatformUtils::atomicDecrement(int &location)
{
    return --location;
}

#endif // APP_NO_THREADS



FileHandle XMLPlatformUtils::openStdInHandle(MemoryManager* const manager)
{
        return (FileHandle)dup(0);
}

void XMLPlatformUtils::platformTerm()
{
#if !defined(APP_NO_THREADS)
	pthread_mutex_destroy(gAtomicOpMutex);
    delete gAtomicOpMutex;
	gAtomicOpMutex = 0;
#endif
}

#include <xercesc/util/LogicalPath.c>

XERCES_CPP_NAMESPACE_END