125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/*
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******************************************************************************
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* Copyright (C) 2001-2014, International Business Machines
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* Corporation and others. All Rights Reserved.
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******************************************************************************
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* file name: ucln_cmn.cpp
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* encoding: UTF-8
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* tab size: 8 (not used)
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* indentation:4
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*
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* created on: 2001July05
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* created by: George Rhoten
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*/
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#include "unicode/utypes.h"
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#include "unicode/uclean.h"
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#include "cmemory.h"
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#include "mutex.h"
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#include "uassert.h"
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#include "ucln.h"
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#include "ucln_cmn.h"
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#include "utracimp.h"
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#include "umutex.h"
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/** Auto-client for UCLN_COMMON **/
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#define UCLN_TYPE_IS_COMMON
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#include "ucln_imp.h"
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static cleanupFunc *gCommonCleanupFunctions[UCLN_COMMON_COUNT];
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static cleanupFunc *gLibCleanupFunctions[UCLN_COMMON];
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/************************************************
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The cleanup order is important in this function.
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Please be sure that you have read ucln.h
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************************************************/
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U_CAPI void U_EXPORT2
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u_cleanup(void)
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{
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UTRACE_ENTRY_OC(UTRACE_U_CLEANUP);
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icu::umtx_lock(NULL); /* Force a memory barrier, so that we are sure to see */
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icu::umtx_unlock(NULL); /* all state left around by any other threads. */
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ucln_lib_cleanup();
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cmemory_cleanup(); /* undo any heap functions set by u_setMemoryFunctions(). */
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UTRACE_EXIT(); /* Must be before utrace_cleanup(), which turns off tracing. */
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/*#if U_ENABLE_TRACING*/
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utrace_cleanup();
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/*#endif*/
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}
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U_CAPI void U_EXPORT2 ucln_cleanupOne(ECleanupLibraryType libType)
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{
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if (gLibCleanupFunctions[libType])
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{
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gLibCleanupFunctions[libType]();
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gLibCleanupFunctions[libType] = NULL;
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}
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}
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U_CFUNC void
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ucln_common_registerCleanup(ECleanupCommonType type,
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cleanupFunc *func)
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{
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// Thread safety messiness: From ticket 10295, calls to registerCleanup() may occur
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// concurrently. Although such cases should be storing the same value, they raise errors
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// from the thread sanity checker. Doing the store within a mutex avoids those.
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// BUT that can trigger a recursive entry into std::call_once() in umutex.cpp when this code,
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// running from the call_once function, tries to grab the ICU global mutex, which
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// re-enters the mutex init path. So, work-around by special casing UCLN_COMMON_MUTEX, not
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// using the ICU global mutex for it.
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//
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// No other point in ICU uses std::call_once().
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U_ASSERT(UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT);
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if (type == UCLN_COMMON_MUTEX) {
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gCommonCleanupFunctions[type] = func;
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} else if (UCLN_COMMON_START < type && type < UCLN_COMMON_COUNT) {
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icu::Mutex m; // See ticket 10295 for discussion.
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gCommonCleanupFunctions[type] = func;
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}
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#if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
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ucln_registerAutomaticCleanup();
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#endif
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}
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// Note: ucln_registerCleanup() is called with the ICU global mutex locked.
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// Be aware if adding anything to the function.
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// See ticket 10295 for discussion.
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U_CAPI void U_EXPORT2
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ucln_registerCleanup(ECleanupLibraryType type,
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cleanupFunc *func)
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{
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U_ASSERT(UCLN_START < type && type < UCLN_COMMON);
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if (UCLN_START < type && type < UCLN_COMMON)
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{
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gLibCleanupFunctions[type] = func;
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}
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}
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U_CFUNC UBool ucln_lib_cleanup(void) {
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int32_t libType = UCLN_START;
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int32_t commonFunc = UCLN_COMMON_START;
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for (libType++; libType<UCLN_COMMON; libType++) {
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ucln_cleanupOne(static_cast<ECleanupLibraryType>(libType));
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}
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for (commonFunc++; commonFunc<UCLN_COMMON_COUNT; commonFunc++) {
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if (gCommonCleanupFunctions[commonFunc])
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{
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gCommonCleanupFunctions[commonFunc]();
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gCommonCleanupFunctions[commonFunc] = NULL;
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}
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}
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#if !UCLN_NO_AUTO_CLEANUP && (defined(UCLN_AUTO_ATEXIT) || defined(UCLN_AUTO_LOCAL))
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ucln_unRegisterAutomaticCleanup();
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#endif
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return true;
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}
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