src/lib/libthr, branch release/9.0.0

MFC r227604:

2011-11-23T11:59:01Z

Pass CVWAIT flags to kernel, this should handle Timeout correctly for pthread_cond_timedwait when it uses kernel-based condition variable. Approved by: re (kib)

Do not set thread name to less than informative 'initial thread'.

2011-06-19T13:35:36Z

Merge from r161730:

2011-06-18T11:07:09Z

o Set TP using inline assembly to avoid dead code elimination. o Eliminate _tcb. Merge from r161840: Stylize: avoid using a global register variable. Merge from r157461: Simplify _get_curthread() and _tcb_ctor because libc and rtld now already allocate thread pointer space in tls block for initial thread. Merge from r177853: Replace function _umtx_op with _umtx_op_err, the later function directly returns errno, because errno can be mucked by user's signal handler and most of pthread api heavily depends on errno to be correct, this change should improve stability of the thread library. MFC after: 1 week

r179417 introduced a bug into pthread_once(). Previously pthread_once()

2011-04-20T14:19:34Z

used a global pthread_mutex_t for synchronization. r179417 replaced that with an implementation that directly used atomic instructions and thr_* syscalls to synchronize callers to pthread_once. However, calling pthread_mutex_lock on the global mutex implicitly ensured that _thr_check_init() had been called but with r179417 this was no longer guaranteed. This meant that if you were unlucky enough to have your first call into libthr be a call to pthread_once(), you would segfault when trying to access the pointer returned by _get_curthread(). The fix is to explicitly call _thr_check_init() from pthread_once(). Reviewed by: davidxu Approved by: emaste (mentor) MFC after: 1 week

Introduce a non-portable function pthread_getthreadid_np(3) to retrieve

2011-02-07T21:26:46Z

calling thread's unique integral ID, which is similar to AIX function of the same name. Bump __FreeBSD_version to note its introduction. Reviewed by: kib

Fix a typo.

2011-01-11T01:57:02Z

Submitted by: avg

For the process that already loaded libthr but still not initialized

2011-01-10T16:10:25Z

threading, fall back to libc method of performing __pthread_map_stacks_exec() job. Reported and tested by: Mykola Dzham

Implement the __pthread_map_stacks_exec() for libthr.

2011-01-09T12:38:40Z
Stack creation code is changed to call _rtld_get_stack_prot() to get the stack protection right. There is a race where thread is created during dlopen() of dso that requires executable stacks. Then, _rtld_get_stack_prot() may return PROT_READ | PROT_WRITE, but thread is still not linked into the thread list. In this case, the callback misses the thread stack, and rechecks the required protection afterward. Reviewed by: davidxu

Add section .note.GNU-stack for assembly files used by 386 and amd64.

2011-01-07T16:09:33Z

Return 0 instead of garbage value.

2011-01-06T08:13:30Z
Found by: clang static analyzer