enable malloc_duel; "tests want to run" bluhm@

link pthread_rwlock2 test

Add regress test for cancellation of pthread_once()'s init_routine

From Scott Cheloha (scottcheloha (at) gmail.com)

Remove all references to "make depend" from regress.

Test that various calls can be interrupted in a non-threaded process,
then dlopen() libpthread and do that again in a second thread,
and then verify that they're all correctly acting as cancellation

Test that various calls can be interrupted in a non-threaded process,
then dlopen() libpthread and do that again in a second thread,
and then verify that they're all correctly acting as cancellation points.

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Add regress for cancellation of wait/waitpid/wait3/wait4

Enter the REGRESS_FULL target subdirs for clean, cleandir and obj targets.

Some tests are currently failing. Only run those if the REGRESS_FULL
variable is set.

Add earlysig test to check whether the pthread fork() wrapper
has a critical section where getting a signal causes a hang. Based on
otto@ earlysig kernel regress; suggested by miod@

Disable the blocked_{close,dup2,fifo} tests, as we know they fail

temporarily fix the static tests in testall by using NOPIE_LDFLAGS.

document some more disabled tests.

Add pthread spinlock support.

Implementation, documentation and naive regression tests for:
- pthread_spin_init()
- pthread_spin_destroy()
- pthread_spin_lock()
- pthread_spin_trylock()
- pthread_sp

Add pthread spinlock support.

Implementation, documentation and naive regression tests for:
- pthread_spin_init()
- pthread_spin_destroy()
- pthread_spin_lock()
- pthread_spin_trylock()
- pthread_spin_unlock()

Implementation okay guenther@, documentation okay jmc@.

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Remove suspend_np1 from regress build.

Add a simple barrier regression test.

Add blocked_fifo.

Add pthread_suspend_np regress test. okay guenther@

- remove invalid potions of blocked_* regress tests
- reenable blocked_* regress tests. while this behaivor
is not specifited by posix, deadlocking is not a reasonable
behaivor and some ports dep

- remove invalid potions of blocked_* regress tests
- reenable blocked_* regress tests. while this behaivor
is not specifited by posix, deadlocking is not a reasonable
behaivor and some ports depend on this to work.

show more ...

Disable the dup2_race test, as it requires a buggy behavior that uthreads
happened to exhibit

Enable the errno test; add a quick rwlocks test

Add regress test for stack attributes
Disable some tests that depended on uthread's particular undefined behavior

link new semaphore tests

enter signals.

first round of tests to check system calls restarting with pthreads.
guenther@ ok

Use CHECKx macro and enable setsockopt tests.