1 files changed, 46 insertions, 1 deletions

diff --git a/src/microhttpd/mhd_locks.h b/src/microhttpd/mhd_locks.h
index cf10c0d1..1d8376f0 100644
--- a/src/microhttpd/mhd_locks.h
+++ b/src/microhttpd/mhd_locks.h
@@ -22,8 +22,9 @@
  * @file microhttpd/mhd_locks.h
  * @brief  Header for platform-independent locks abstraction
  * @author Karlson2k (Evgeny Grin)
+ * @author Christian Grothoff
  *
- * Provides basic abstraction for locks and mutex.
+ * Provides basic abstraction for locks/mutex and semaphores.
  * Any functions can be implemented as macro on some platforms
  * unless explicitly marked otherwise.
  * Any function argument can be skipped in macro, so avoid
@@ -147,4 +148,48 @@
 #define MHD_mutex_unlock_(pmutex) (LeaveCriticalSection((pmutex)), !0)
 #endif
 
+
+/**
+ * A semaphore.
+ */
+struct MHD_Semaphore;
+
+
+/**
+ * Create a semaphore with an initial counter of @a init
+ *
+ * @param init initial counter
+ * @return the semaphore, NULL on error
+ */
+struct MHD_Semaphore *
+MHD_semaphore_create (unsigned int init);
+
+
+/**
+ * Count down the semaphore, block if necessary.
+ *
+ * @param sem semaphore to count down.
+ */
+void
+MHD_semaphore_down (struct MHD_Semaphore *sem);
+
+
+/**
+ * Increment the semaphore.
+ *
+ * @param sem semaphore to increment.
+ */
+void
+MHD_semaphore_up (struct MHD_Semaphore *sem);
+
+
+/**
+ * Destroys the semaphore.
+ *
+ * @param sem semaphore to destroy.
+ */
+void
+MHD_semaphore_destroy (struct MHD_Semaphore *sem);
+
+
 #endif /* ! MHD_LOCKS_H */