diff options
Diffstat (limited to 'lib/libc_r/uthread/uthread_sig.c')
| -rw-r--r-- | lib/libc_r/uthread/uthread_sig.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/lib/libc_r/uthread/uthread_sig.c b/lib/libc_r/uthread/uthread_sig.c new file mode 100644 index 0000000..77ec713 --- /dev/null +++ b/lib/libc_r/uthread/uthread_sig.c @@ -0,0 +1,128 @@ +/* + * Copyright (c) 1995 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 REGENTS 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. + * + */ +#include <signal.h> +#include <errno.h> +#ifdef _THREAD_SAFE +#include <pthread.h> +#include "pthread_private.h" + +void +_thread_sig_handler(int sig, int code, struct sigcontext * scp) +{ + char c; + pthread_t pthread; + + /* + * Check if the pthread kernel has unblocked signals (or is about to) + * and was on its way into a _thread_sys_select when the current + * signal interrupted it: + */ + if (_thread_kern_in_select) { + /* Cast the signal number to a character variable: */ + c = sig; + + /* + * Write the signal number to the kernel pipe so that it will + * be ready to read when this signal handler returns. This + * means that the _thread_sys_select call will complete + * immediately. + */ + if (_thread_sys_write(_thread_kern_pipe[1], &c, 1) != 1) { + } + } + /* Check if the signal requires a dump of thread information: */ + if (sig == SIGINFO) { + /* Dump thread information to file: */ + _thread_dump_info(); + } else { + /* Handle depending on signal type: */ + switch (sig) { + /* Interval timer used for timeslicing: */ + case SIGVTALRM: + /* + * Don't add the signal to any thread. Just want to + * call + */ + /* the scheduler: */ + break; + + /* Signals specific to the running thread: */ + case SIGBUS: + case SIGEMT: + case SIGFPE: + case SIGILL: + case SIGPIPE: + case SIGSEGV: + case SIGSYS: + /* Add the signal to the set of pending signals: */ + _thread_run->sigpend[sig] += 1; + break; + + /* Signals to send to all threads: */ + default: + /* + * Enter a loop to process each thread in the linked + * list: + */ + for (pthread = _thread_link_list; pthread != NULL; + pthread = pthread->nxt) { + /* + * Add the signal to the set of pending + * signals: + */ + pthread->sigpend[sig] += 1; + } + break; + } + + /* Check if the kernel is not locked: */ + if (_thread_run != &_thread_kern_thread) { + /* + * Schedule the next thread. This function is not + * expected to return because it will do a longjmp + * instead. + */ + _thread_kern_sched(scp); + + /* + * This point should not be reached, so abort the + * process: + */ + PANIC("Returned to signal function from scheduler"); + } + } + + /* Returns nothing. */ + return; +} +#endif |
