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Implement N4508: shared_mutex. Reviewed as http://reviews.llvm.org/D10480

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@241067 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Marshall Clow
2015-06-30 14:04:14 +00:00
parent f3c8fb22ec
commit abadb458d0
10 changed files with 439 additions and 26 deletions
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25
src/shared_mutex.cpp
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@@ -15,7 +15,8 @@
_LIBCPP_BEGIN_NAMESPACE_STD
shared_timed_mutex::shared_timed_mutex()
// Shared Mutex Base
__shared_mutex_base::__shared_mutex_base()
: __state_(0)
{
}
@@ -23,7 +24,7 @@ shared_timed_mutex::shared_timed_mutex()
// Exclusive ownership
void
shared_timed_mutex::lock()
__shared_mutex_base::lock()
{
unique_lock<mutex> lk(__mut_);
while (__state_ & __write_entered_)
@@ -34,7 +35,7 @@ shared_timed_mutex::lock()
}
bool
shared_timed_mutex::try_lock()
__shared_mutex_base::try_lock()
{
unique_lock<mutex> lk(__mut_);
if (__state_ == 0)
@@ -46,7 +47,7 @@ shared_timed_mutex::try_lock()
}
void
shared_timed_mutex::unlock()
__shared_mutex_base::unlock()
{
lock_guard<mutex> _(__mut_);
__state_ = 0;
@@ -56,7 +57,7 @@ shared_timed_mutex::unlock()
// Shared ownership
void
shared_timed_mutex::lock_shared()
__shared_mutex_base::lock_shared()
{
unique_lock<mutex> lk(__mut_);
while ((__state_ & __write_entered_) || (__state_ & __n_readers_) == __n_readers_)
@@ -67,7 +68,7 @@ shared_timed_mutex::lock_shared()
}
bool
shared_timed_mutex::try_lock_shared()
__shared_mutex_base::try_lock_shared()
{
unique_lock<mutex> lk(__mut_);
unsigned num_readers = __state_ & __n_readers_;
@@ -82,7 +83,7 @@ shared_timed_mutex::try_lock_shared()
}
void
shared_timed_mutex::unlock_shared()
__shared_mutex_base::unlock_shared()
{
lock_guard<mutex> _(__mut_);
unsigned num_readers = (__state_ & __n_readers_) - 1;
@@ -101,6 +102,16 @@ shared_timed_mutex::unlock_shared()
}
// Shared Timed Mutex
// These routines are here for ABI stability
shared_timed_mutex::shared_timed_mutex() : __base() {}
void shared_timed_mutex::lock() { return __base.lock(); }
bool shared_timed_mutex::try_lock() { return __base.try_lock(); }
void shared_timed_mutex::unlock() { return __base.unlock(); }
void shared_timed_mutex::lock_shared() { return __base.lock_shared(); }
bool shared_timed_mutex::try_lock_shared() { return __base.try_lock_shared(); }
void shared_timed_mutex::unlock_shared() { return __base.unlock_shared(); }
_LIBCPP_END_NAMESPACE_STD
#endif // !_LIBCPP_HAS_NO_THREADS