1 files changed, 116 insertions, 0 deletions
diff --git a/db/os/os_region.c b/db/os/os_region.c
new file mode 100644
index 000000000..1e36fc2cb
--- /dev/null
+++ b/db/os/os_region.c
@@ -0,0 +1,116 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997, 1998, 1999, 2000
+ *	Sleepycat Software.  All rights reserved.
+ */
+
+#include "db_config.h"
+
+#ifndef lint
+static const char revid[] = "$Id: os_region.c,v 11.9 2000/11/30 00:58:42 ubell Exp $";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#endif
+
+#include "db_int.h"
+#include "os_jump.h"
+
+/*
+ * __os_r_attach --
+ *	Attach to a shared memory region.
+ *
+ * PUBLIC: int __os_r_attach __P((DB_ENV *, REGINFO *, REGION *));
+ */
+int
+__os_r_attach(dbenv, infop, rp)
+	DB_ENV *dbenv;
+	REGINFO *infop;
+	REGION *rp;
+{
+	int ret;
+	/* Round off the requested size for the underlying VM. */
+	OS_VMROUNDOFF(rp->size);
+
+#ifdef DB_REGIONSIZE_MAX
+	/* Some architectures have hard limits on the maximum region size. */
+	if (rp->size > DB_REGIONSIZE_MAX) {
+		__db_err(dbenv, "region size %lu is too large; maximum is %lu",
+		    (u_long)rp->size, (u_long)DB_REGIONSIZE_MAX);
+		return (EINVAL);
+	}
+#endif
+
+	/*
+	 * If a region is private, malloc the memory.
+	 *
+	 * !!!
+	 * If this fails because the region is too large to malloc, mmap(2)
+	 * using the MAP_ANON or MAP_ANONYMOUS flags would be an alternative.
+	 * I don't know of any architectures (yet!) where malloc is a problem.
+	 */
+	if (F_ISSET(dbenv, DB_ENV_PRIVATE)) {
+#if defined(MUTEX_NO_MALLOC_LOCKS)
+		/*
+		 * !!!
+		 * There exist spinlocks that don't work in malloc memory, e.g.,
+		 * the HP/UX msemaphore interface.  If we don't have locks that
+		 * will work in malloc memory, we better not be private or not
+		 * be threaded.
+		 */
+		if (F_ISSET(dbenv, DB_ENV_THREAD)) {
+			__db_err(dbenv, "%s",
+    "architecture does not support locks inside process-local (malloc) memory");
+			__db_err(dbenv, "%s",
+    "application may not specify both DB_PRIVATE and DB_THREAD");
+			return (EINVAL);
+		}
+#endif
+		if ((ret =
+		    __os_malloc(dbenv, rp->size, NULL, &infop->addr)) != 0)
+			return (ret);
+#if defined(UMRW) && !defined(DIAGNOSTIC)
+		memset(infop->addr, CLEAR_BYTE, rp->size);
+#endif
+		return (0);
+	}
+
+	/* If the user replaced the map call, call through their interface. */
+	if (__db_jump.j_map != NULL)
+		return (__db_jump.j_map(infop->name,
+		    rp->size, 1, 0, &infop->addr));
+
+	return (__os_r_sysattach(dbenv, infop, rp));
+}
+
+/*
+ * __os_r_detach --
+ *	Detach from a shared memory region.
+ *
+ * PUBLIC: int __os_r_detach __P((DB_ENV *, REGINFO *, int));
+ */
+int
+__os_r_detach(dbenv, infop, destroy)
+	DB_ENV *dbenv;
+	REGINFO *infop;
+	int destroy;
+{
+	REGION *rp;
+
+	rp = infop->rp;
+
+	/* If a region is private, free the memory. */
+	if (F_ISSET(dbenv, DB_ENV_PRIVATE)) {
+		__os_free(infop->addr, rp->size);
+		return (0);
+	}
+
+	/* If the user replaced the map call, call through their interface. */
+	if (__db_jump.j_unmap != NULL)
+		return (__db_jump.j_unmap(infop->addr, rp->size));
+
+	return (__os_r_sysdetach(dbenv, infop, destroy));
+}