std::ctype not thread safe

The 22.locale.ctype.mt thread safety tests aborts at runtime indicating that there is a thread safety issue in the locale implementation. Running the test through the Intel Thread Checker reveals possible causes of the problem.

$ tcheck_cl --format html -o 22.locale.ctype.mt.html 22.locale.ctype.mt --nloops=1000
Intel(R) Thread Checker 3.1 command line instrumentation driver (24400)
Copyright (c) 2007 Intel Corporation. All rights reserved.
Building project

Running: /build/sebor/stdcxx-icc-10.0.025-15S/tests/22.locale.ctype.mt --nloops=1000

1. INFO (S1) (10 lines):
2. TEXT:
3. COMPILER: Intel C++, _INTEL_COMPILER = 1000, __INTEL_COMPILER_BUILD_DATE = 20070613, __EDG_VERSION_ = 308
4. ENVIRONMENT: x86_64/LP64 running linux-elf (Fedora Core release 6 (Zod)) with glibc 2.5
5. FILE: 22.locale.ctype.mt.cpp
6. COMPILED: Jul 29 2007, 16:10:58
7. COMMENT: thread safety
   ############################################################

1. CLAUSE: lib.locale.ctype

1. NOTE (S2) (5 lines):
2. TEXT: executing "locale -a > /tmp/tmpfile-wSljVr"
3. CLAUSE: lib.locale.ctype
4. FILE: process.cpp
5. LINE: 270

1. INFO (S1) (3 lines):
2. TEXT: testing std::ctype<charT> with 2 threads, 1000 iterations each, in 16 locales { "aa_DJ" "aa_DJ.iso88591" "aa_DJ.utf8" "aa_ER" "aa_ER@saaho" "aa_ER.utf8" "aa_ER.utf8@saaho" "aa_ET" "aa_ET.utf8" "af_ZA" "af_ZA.iso88591" "af_ZA.utf8" "am_ET" "am_ET.utf8" "an_ES" "an_ES.iso885915" }
3. CLAUSE: lib.locale.ctype

1. INFO (S1) (3 lines):
2. TEXT: exercising std::ctype<char>
3. CLAUSE: lib.locale.ctype

1. INFO (S1) (3 lines):
2. TEXT: exercising std::ctype<wchar_t>
3. CLAUSE: lib.locale.ctype

/home/sebor/stdcxx/tests/localization/22.locale.ctype.mt.cpp:156: void *thread_func(void *): Assertion 'wc == data->wwidened_ [cinx]' failed.
/build/sebor/stdcxx-icc-10.0.025-15S/tests/./22.locale.ctype.mt[0xbd20c5]

Application finished