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      1 //  2016 and later: Unicode, Inc. and others.
      2 // License & terms of use: http://www.unicode.org/copyright.html
      3 /*
      4 ******************************************************************************
      5 * Copyright (C) 2001-2014, International Business Machines
      6 *                Corporation and others. All Rights Reserved.
      7 ******************************************************************************
      8 *   file name:  ucln_cmn.cpp
      9 *   encoding:   UTF-8
     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/uclean.h"
     19 #include "cmemory.h"
     20 #include "mutex.h"
     21 #include "uassert.h"
     22 #include "ucln.h"
     23 #include "ucln_cmn.h"
     24 #include "utracimp.h"
     25 #include "umutex.h"
     26 
     27 /**  Auto-client for UCLN_COMMON **/
     28 #define UCLN_TYPE_IS_COMMON
     29 #include "ucln_imp.h"
     30 
     31 static cleanupFunc *gCommonCleanupFunctions[UCLN_COMMON_COUNT];
     32 static cleanupFunc *gLibCleanupFunctions[UCLN_COMMON];
     33 
     34 
     35 /************************************************
     36  The cleanup order is important in this function.
     37  Please be sure that you have read ucln.h
     38  ************************************************/
     39 U_CAPI void U_EXPORT2
     40 u_cleanup(void)
     41 {
     42     UTRACE_ENTRY_OC(UTRACE_U_CLEANUP);
     43     umtx_lock(NULL);     /* Force a memory barrier, so that we are sure to see   */
     44     umtx_unlock(NULL);   /*   all state left around by any other threads.        */
     45 
     46     ucln_lib_cleanup();
     47 
     48     cmemory_cleanup();       /* undo any heap functions set by u_setMemoryFunctions(). */
     49     UTRACE_EXIT();           /* Must be before utrace_cleanup(), which turns off tracing. */
     50 /*#if U_ENABLE_TRACING*/
     51     utrace_cleanup();
     52 /*#endif*/
     53 }
     54 
     55 U_CAPI void U_EXPORT2 ucln_cleanupOne(ECleanupLibraryType libType)
     56 {
     57     if (gLibCleanupFunctions[libType])
     58     {
     59         gLibCleanupFunctions[libType]();
     60         gLibCleanupFunctions[libType] = NULL;
     61     }
     62 }
     63 
     64 U_CFUNC void
     65 ucln_common_registerCleanup(ECleanupCommonType type,
     66                             cleanupFunc *func)
     67 {
     68     U_ASSERT(UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT);
     69     if (UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT)
     70     {
     71         icu::Mutex m;     // See ticket 10295 for discussion.
     72         gCommonCleanupFunctions[type] = func;
     73     }
     74 #if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
     75     ucln_registerAutomaticCleanup();
     76 #endif
     77 }
     78 
     79 // Note: ucln_registerCleanup() is called with the ICU global mutex locked.
     80 //       Be aware if adding anything to the function.
     81 //       See ticket 10295 for discussion.
     82 
     83 U_CAPI void U_EXPORT2
     84 ucln_registerCleanup(ECleanupLibraryType type,
     85                      cleanupFunc *func)
     86 {
     87     U_ASSERT(UCLN_START < type && type < UCLN_COMMON);
     88     if (UCLN_START < type && type < UCLN_COMMON)
     89     {
     90         gLibCleanupFunctions[type] = func;
     91     }
     92 }
     93 
     94 U_CFUNC UBool ucln_lib_cleanup(void) {
     95     int32_t libType = UCLN_START;
     96     int32_t commonFunc = UCLN_COMMON_START;
     97 
     98     for (libType++; libType<UCLN_COMMON; libType++) {
     99         ucln_cleanupOne(static_cast<ECleanupLibraryType>(libType));
    100     }
    101 
    102     for (commonFunc++; commonFunc<UCLN_COMMON_COUNT; commonFunc++) {
    103         if (gCommonCleanupFunctions[commonFunc])
    104         {
    105             gCommonCleanupFunctions[commonFunc]();
    106             gCommonCleanupFunctions[commonFunc] = NULL;
    107         }
    108     }
    109 #if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
    110     ucln_unRegisterAutomaticCleanup();
    111 #endif
    112     return TRUE;
    113 }
    114