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authorpooka <pooka@NetBSD.org>2014-12-16 20:05:54 +0000
committerpooka <pooka@NetBSD.org>2014-12-16 20:05:54 +0000
commitbc59b09d1a686ba7cf74307c2ff244ba6a094cf6 (patch)
treefd43f80c26325ccf4590175694c5191500a08b39 /lib/libpthread/pthread_makelwp.h
parentb3ead97fcc4f83d232e3b3e669a4728a8d2ebc62 (diff)
Allow for arbitrary MI scheduler implementations.
A concrete result is enabling unpatched libpthread to run on the rumprun stacks (e.g. Xen and bare metal) with a non-NetBSD scheduler. Those schedulers hook into the existing _lwp_frobnitz() NetBSD syscall interfaces (well, "syscall" interfaces in that scenario ;) More specifically about the change itself: 1) instead of calling _lwp_makecontext() followed by _lwp_create() and passing the entry point in ucontext_t (MD) through the calls, roll the calls into pthread__makelwp() and allow alternate implementations for that MI interface. 2) allow compile-time overriding of __lwp_gettcb_fast() or __lwp_getprivate_fast, which are inline and leak MD scheduler/thread details into libpthread Additionally, two small nits: I) define LIB=pthread before including mk.conf so that it's possible to test for LIB==pthread in mk.conf II) make it possible to leave out pthread_cancelstub.c. This is required by the current implementation of rumprun-posix (i.e. rumprun on POSIX hosts) due to symbol collisions. It needs to be fixed properly some day, but for now allows an almost-correct libpthread to run. I am sure @justin will be happy to explain the details ;) no change to NetBSD tested: anita+atf
Diffstat (limited to 'lib/libpthread/pthread_makelwp.h')
-rw-r--r--lib/libpthread/pthread_makelwp.h46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/libpthread/pthread_makelwp.h b/lib/libpthread/pthread_makelwp.h
new file mode 100644
index 00000000000..27b79ba075f
--- /dev/null
+++ b/lib/libpthread/pthread_makelwp.h
@@ -0,0 +1,46 @@
+/* $NetBSD: pthread_makelwp.h,v 1.1 2014/12/16 20:05:54 pooka Exp $ */
+
+/*-
+ * Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Nathan J. Williams and Andrew Doran.
+ *
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ */
+
+#ifndef _LIB_PTHREAD_MAKELWP_H_
+#define _LIB_PTHREAD_MAKELWP_H_
+
+#include <sys/param.h>
+
+#include <lwp.h>
+
+/* for PTHREAD_HIDE */
+#include <pthread.h>
+#include "pthread_int.h"
+
+int pthread__makelwp(void (*)(void *), void *, void *, void *, size_t,
+ unsigned long, lwpid_t *) PTHREAD_HIDE;
+
+#endif /* _LIB_PTHREAD_MAKELWP_H_ */