1 files changed, 141 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_mcpair.c b/sys/dev/raidframe/rf_mcpair.c
new file mode 100644
index 0000000..ff233fe
--- /dev/null
+++ b/sys/dev/raidframe/rf_mcpair.c
@@ -0,0 +1,141 @@
+/*	$FreeBSD$ */
+/*	$NetBSD: rf_mcpair.c,v 1.4 2000/09/11 02:23:14 oster Exp $	*/
+/*
+ * Copyright (c) 1995 Carnegie-Mellon University.
+ * All rights reserved.
+ *
+ * Author: Jim Zelenka
+ *
+ * Permission to use, copy, modify and distribute this software and
+ * its documentation is hereby granted, provided that both the copyright
+ * notice and this permission notice appear in all copies of the
+ * software, derivative works or modified versions, and any portions
+ * thereof, and that both notices appear in supporting documentation.
+ *
+ * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
+ * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
+ * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
+ *
+ * Carnegie Mellon requests users of this software to return to
+ *
+ *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
+ *  School of Computer Science
+ *  Carnegie Mellon University
+ *  Pittsburgh PA 15213-3890
+ *
+ * any improvements or extensions that they make and grant Carnegie the
+ * rights to redistribute these changes.
+ */
+
+/* rf_mcpair.c
+ * an mcpair is a structure containing a mutex and a condition variable.
+ * it's used to block the current thread until some event occurs.
+ */
+
+#include <dev/raidframe/rf_types.h>
+#include <dev/raidframe/rf_threadstuff.h>
+#include <dev/raidframe/rf_mcpair.h>
+#include <dev/raidframe/rf_debugMem.h>
+#include <dev/raidframe/rf_freelist.h>
+#include <dev/raidframe/rf_shutdown.h>
+
+#include <sys/proc.h>
+
+static RF_FreeList_t *rf_mcpair_freelist;
+
+#define RF_MAX_FREE_MCPAIR 128
+#define RF_MCPAIR_INC       16
+#define RF_MCPAIR_INITIAL   24
+
+static int init_mcpair(RF_MCPair_t *);
+static void clean_mcpair(RF_MCPair_t *);
+static void rf_ShutdownMCPair(void *);
+
+
+
+static int 
+init_mcpair(t)
+	RF_MCPair_t *t;
+{
+	int     rc;
+
+	rc = rf_mutex_init(&t->mutex, __FUNCTION__);
+	if (rc) {
+		RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
+		    __LINE__, rc);
+		return (rc);
+	}
+	rc = rf_cond_init(&t->cond);
+	if (rc) {
+		RF_ERRORMSG3("Unable to init cond file %s line %d rc=%d\n", __FILE__,
+		    __LINE__, rc);
+		rf_mutex_destroy(&t->mutex);
+		return (rc);
+	}
+	return (0);
+}
+
+static void 
+clean_mcpair(t)
+	RF_MCPair_t *t;
+{
+	rf_mutex_destroy(&t->mutex);
+	rf_cond_destroy(&t->cond);
+}
+
+static void 
+rf_ShutdownMCPair(ignored)
+	void   *ignored;
+{
+	RF_FREELIST_DESTROY_CLEAN(rf_mcpair_freelist, next, (RF_MCPair_t *), clean_mcpair);
+}
+
+int 
+rf_ConfigureMCPair(listp)
+	RF_ShutdownList_t **listp;
+{
+	int     rc;
+
+	RF_FREELIST_CREATE(rf_mcpair_freelist, RF_MAX_FREE_MCPAIR,
+	    RF_MCPAIR_INC, sizeof(RF_MCPair_t));
+	rc = rf_ShutdownCreate(listp, rf_ShutdownMCPair, NULL);
+	if (rc) {
+		RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n",
+		    __FILE__, __LINE__, rc);
+		rf_ShutdownMCPair(NULL);
+		return (rc);
+	}
+	RF_FREELIST_PRIME_INIT(rf_mcpair_freelist, RF_MCPAIR_INITIAL, next,
+	    (RF_MCPair_t *), init_mcpair);
+	return (0);
+}
+
+RF_MCPair_t *
+rf_AllocMCPair()
+{
+	RF_MCPair_t *t;
+
+	RF_FREELIST_GET_INIT(rf_mcpair_freelist, t, next, (RF_MCPair_t *), init_mcpair);
+	if (t) {
+		t->flag = 0;
+		t->next = NULL;
+	}
+	return (t);
+}
+
+void 
+rf_FreeMCPair(t)
+	RF_MCPair_t *t;
+{
+	RF_FREELIST_FREE_CLEAN(rf_mcpair_freelist, t, next, clean_mcpair);
+}
+/* the callback function used to wake you up when you use an mcpair to wait for something */
+void 
+rf_MCPairWakeupFunc(mcpair)
+	RF_MCPair_t *mcpair;
+{
+	RF_LOCK_MUTEX(mcpair->mutex);
+	mcpair->flag = 1;
+	wakeup(&(mcpair->cond));
+	RF_UNLOCK_MUTEX(mcpair->mutex);
+}