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#include <errno.h>

#include <pthread.h>

#include "qglobal.h"

#include "qmutex.h"

#include "qmutex_p.h"

static pthread_mutex_t qAtomicMutex = PTHREAD_MUTEX_INITIALIZER;

static void report_error(int code, const char *where, const char *what)

{

    if (code != 0)

        qWarning("%s: %s failure: %d", where, what, code);

}

QMutexPrivate::QMutexPrivate()

    : contenders(0), wakeup(FALSE)

{

    report_error(pthread_mutex_init(&mutex, NULL), "QMutex", "mutex init");

    report_error(pthread_cond_init(&cond, NULL), "QMutex", "cv init");

}

QMutexPrivate::~QMutexPrivate()

{

    report_error(pthread_cond_destroy(&cond), "QMutex", "cv destroy");

    report_error(pthread_mutex_destroy(&mutex), "QMutex", "mutex destroy");

}

void QMutexPrivate::wait()

{

    report_error(pthread_mutex_lock(&mutex), "QMutex::lock", "mutex lock");

    int errorCode = 0;

    while (!wakeup)

    {

        errorCode = pthread_cond_wait(&cond, &mutex);

        if (errorCode)

        {

            report_error(errorCode, "QMutex::lock()", "cv wait");

        }

    }

    wakeup = FALSE;

    report_error(pthread_mutex_unlock(&mutex), "QMutex::lock", "mutex unlock");

}

void QMutexPrivate::wakeUp()

{

    report_error(pthread_mutex_lock(&mutex), "QMutex::unlock", "mutex lock");

    wakeup = TRUE;

    report_error(pthread_cond_signal(&cond), "QMutex::unlock", "cv signal");

    report_error(pthread_mutex_unlock(&mutex), "QMutex::unlock", "mutex unlock");

}

bool QAtomicInt::testAndSet(int expectedValue,int newValue)

{

  bool returnValue = false;

  pthread_mutex_lock(&qAtomicMutex);

  if (m_value == expectedValue)

  {

    m_value = newValue;

    returnValue = true;

  }

  pthread_mutex_unlock(&qAtomicMutex);

  return returnValue;

}

int QAtomicInt::fetchAndAdd(int valueToAdd)

{

  int returnValue;

  pthread_mutex_lock(&qAtomicMutex);

  returnValue = m_value;

  m_value += valueToAdd;

  pthread_mutex_unlock(&qAtomicMutex);

  return returnValue;

}