Merge branch 'dde' of git.savannah.gnu.org:/srv/git/hurd/incubator into dde

1 files changed, 50 insertions, 0 deletions

diff --git a/libddekit/ddekit/semaphore.h b/libddekit/ddekit/semaphore.h
new file mode 100644
index 00000000..c959919d
--- /dev/null
+++ b/libddekit/ddekit/semaphore.h
@@ -0,0 +1,50 @@
+#ifndef _ddekit_semaphore_h
+#define _ddekit_semaphore_h
+
+/** \defgroup DDEKit_synchronization */
+
+struct ddekit_sem;
+typedef struct ddekit_sem ddekit_sem_t;
+
+/** Initialize DDEKit semaphore.
+ *
+ * \ingroup DDEKit_synchronization
+ *
+ * \param value  initial semaphore counter
+ */
+ddekit_sem_t *ddekit_sem_init(int value);
+
+/** Uninitialize semaphore.
+ *
+ * \ingroup DDEKit_synchronization
+ */
+void ddekit_sem_deinit(ddekit_sem_t *sem);
+
+/** Semaphore down method. */
+void ddekit_sem_down(ddekit_sem_t *sem);
+
+/** Semaphore down method, non-blocking.
+ *
+ * \ingroup DDEKit_synchronization
+ *
+ * \return 0   success
+ * \return !=0 would block
+ */
+int  ddekit_sem_down_try(ddekit_sem_t *sem);
+
+/** Semaphore down with timeout.
+ *
+ * \ingroup DDEKit_synchronization
+ *
+ * \return 0   success
+ * \return !=0 would block
+ */
+int  ddekit_sem_down_timed(ddekit_sem_t *sem, int timo);
+
+/** Semaphore up method. 
+ *
+ * \ingroup DDEKit_synchronization
+ */
+void ddekit_sem_up(ddekit_sem_t *sem);
+
+#endif