diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_suspend_np.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_suspend_np.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_suspend_np.c b/lib/libc_r/uthread/uthread_suspend_np.c new file mode 100644 index 0000000..083f552 --- /dev/null +++ b/lib/libc_r/uthread/uthread_suspend_np.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 1995-1998 John Birrell <jb@cimlogic.com.au>. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by John Birrell. + * 4. Neither the name of the author nor the names of any co-contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ +#include <errno.h> +#ifdef _THREAD_SAFE +#include <pthread.h> +#include "pthread_private.h" + +static void finish_suspension(void *arg); + +/* Suspend a thread: */ +int +pthread_suspend_np(pthread_t thread) +{ + int ret; + + /* Find the thread in the list of active threads: */ + if ((ret = _find_thread(thread)) == 0) { + /* + * Defer signals to protect the scheduling queues from + * access by the signal handler: + */ + _thread_kern_sig_defer(); + + switch (thread->state) { + case PS_RUNNING: + /* + * Remove the thread from the priority queue and + * set the state to suspended: + */ + PTHREAD_PRIOQ_REMOVE(thread); + PTHREAD_SET_STATE(thread, PS_SUSPENDED); + break; + + case PS_SPINBLOCK: + case PS_FDR_WAIT: + case PS_FDW_WAIT: + case PS_POLL_WAIT: + case PS_SELECT_WAIT: + /* + * Remove these threads from the work queue + * and mark the operation as interrupted: + */ + if ((thread->flags & PTHREAD_FLAGS_IN_WORKQ) != 0) + PTHREAD_WORKQ_REMOVE(thread); + _thread_seterrno(thread,EINTR); + thread->interrupted = 1; + + /* FALLTHROUGH */ + case PS_SIGTHREAD: + case PS_SLEEP_WAIT: + case PS_WAIT_WAIT: + case PS_SIGSUSPEND: + case PS_SIGWAIT: + /* + * Remove these threads from the waiting queue and + * set their state to suspended: + */ + PTHREAD_WAITQ_REMOVE(thread); + PTHREAD_SET_STATE(thread, PS_SUSPENDED); + break; + + case PS_MUTEX_WAIT: + /* Mark the thread as suspended and still in a queue. */ + thread->suspended = SUSP_MUTEX_WAIT; + + PTHREAD_SET_STATE(thread, PS_SUSPENDED); + break; + case PS_COND_WAIT: + /* Mark the thread as suspended and still in a queue. */ + thread->suspended = SUSP_COND_WAIT; + + PTHREAD_SET_STATE(thread, PS_SUSPENDED); + break; + case PS_FDLR_WAIT: + case PS_FDLW_WAIT: + case PS_FILE_WAIT: + case PS_JOIN: + /* Mark the thread as suspended: */ + thread->suspended = SUSP_YES; + + /* + * Threads in these states may be in queues. + * In order to preserve queue integrity, the + * cancelled thread must remove itself from the + * queue. Mark the thread as interrupted and + * set the state to running. When the thread + * resumes, it will remove itself from the queue + * and call the suspension completion routine. + */ + thread->interrupted = 1; + _thread_seterrno(thread, EINTR); + PTHREAD_NEW_STATE(thread, PS_RUNNING); + thread->continuation = finish_suspension; + break; + + case PS_DEAD: + case PS_DEADLOCK: + case PS_STATE_MAX: + case PS_SUSPENDED: + /* Nothing needs to be done: */ + break; + } + + /* + * Undefer and handle pending signals, yielding if + * necessary: + */ + _thread_kern_sig_undefer(); + } + return(ret); +} + +static void +finish_suspension(void *arg) +{ + if (_thread_run->suspended != SUSP_NO) + _thread_kern_sched_state(PS_SUSPENDED, __FILE__, __LINE__); +} + + +#endif |
