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      1 /*
      2 ******************************************************************************
      3 *                                                                            *
      4 * Copyright (C) 2001-2010, International Business Machines                   *
      5 *                Corporation and others. All Rights Reserved.                *
      6 *                                                                            *
      7 ******************************************************************************
      8 *   file name:  uinit.c
      9 *   encoding:   US-ASCII
     10 *   tab size:   8 (not used)
     11 *   indentation:4
     12 *
     13 *   created on: 2001July05
     14 *   created by: George Rhoten
     15 */
     16 
     17 #include "unicode/utypes.h"
     18 #include "unicode/icuplug.h"
     19 #include "unicode/uclean.h"
     20 #include "cmemory.h"
     21 #include "icuplugimp.h"
     22 #include "uassert.h"
     23 #include "ucln.h"
     24 #include "ucln_cmn.h"
     25 #include "ucnv_io.h"
     26 #include "umutex.h"
     27 #include "utracimp.h"
     28 
     29 static UBool gICUInitialized = FALSE;
     30 static UMTX  gICUInitMutex   = NULL;
     31 
     32 
     33 /************************************************
     34  The cleanup order is important in this function.
     35  Please be sure that you have read ucln.h
     36  ************************************************/
     37 U_CAPI void U_EXPORT2
     38 u_cleanup(void)
     39 {
     40     UTRACE_ENTRY_OC(UTRACE_U_CLEANUP);
     41     umtx_lock(NULL);     /* Force a memory barrier, so that we are sure to see   */
     42     umtx_unlock(NULL);   /*   all state left around by any other threads.        */
     43 
     44     ucln_lib_cleanup();
     45 
     46     umtx_destroy(&gICUInitMutex);
     47     umtx_cleanup();
     48     cmemory_cleanup();       /* undo any heap functions set by u_setMemoryFunctions(). */
     49     gICUInitialized = FALSE;
     50     UTRACE_EXIT();           /* Must be before utrace_cleanup(), which turns off tracing. */
     51 /*#if U_ENABLE_TRACING*/
     52     utrace_cleanup();
     53 /*#endif*/
     54 }
     55 
     56 /*
     57  * ICU Initialization Function. Need not be called.
     58  */
     59 U_CAPI void U_EXPORT2
     60 u_init(UErrorCode *status) {
     61     UTRACE_ENTRY_OC(UTRACE_U_INIT);
     62     /* initialize plugins */
     63     uplug_init(status);
     64 
     65     umtx_lock(&gICUInitMutex);
     66     if (gICUInitialized || U_FAILURE(*status)) {
     67         umtx_unlock(&gICUInitMutex);
     68         UTRACE_EXIT_STATUS(*status);
     69         return;
     70     }
     71 
     72     /*
     73      * 2005-may-02
     74      *
     75      * ICU4C 3.4 (jitterbug 4497) hardcodes the data for Unicode character
     76      * properties for APIs that want to be fast.
     77      * Therefore, we need not load them here nor check for errors.
     78      * Instead, we load the converter alias table to see if any ICU data
     79      * is available.
     80      * Users should really open the service objects they need and check
     81      * for errors there, to make sure that the actual items they need are
     82      * available.
     83      */
     84 #if !UCONFIG_NO_CONVERSION
     85     ucnv_io_countKnownConverters(status);
     86 #endif
     87 
     88     gICUInitialized = TRUE;    /* TODO:  don't set if U_FAILURE? */
     89     umtx_unlock(&gICUInitMutex);
     90     UTRACE_EXIT_STATUS(*status);
     91 }
     92