at basic locking/threading support

git-svn-id: file:///home/lennart/svn/public/libsydney/trunk@26 9ba3c220-e4d3-45a2-8aa3-73fcc9aff6ce

1 files changed, 17 insertions, 0 deletions

diff --git a/once.h b/once.h
new file mode 100644
index 0000000..a374529
--- /dev/null
+++ b/once.h
@@ -0,0 +1,17 @@
+#ifndef foosydneyoncehfoo
+#define foosydneyoncehfoo
+
+#include "mutex.h"
+
+typedef struct sa_once {
+    unsigned int once_value;
+    sa_mutex_t *mutex;
+} sa_once_t;
+
+#define SA_ONCE_INIT { .once_value = 0, .mutex = NULL }
+
+typedef void (*sa_once_func_t) (void);
+
+int sa_once(sa_once_t *o, sa_once_func_t f);
+
+#endif