Imported Upstream version 0.8.1upstream/0.8.1

1 files changed, 73 insertions, 0 deletions

diff --git a/plpa-1.1/src/plpa_runtime.c b/plpa-1.1/src/plpa_runtime.c
new file mode 100644
index 0000000..b5a8c05
--- /dev/null
+++ b/plpa-1.1/src/plpa_runtime.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright (c) 2007 Cisco Systems, Inc.  All rights reserved.
+ */
+
+#include "plpa_config.h"
+#include "plpa.h"
+#include "plpa_internal.h"
+
+#include <errno.h>
+#include <pthread.h>
+
+/* Global variables */
+int PLPA_NAME(initialized) = 0;
+
+/* Local variables */
+static int refcount = 0;
+static pthread_mutex_t mutex;
+
+
+/* Central clearing point for all parts of PLPA that need to be
+   initialized.  It is erroneous to call this function by more than
+   one thread simultaneously. */
+int PLPA_NAME(init)(void)
+{
+    int ret;
+
+    /* If we're already initialized, simply increase the refcount */
+    if (PLPA_NAME(initialized)) {
+        pthread_mutex_lock(&mutex);
+        ++refcount;
+        pthread_mutex_unlock(&mutex);
+        return 0;
+    }
+
+    /* Otherwise, initialize all the sybsystems */
+    if (0 != (ret = pthread_mutex_init(&mutex, NULL)) ||
+        0 != (ret = PLPA_NAME(api_probe_init)()) ||
+        0 != (ret = PLPA_NAME(map_init)())) {
+        return ret;
+    }
+
+    PLPA_NAME(initialized) = 1;
+    refcount = 1;
+    return 0;
+}
+
+
+/* Central clearing point for all parts of PLPA that need to be
+   shutdown. */
+int PLPA_NAME(finalize)(void)
+{
+    int val;
+
+    /* If we're not initialized, return an error */
+    if (!PLPA_NAME(initialized)) {
+        return ENOENT;
+    }
+
+    /* Decrement and check the refcount.  If it's nonzero, then simply
+       return success. */
+    pthread_mutex_lock(&mutex);
+    val = --refcount;
+    pthread_mutex_unlock(&mutex);
+    if (0 != val) {
+        return 0;
+    }
+
+    /* Ok, we're the last one.  Cleanup. */
+    PLPA_NAME(map_finalize)();
+    pthread_mutex_destroy(&mutex);
+    PLPA_NAME(initialized) = 0;
+    return 0;
+}