From 18c086b25d49b7ba812d3b05bb5b5450888e4911 Mon Sep 17 00:00:00 2001
From: danij <danij@dengine.net>
Date: Mon, 29 Aug 2011 18:08:47 +0100
Subject: [PATCH] Implemented Sem_Value for debug; get the current value of a
 semaphore.

---
 doomsday/engine/portable/include/sys_system.h | 10 ++++++++++
 doomsday/engine/portable/src/sys_system.c     | 20 +++++++++----------
 2 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/doomsday/engine/portable/include/sys_system.h b/doomsday/engine/portable/include/sys_system.h
index 874bca5fc8..d60b018324 100644
--- a/doomsday/engine/portable/include/sys_system.h
+++ b/doomsday/engine/portable/include/sys_system.h
@@ -64,7 +64,17 @@ void Sys_Unlock(mutex_t mutexHandle);
 
 sem_t Sem_Create(uint32_t initialValue);
 void Sem_Destroy(sem_t semaphore);
+
+/**
+ * "Proberen" a semaphore. Blocks until the successful.
+ */
 void Sem_P(sem_t semaphore);
+
+/**
+ * "Verhogen" a semaphore. Returns immediately.
+ */
 void Sem_V(sem_t semaphore);
 
+uint32_t Sem_Value(sem_t semaphore);
+
 #endif /* LIBDENG_FILESYS_SYSTEM_H */
diff --git a/doomsday/engine/portable/src/sys_system.c b/doomsday/engine/portable/src/sys_system.c
index f24c98cb2f..40c494ac83 100644
--- a/doomsday/engine/portable/src/sys_system.c
+++ b/doomsday/engine/portable/src/sys_system.c
@@ -375,11 +375,6 @@ void Sys_Unlock(mutex_t handle)
     SDL_mutexV((SDL_mutex *) handle);
 }
 
-/**
- * Create a new semaphore.
- *
- * @return              New handle.
- */
 sem_t Sem_Create(uint32_t initialValue)
 {
     return (sem_t) SDL_CreateSemaphore(initialValue);
@@ -393,9 +388,6 @@ void Sem_Destroy(sem_t semaphore)
     }
 }
 
-/**
- * "Proberen" a semaphore. Blocks until the successful.
- */
 void Sem_P(sem_t semaphore)
 {
     if(semaphore)
@@ -404,9 +396,6 @@ void Sem_P(sem_t semaphore)
     }
 }
 
-/**
- * "Verhogen" a semaphore. Returns immediately.
- */
 void Sem_V(sem_t semaphore)
 {
     if(semaphore)
@@ -414,3 +403,12 @@ void Sem_V(sem_t semaphore)
         SDL_SemPost((SDL_sem *) semaphore);
     }
 }
+
+uint32_t Sem_Value(sem_t semaphore)
+{
+    if(semaphore)
+    {
+        return (uint32_t)SDL_SemValue((SDL_sem*)semaphore);
+    }
+    return 0;
+}