On 7 Nov 2011, at 13:45, Jonathan Wakely wrote:
This provides a working thread::hardware_concurrency on platforms that
support pthread_num_processors_np or the "hw.ncpu" sysctl, but by
testing for the features in configure rather than hardcoding OS macro
tests in thread.cc
if the system supports run-time User-controllable core-count then this
will not account for that.
* acinclude.m4 (GLIBCXX_CHECK_SC_NPROC_ONLN): Define.
(GLIBCXX_CHECK_PTHREADS_NUM_PROCESSORS_NP): Define.
(GLIBCXX_CHECK_SYSCTL_HW_NCPU): Define.
* configure.ac: Use new checks.
* configure: Regenerate.
* config.h.in: Regenerate.
* src/thread.cc: Check new config macros.
* testsuite/lib/libstdc++.exp: Likewise.
Tested x86_64-linux and x86_64-netbsd5.1, committed to trunk
<nprocs.patch>
