core: added lt_dlinit(), lt_dlexit() [global reference-counting].

1 files changed, 40 insertions, 0 deletions

diff --git a/src/core/lt_core.c b/src/core/lt_core.c
new file mode 100644
index 0000000..b0c3952
--- /dev/null
+++ b/src/core/lt_core.c
@@ -0,0 +1,40 @@
+/*******************************************************************/
+/*  sltdl: a surrogate ltdl implementation                         */
+/*  Copyright (C) 2019 Z. Gilboa                                   */
+/*  Released under the Standard MIT License; see COPYING.SLTDL.    */
+/*******************************************************************/
+
+#include <limits.h>
+#include <pthread.h>
+#include <sltdl/sltdl.h>
+
+static int             lt_refs = 0;
+static pthread_mutex_t lt_lock = PTHREAD_MUTEX_INITIALIZER;
+
+int lt_dlinit(void)
+{
+	if (pthread_mutex_lock(&lt_lock))
+		return 1;
+
+	lt_refs++;
+	pthread_mutex_unlock(&lt_lock);
+
+	return 0;
+}
+
+int lt_dlexit(void)
+{
+	if (pthread_mutex_lock(&lt_lock))
+		return 1;
+
+	if (!lt_refs) {
+		pthread_mutex_unlock(&lt_lock);
+		return 1;
+	}
+
+	lt_refs--;
+
+	pthread_mutex_unlock(&lt_lock);
+
+	return 0;
+}