Check in the pristine copy of ICU 4.6...

icu46/source/common/uinit.c

+/*
+******************************************************************************
+*                                                                            *
+* Copyright (C) 2001-2010, International Business Machines                   *
+*                Corporation and others. All Rights Reserved.                *
+*                                                                            *
+******************************************************************************
+*   file name:  uinit.c
+*   encoding:   US-ASCII
+*   tab size:   8 (not used)
+*   indentation:4
+*
+*   created on: 2001July05
+*   created by: George Rhoten
+*/
+
+#include "unicode/utypes.h"
+#include "unicode/icuplug.h"
+#include "unicode/uclean.h"
+#include "cmemory.h"
+#include "icuplugimp.h"
+#include "uassert.h"
+#include "ucln.h"
+#include "ucln_cmn.h"
+#include "ucnv_io.h"
+#include "umutex.h"
+#include "utracimp.h"
+
+static UBool gICUInitialized = FALSE;
+static UMTX  gICUInitMutex   = NULL;
+
+
+/************************************************
+ The cleanup order is important in this function.
+ Please be sure that you have read ucln.h
+ ************************************************/
+U_CAPI void U_EXPORT2
+u_cleanup(void)
+{
+    UTRACE_ENTRY_OC(UTRACE_U_CLEANUP);
+    umtx_lock(NULL);     /* Force a memory barrier, so that we are sure to see   */
+    umtx_unlock(NULL);   /*   all state left around by any other threads.        */
+
+    ucln_lib_cleanup();
+
+    umtx_destroy(&gICUInitMutex);
+    umtx_cleanup();
+    cmemory_cleanup();       /* undo any heap functions set by u_setMemoryFunctions(). */
+    gICUInitialized = FALSE;
+    UTRACE_EXIT();           /* Must be before utrace_cleanup(), which turns off tracing. */
+/*#if U_ENABLE_TRACING*/
+    utrace_cleanup();
+/*#endif*/
+}
+
+/*
+ * ICU Initialization Function. Need not be called.
+ */
+U_CAPI void U_EXPORT2
+u_init(UErrorCode *status) {
+    UTRACE_ENTRY_OC(UTRACE_U_INIT);
+    /* initialize plugins */
+    uplug_init(status);
+
+    umtx_lock(&gICUInitMutex);
+    if (gICUInitialized || U_FAILURE(*status)) {
+        umtx_unlock(&gICUInitMutex);
+        UTRACE_EXIT_STATUS(*status);
+        return;
+    }
+
+    /*
+     * 2005-may-02
+     *
+     * ICU4C 3.4 (jitterbug 4497) hardcodes the data for Unicode character
+     * properties for APIs that want to be fast.
+     * Therefore, we need not load them here nor check for errors.
+     * Instead, we load the converter alias table to see if any ICU data
+     * is available.
+     * Users should really open the service objects they need and check
+     * for errors there, to make sure that the actual items they need are
+     * available.
+     */
+#if !UCONFIG_NO_CONVERSION
+    ucnv_io_countKnownConverters(status);
+#endif
+
+    gICUInitialized = TRUE;    /* TODO:  don't set if U_FAILURE? */
+    umtx_unlock(&gICUInitMutex);
+    UTRACE_EXIT_STATUS(*status);
+}