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e0cf3b9a3c
One of the aspects of CloudABI is that it aims to help you write code that is thread-safe out of the box. This is very important if you want to write libraries that are easy to reuse. For CloudABI we decided to not provide the thread-unsafe functions. So far this is working out pretty well, as thread-unsafety issues are detected really early on. The following patch adds a knob to libc++, _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS, that can be set to disable thread-unsafe functions that can easily be avoided in practice. The following functions are not thread-safe: - <clocale>: locale handles should be preferred over setlocale(). - <cstdlib>: mbrlen(), mbrtowc() and wcrtomb() should be preferred over their non-restartable counterparts. - <ctime>: asctime(), ctime(), gmtime() and localtime() are not thread-safe. The first two are also deprecated by POSIX. Differential Revision: http://reviews.llvm.org/D8703 Reviewed by: marshall llvm-svn: 240527
51 lines
2.4 KiB
C++
51 lines
2.4 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is dual licensed under the MIT and the University of Illinois Open
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// Source Licenses. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// <string.h>
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#include <string.h>
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#include <type_traits>
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#ifndef NULL
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#error NULL not defined
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#endif
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int main()
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{
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size_t s = 0;
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void* vp = 0;
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const void* vpc = 0;
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char* cp = 0;
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const char* cpc = 0;
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static_assert((std::is_same<decltype(memcpy(vp, vpc, s)), void*>::value), "");
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static_assert((std::is_same<decltype(memmove(vp, vpc, s)), void*>::value), "");
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static_assert((std::is_same<decltype(strcpy(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(strncpy(cp, cpc, s)), char*>::value), "");
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static_assert((std::is_same<decltype(strcat(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(strncat(cp, cpc, s)), char*>::value), "");
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static_assert((std::is_same<decltype(memcmp(vpc, vpc, s)), int>::value), "");
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static_assert((std::is_same<decltype(strcmp(cpc, cpc)), int>::value), "");
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static_assert((std::is_same<decltype(strncmp(cpc, cpc, s)), int>::value), "");
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static_assert((std::is_same<decltype(strcoll(cpc, cpc)), int>::value), "");
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static_assert((std::is_same<decltype(strxfrm(cp, cpc, s)), size_t>::value), "");
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static_assert((std::is_same<decltype(memchr(vp, 0, s)), void*>::value), "");
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static_assert((std::is_same<decltype(strchr(cp, 0)), char*>::value), "");
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static_assert((std::is_same<decltype(strcspn(cpc, cpc)), size_t>::value), "");
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static_assert((std::is_same<decltype(strpbrk(cp, cpc)), char*>::value), "");
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static_assert((std::is_same<decltype(strrchr(cp, 0)), char*>::value), "");
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static_assert((std::is_same<decltype(strspn(cpc, cpc)), size_t>::value), "");
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static_assert((std::is_same<decltype(strstr(cp, cpc)), char*>::value), "");
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#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
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static_assert((std::is_same<decltype(strtok(cp, cpc)), char*>::value), "");
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#endif
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static_assert((std::is_same<decltype(memset(vp, 0, s)), void*>::value), "");
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static_assert((std::is_same<decltype(strerror(0)), char*>::value), "");
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static_assert((std::is_same<decltype(strlen(cpc)), size_t>::value), "");
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}
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