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Apply constexpr to the mutex constructor. As a conforming extension, apply constexpr to the condition_variable constructor. These are important because it enables the compiler to construct these types at compile time, even though the object will be non-const. Since they are constructed at compile time, there is no chance of a data race before they are constructed. 

llvm-svn: 159901
This commit is contained in:
Howard Hinnant 2012-07-07 20:01:52 +00:00
parent eeac9fcfb7
commit bfa7990b5a
1 changed files with 8 additions and 0 deletions
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8
libcxx/include/__mutex_base
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@ -38,7 +38,11 @@ class _LIBCPP_VISIBLE mutex
public:
_LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_HAS_NO_CONSTEXPR
constexpr mutex() : __m_ PTHREAD_MUTEX_INITIALIZER {}
#else
mutex() {__m_ = (pthread_mutex_t)PTHREAD_MUTEX_INITIALIZER;}
#endif
~mutex();
private:
@ -297,7 +301,11 @@ class _LIBCPP_VISIBLE condition_variable
pthread_cond_t __cv_;
public:
_LIBCPP_INLINE_VISIBILITY
#ifndef _LIBCPP_HAS_NO_CONSTEXPR
constexpr condition_variable() : __cv_ PTHREAD_COND_INITIALIZER {}
#else
condition_variable() {__cv_ = (pthread_cond_t)PTHREAD_COND_INITIALIZER;}
#endif
~condition_variable();
private: