On 16/01/15 14:12 +0100, Torvald Riegel wrote:
[Resend. Sorry for the noise on gcc@.]
This adds a POSIX-based implementation of shared_timed_mutex, using
pthread_rwlock_* operations directly instead of implementing with
mutexes and two condvars. This enables using an optimized
pthread_rwlock_t on POSIX.
Tested on x86_64-linux.
OK?
OK for trunk - thanks.
diff --git a/libstdc++-v3/include/std/shared_mutex
b/libstdc++-v3/include/std/shared_mutex
index 8bfede3..643768c 100644
--- a/libstdc++-v3/include/std/shared_mutex
+++ b/libstdc++-v3/include/std/shared_mutex
@@ -57,6 +57,188 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
/// shared_timed_mutex
class shared_timed_mutex
{
+#if defined(__GTHREADS_CXX0X)
N.B. I advised Torvald that this macro was OK to check that we have
pthread_rwlock_t available. It's not strictly correct, but currently
only gthr-posix.h defines __GTHREADS_CXX0X so it works in practice. We
should come up with something better at a later date though, or if any
other gthreads model ever supports C++11 threads.
