Reviewed by: julian

Submitted by:	 john birrel

One version of the pthreads library
another will follow with differnt actions under some cases..
not QUITE complete

1 files changed, 128 insertions, 0 deletions

diff --git a/lib/libpthread/thread/thr_sig.c b/lib/libpthread/thread/thr_sig.c
new file mode 100644
index 0000000..77ec713
--- /dev/null
+++ b/lib/libpthread/thread/thr_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