icuSources/common/mutex.cpp

   1 /*
   2 *******************************************************************************
   3 *
   4 *   Copyright (C) 2008-2010, International Business Machines
   5 *   Corporation and others.  All Rights Reserved.
   6 *
   7 *******************************************************************************
   8 *   file name:  mutex.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 */
  13
  14 #include "unicode/utypes.h"
  15 #include "mutex.h"
  16
  17 U_NAMESPACE_BEGIN
  18
  19 void *SimpleSingleton::getInstance(InstantiatorFn *instantiator, const void *context,
  20                                    void *&duplicate,
  21                                    UErrorCode &errorCode) {
  22     duplicate=NULL;
  23     if(U_FAILURE(errorCode)) {
  24         return NULL;
  25     }
  26     void *instance;
  27     UMTX_CHECK(NULL, fInstance, instance);
  28     if(instance!=NULL) {
  29         return instance;
  30     } else {
  31         instance=instantiator(context, errorCode);
  32         Mutex mutex;
  33         if(fInstance==NULL && U_SUCCESS(errorCode)) {
  34             fInstance=instance;
  35         } else {
  36             duplicate=instance;
  37         }
  38         return fInstance;
  39     }
  40 }
  41
  42 void *TriStateSingleton::getInstance(InstantiatorFn *instantiator, const void *context,
  43                                      void *&duplicate,
  44                                      UErrorCode &errorCode) {
  45     duplicate=NULL;
  46     if(U_FAILURE(errorCode)) {
  47         return NULL;
  48     }
  49     int8_t haveInstance;
  50     UMTX_CHECK(NULL, fHaveInstance, haveInstance);
  51     if(haveInstance>0) {
  52         return fInstance;  // instance was created
  53     } else if(haveInstance<0) {
  54         errorCode=fErrorCode;  // instance creation failed
  55         return NULL;
  56     } else /* haveInstance==0 */ {
  57         void *instance=instantiator(context, errorCode);
  58         Mutex mutex;
  59         if(fHaveInstance==0) {
  60             if(U_SUCCESS(errorCode)) {
  61                 fInstance=instance;
  62                 instance=NULL;
  63                 fHaveInstance=1;
  64             } else {
  65                 fErrorCode=errorCode;
  66                 fHaveInstance=-1;
  67             }
  68         } else {
  69             errorCode=fErrorCode;
  70         }
  71         duplicate=instance;
  72         return fInstance;
  73     }
  74 }
  75
  76 void TriStateSingleton::reset() {
  77     fInstance=NULL;
  78     fErrorCode=U_ZERO_ERROR;
  79     fHaveInstance=0;
  80 }
  81
  82 #if UCONFIG_NO_SERVICE
  83
  84 /* If UCONFIG_NO_SERVICE, then there is no invocation of Mutex elsewhere in
  85    common, so add one here to force an export */
  86 static Mutex *aMutex = 0;
  87
  88 /* UCONFIG_NO_SERVICE */
  89 #endif
  90
  91 U_NAMESPACE_END