diff options
Diffstat (limited to 'lib/libthr/thread/thr_suspend_np.c')
-rw-r--r-- | lib/libthr/thread/thr_suspend_np.c | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/lib/libthr/thread/thr_suspend_np.c b/lib/libthr/thread/thr_suspend_np.c index de95735..fd929ad 100644 --- a/lib/libthr/thread/thr_suspend_np.c +++ b/lib/libthr/thread/thr_suspend_np.c @@ -31,10 +31,14 @@ * * $FreeBSD$ */ + #include <errno.h> #include <pthread.h> + #include "thr_private.h" +static void suspend_common(struct pthread *thread); + __weak_reference(_pthread_suspend_np, pthread_suspend_np); __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np); @@ -42,12 +46,54 @@ __weak_reference(_pthread_suspend_all_np, pthread_suspend_all_np); int _pthread_suspend_np(pthread_t thread) { - /* XXXTHR */ - return (ENOTSUP); + struct pthread *curthread = _get_curthread(); + int ret; + + /* Suspending the current thread doesn't make sense. */ + if (thread == _get_curthread()) + ret = EDEADLK; + + /* Add a reference to the thread: */ + else if ((ret = _thr_ref_add(curthread, thread, /*include dead*/0)) + == 0) { + /* Lock the threads scheduling queue: */ + THR_THREAD_LOCK(curthread, thread); + suspend_common(thread); + /* Unlock the threads scheduling queue: */ + THR_THREAD_UNLOCK(curthread, thread); + + /* Don't forget to remove the reference: */ + _thr_ref_delete(curthread, thread); + } + return (ret); } void _pthread_suspend_all_np(void) { - /* XXXTHR */ + struct pthread *curthread = _get_curthread(); + struct pthread *thread; + + /* Take the thread list lock: */ + THREAD_LIST_LOCK(curthread); + + TAILQ_FOREACH(thread, &_thread_list, tle) { + if (thread != curthread) { + THR_THREAD_LOCK(curthread, thread); + suspend_common(thread); + THR_THREAD_UNLOCK(curthread, thread); + } + } + + /* Release the thread list lock: */ + THREAD_LIST_UNLOCK(curthread); +} + +static void +suspend_common(struct pthread *thread) +{ + if (thread->state != PS_DEAD) { + thread->flags |= THR_FLAGS_NEED_SUSPEND; + _thr_send_sig(thread, SIGCANCEL); + } } |