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Detect the existence of pthread_{s,g}etname_np in libpthread on Linux

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Older Linux distributions may not have those functions.

llvm-svn: 296915
This commit is contained in:
Krzysztof Parzyszek 2017-03-03 21:53:12 +00:00
parent 75b3d29cf1
commit 817f226056
2 changed files with 12 additions and 0 deletions
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8
cmake/config-ix.cmake
View File

@ -246,6 +246,14 @@ check_symbol_exists(__GLIBC__ stdio.h LLVM_USING_GLIBC)
if( LLVM_USING_GLIBC )
add_llvm_definitions( -D_GNU_SOURCE )
endif()
# This check requires _GNU_SOURCE
if(HAVE_LIBPTHREAD)
check_library_exists(pthread pthread_getname_np "" HAVE_PTHREAD_GETNAME_NP)
check_library_exists(pthread pthread_setname_np "" HAVE_PTHREAD_SETNAME_NP)
elseif(PTHREAD_IN_LIBC)
check_library_exists(c pthread_getname_np "" HAVE_PTHREAD_GETNAME_NP)
check_library_exists(c pthread_setname_np "" HAVE_PTHREAD_SETNAME_NP)
endif()
set(headers "sys/types.h")

4
lib/Support/Unix/Threading.inc
View File

@ -115,8 +115,10 @@ void llvm::set_thread_name(const Twine &Name) {
StringRef NameStr = Name.toNullTerminatedStringRef(Storage);
#if defined(__linux__)
#if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
#if HAVE_PTHREAD_SETNAME_NP
::pthread_setname_np(::pthread_self(), NameStr.data());
#endif
#endif
#elif defined(__FreeBSD__)
::pthread_set_name_np(::pthread_self(), NameStr.data());
#elif defined(__NetBSD__)
@ -173,10 +175,12 @@ void llvm::get_thread_name(SmallVectorImpl<char> &Name) {
Name.append(buf, buf + strlen(buf));
#elif defined(__linux__)
#if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
#if HAVE_PTHREAD_GETNAME_NP
constexpr int MAXNAMELEN = 16;
char Buffer[MAXNAMELEN];
if (0 == ::pthread_getname_np(::pthread_self(), Buffer, MAXNAMELEN))
Name.append(Buffer, Buffer + strlen(Buffer));
#endif
#endif
#endif
}