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