Build without sys/sa.h present.

Fix bugs with and improve upon previous.

Conditionalised support for 1:1 threads. Needs associated kernel changes
and more work to be useful.

remove unused IDLESPINS.

starting the pthread library (ie. calling pthread__start()) before
any threads are created turned out to be not such a good idea.
there are stronger requirements on what has to work in a forked child

starting the pthread library (ie. calling pthread__start()) before
any threads are created turned out to be not such a good idea.
there are stronger requirements on what has to work in a forked child
while a process is still single-threaded. so take all that stuff
back out and fix the problems with single-threaded programs that
are linked with libpthread differently, by checking if the library
has been started and doing completely different stuff if it hasn't been:
- for pthread_rwlock_timedrdlock(), just fail with EDEADLK immediately.
- for sem_wait(), the only thing that can unlock the semaphore is a
signal handler, so use sigsuspend() to wait for a signal.
- for pthread_mutex_lock_slow(), just go into an infinite loop
waiting for signals.

I also noticed that there's a "sem2" test that has never worked in its
single-threaded form. the problem there is that a signal handler tries
to take a sem_t interlock which is already held when the signal is received.
fix this too, by adding a single-threaded case for sig_trywait() that
blocks signals instead of using the userland interlock.

show more ...

in pthread_mutex_lock_slow(), pthread_rwlock_timedrdlock() and sem_wait(),
call pthread__start() if it hasn't already been called. this avoids
an internal assertion from the library if these routine

in pthread_mutex_lock_slow(), pthread_rwlock_timedrdlock() and sem_wait(),
call pthread__start() if it hasn't already been called. this avoids
an internal assertion from the library if these routines are used
before any threads are created and they need to sleep.
fixes PR 20256, PR 24241, PR 25722, PR 26096.

show more ...

Keep the kernel updated with signal action signal masks (act.sa_mask) until
threads are started, since before that the traditional signal invocation
method will be used. Fixes regress/lib/libpthread/

Keep the kernel updated with signal action signal masks (act.sa_mask) until
threads are started, since before that the traditional signal invocation
method will be used. Fixes regress/lib/libpthread/sigmask2.

show more ...

Remove pt_blockuc. If the debugger attempts to muck with the state of a
blocked thread, return an error; this should be done through ptrace(2).

Local whitespace police.

Add a flag that indicates that a thread took a signal.

const'ify the arguments to pthread__assertfunc and _errorfunc;
needed because the __func__ pseudo-var is strictly "const*" in gcc-3.4

add libpthread part of concurrency support for SA on MP systems
- enable concurrency according to environment variable PTHREAD_CONCURRENCY
- add idle VP wakeup if there are additional jobs and idle V

add libpthread part of concurrency support for SA on MP systems
- enable concurrency according to environment variable PTHREAD_CONCURRENCY
- add idle VP wakeup if there are additional jobs and idle VPs
- make reidlequeue per VP
- enable spinning for locks
- fix race condition in alarm processing
- fix race condition in mutex locking
- make debugging output line buffered and add VP prefix to debug lines

show more ...

Rename pt_stacksize, pt_stacksize_lg, and pt_stackmask to pthread_*. External
symbols can't start with pt_, as that is in the application namespace.

userland part of no-syscall upcall stack return

- add pt_stackinfo to struct __pthread_st
- add pthread__stackinfo_offset returning the offset from ss_sp to
pt_stackinfo
- pass stackinfo_offset to

userland part of no-syscall upcall stack return

- add pt_stackinfo to struct __pthread_st
- add pthread__stackinfo_offset returning the offset from ss_sp to
pt_stackinfo
- pass stackinfo_offset to sa_register and set SA_FLAG_STACKINFO to
make the kernel use it
- call pthread__sa_recycle in pthread__resolve_locks; g/c recycleq and
pthread__recycle_bulk
- return stack in pthread__sa_recycle by incrementing sasi_stackgen
- make pthread__sa_recycle debugging output formatting conditional on
pthread__debug_newline

show more ...

Handle block/unblock for threads in critical section without
sa_unblockyield.

XXX g/c sa_unblockyield in kernel later

Set default stack size to the current limit on the stack size as set
with the shell's command to change limits. Make the PTHREAD_STACKSIZE
environment variable override the default stack size. The

Set default stack size to the current limit on the stack size as set
with the shell's command to change limits. Make the PTHREAD_STACKSIZE
environment variable override the default stack size. The old fixed
stack size behaviour can be enable with PT_FIXEDSTACKSIZE_LG when building
libpthread.

show more ...

GC sigcontext<->mcontext code and __HAVE_SIGINFO. All supported archs have
siginfo implemented.

Add:

int pthread_attr_setcreatesuspend_np(pthread_attr_t *);
int pthread_suspend_np(pthread_t);
int pthread_resume_np(pthread_t);

needed for java. Approved and fixed by cl.

convert to use siginfo/ucontext style of signal delivery instead of
sigcontext. Approved by nathanw.

Remove possible race condition in upcall recycling.

Add a lock on the pt_flags field.

pthread.c was getting a bit unwieldly. Move pthread_attr stuff out
into a new file, and put the shared private structure definition in
pthread_int.h.

Adapt to internal structure name changes.

Add a couple of useful flags and symbols.

Introduce a new pointer, pt_trapuc, that stores thread context captured
by the kernel. Separating this from pt_uc makes it possible to avoid a race
condition in pt_uc management near the STACK_SWITCH

Introduce a new pointer, pt_trapuc, that stores thread context captured
by the kernel. Separating this from pt_uc makes it possible to avoid a race
condition in pt_uc management near the STACK_SWITCH part of pthread__switch()
and pthread__locked_switch().

Remove pt_sleepuc pointer, which was made obsolete by the previous round of
UC juggling but still present in the assembler files.

show more ...

Tiny bit of infrastructure for ABI-supported thread-ID storage.