From a6f82b9d63d88072693024404a981b19a5c1e7eb Mon Sep 17 00:00:00 2001
From: "Michael I. Bushnell" <mib@gnu.org>
Date: Tue, 20 Jun 1995 16:31:54 +0000
Subject: Initial revision

---
 libports/manage-multithread.c | 123 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 libports/manage-multithread.c

(limited to 'libports/manage-multithread.c')

diff --git a/libports/manage-multithread.c b/libports/manage-multithread.c
new file mode 100644
index 00000000..767d9ee7
--- /dev/null
+++ b/libports/manage-multithread.c
@@ -0,0 +1,123 @@
+/* 
+   Copyright (C) 1995 Free Software Foundation, Inc.
+   Written by Michael I. Bushnell.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2, or (at
+   your option) any later version.
+
+   The GNU Hurd is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "ports.h"
+#include <spin-lock.h>
+#include <assert.h>
+#include <cthreads.h>
+
+void
+ports_manage_port_operations_multithread (struct port_bucket *bucket,
+					  ports_demuxer_type demuxer,
+					  int thread_timeout,
+					  int global_timeout,
+					  int wire_cthreads,
+					  mach_port_t wire_threads)
+{
+  error_t err;
+  int nreqthreads = 0;
+  int totalthreads = 0;
+  spin_lock_t lock = SPIN_LOCK_INITIALIZER;
+
+  auto void thread_function (int);
+
+  int 
+  internal_demuxer (mach_msg_header_t *inp,
+		    mach_msg_header_t *outp)
+    {
+      int spawn = 0;
+      int status;
+      struct port_info *pi;
+      struct rpc_info link;
+
+      spin_lock (&lock);
+      assert (nreqthreads);
+      nreqthreads--;
+      if (nreqthreads == 0)
+	spawn = 1;
+      spin_unlock (&lock);
+	  
+      if (spawn)
+	cthread_detach (cthread_fork ((cthread_fn_t) thread_function, 0));
+
+      pi = ports_lookup_port (bucket, inp->msgh_local_port, 0);
+      ports_begin_rpc (pi, &link);
+      status = demuxer (inp, outp);
+      ports_end_rpc (pi, &link);
+      ports_port_deref (pi);
+
+      spin_lock (&lock);
+      nreqthreads++;
+      spin_unlock (&lock);
+	  
+      return status;
+    }
+
+  void 
+  thread_function (int master)
+    {
+      int timeout;
+      
+      if (wire_threads)
+	thread_wire (wire_threads, hurd_thread_self (), 1);
+      if (wire_cthreads)
+	cthread_wire ();
+
+      spin_lock (&lock);
+      totalthreads++;
+      nreqthreads++;
+      if (master)
+	timeout = global_timeout;
+      else
+	timeout = thread_timeout;
+      spin_unlock (&lock);
+
+    startover:
+
+      do
+	err = mach_msg_server_timeout (internal_demuxer, 0, bucket->portset,
+				       timeout ? MACH_RCV_TIMEOUT : 0,
+				       timeout);
+      while (err != MACH_RCV_TIMED_OUT);
+      
+      if (master)
+	{
+	  spin_lock (&lock);
+	  if (totalthreads != 1)
+	    goto startover;
+	  return;
+	}
+      else
+	{
+	  spin_lock (&lock);
+	  nreqthreads--;
+	  totalthreads--;
+	  spin_unlock (&lock);
+	  cthread_exit (0);
+	}
+    }
+  
+  thread_function (1);
+}
+
+
+	
+      
+	
-- 
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