From 1a8f98c00c2140eac602330559a9d09a7865d26f Mon Sep 17 00:00:00 2001
From: Philip Guenthe <guenther@cvs.openbsd.org>
Date: Sun, 19 Feb 2012 06:47:32 +0000
Subject: Add regress test for stack attributes Disable some tests that
 depended on uthread's particular undefined behavior

---
 regress/lib/libpthread/stack/Makefile |   5 ++
 regress/lib/libpthread/stack/stack.c  | 138 ++++++++++++++++++++++++++++++++++
 2 files changed, 143 insertions(+)
 create mode 100644 regress/lib/libpthread/stack/Makefile
 create mode 100644 regress/lib/libpthread/stack/stack.c

(limited to 'regress/lib/libpthread/stack')

diff --git a/regress/lib/libpthread/stack/Makefile b/regress/lib/libpthread/stack/Makefile
new file mode 100644
index 00000000000..e7be9a885d4
--- /dev/null
+++ b/regress/lib/libpthread/stack/Makefile
@@ -0,0 +1,5 @@
+# $OpenBSD: Makefile,v 1.1 2012/02/19 06:47:31 guenther Exp $
+
+PROG=	stack
+
+.include <bsd.regress.mk>
diff --git a/regress/lib/libpthread/stack/stack.c b/regress/lib/libpthread/stack/stack.c
new file mode 100644
index 00000000000..f7d4fb2d036
--- /dev/null
+++ b/regress/lib/libpthread/stack/stack.c
@@ -0,0 +1,138 @@
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <inttypes.h>
+#include <limits.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include "test.h"
+
+#define LARGE_SIZE	(1024 * 1024)
+
+/* thread main for testing a large buffer on the stack */
+void *
+tmain1(void *arg)
+{
+	char buf[LARGE_SIZE];
+
+	memset(buf, 0xd0, sizeof(buf));
+	return (buf + LARGE_SIZE/2);
+}
+
+/*
+ * struct and thread main for testing that a thread's stack is where
+ * we put it
+ */
+struct st
+{
+	char *addr;
+	size_t size;
+};
+void *
+tmain2(void *arg)
+{
+	struct st *s = arg;
+
+	ASSERT((char *)&s >= s->addr && (char *)&s - s->addr < s->size);
+	return (NULL);
+}
+
+int
+main(void)
+{
+	pthread_attr_t attr;
+	pthread_t t;
+	struct st thread_stack;
+	void *addr, *addr2;
+	size_t size, size2, pagesize;
+	int err;
+
+	pagesize = (size_t)sysconf(_SC_PAGESIZE);
+
+	CHECKr(pthread_attr_init(&attr));
+
+	/* verify that the initial values are what we expect */
+	size = 1;
+	CHECKr(pthread_attr_getguardsize(&attr, &size));
+	ASSERT(size != 1);		/* must have changed */
+	ASSERT(size != 0);		/* we default to having a guardpage */
+
+	size = 1;
+	CHECKr(pthread_attr_getstacksize(&attr, &size));
+	ASSERT(size >= PTHREAD_STACK_MIN);
+
+	addr = &addr;
+	CHECKr(pthread_attr_getstackaddr(&attr, &addr));
+	ASSERT(addr == NULL);		/* default must be NULL */
+
+	addr2 = &addr;
+	size2 = 1;
+	CHECKr(pthread_attr_getstack(&attr, &addr2, &size2));
+	ASSERT(addr2 == addr);		/* must match the other calls */
+	ASSERT(size2 == size);
+
+	/* verify that too small a size is rejected */
+	err = pthread_attr_setstacksize(&attr, PTHREAD_STACK_MIN - 1);
+	ASSERT(err == EINVAL);
+	CHECKr(pthread_attr_getstacksize(&attr, &size2));
+	ASSERT(size2 == size);
+
+
+	/*
+	 * increase the stacksize, then verify that the change sticks,
+	 * and that a large buffer fits on the resulting thread's stack
+	 */
+	size2 += LARGE_SIZE;
+	CHECKr(pthread_attr_setstacksize(&attr, size2));
+	CHECKr(pthread_attr_getstacksize(&attr, &size));
+	ASSERT(size == size2);
+
+	CHECKr(pthread_create(&t, &attr, &tmain1, NULL));
+	sleep(1);
+	CHECKr(pthread_join(t, &addr));
+
+	/* test whether the stack has been freed */
+	/* XXX yow, this is grossly unportable, as it depends on the stack
+	 * not being cached, the thread being marked freeable before
+	 * pthread_join() calls the gc routine (thus the sleep), and this
+	 * being testable by mquery */
+	addr = (void *)((uintptr_t)addr & ~(pagesize - 1));
+	ASSERT(mquery(addr, pagesize, PROT_READ, MAP_FIXED|MAP_ANON, -1, 0)
+	    == addr);
+
+	/* the attr wasn't modified by pthread_create, right? */
+	size = 1;
+	CHECKr(pthread_attr_getstacksize(&attr, &size));
+	ASSERT(size == size2);
+
+
+	/* allocate our own stack and verify the thread uses it */
+	size = pagesize * 4;
+	addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE,
+	    -1, 0);
+	ASSERT(addr != MAP_FAILED);
+	memset(addr, 0xd0, size);
+	CHECKr(pthread_attr_setstack(&attr, addr, size));
+
+	CHECKr(pthread_attr_getstacksize(&attr, &size2));
+	ASSERT(size2 == size);
+	CHECKr(pthread_attr_getstackaddr(&attr, &addr2));
+	ASSERT(addr2 == addr);
+	CHECKr(pthread_attr_getstack(&attr, &addr2, &size2));
+	ASSERT(addr2 == addr);
+	ASSERT(size2 == size);
+
+	thread_stack.addr = addr;
+	thread_stack.size = size;
+	CHECKr(pthread_create(&t, &attr, &tmain2, &thread_stack));
+	sleep(1);
+	CHECKr(pthread_join(t, NULL));
+
+	/* verify that the stack we allocated was *not* freed */
+	memset(addr, 0xd0, size);
+
+	return (0);
+}
-- 
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