From 62024711e10c2b27e097e0e8876689ae6187e28d Mon Sep 17 00:00:00 2001
From: Owen Shepherd <owen.shepherd@e43.eu>
Date: Thu, 27 Dec 2012 00:29:19 +0000
Subject: [PATCH] opt/nothread: add support for recursion

---
 opt/nothread/mtx_lock.c    | 6 ++----
 opt/nothread/mtx_trylock.c | 8 ++------
 opt/nothread/mtx_unlock.c  | 7 +++----
 3 files changed, 7 insertions(+), 14 deletions(-)

diff --git a/opt/nothread/mtx_lock.c b/opt/nothread/mtx_lock.c
index d086986..efe26bd 100644
--- a/opt/nothread/mtx_lock.c
+++ b/opt/nothread/mtx_lock.c
@@ -3,10 +3,8 @@
 
 int mtx_lock(mtx_t *mtx)
 {
-	if(*mtx == 0) {
-		*mtx = 1;
-		return thrd_success;
-	} else return thrd_error;
+	(*mtx)++;
+	return thrd_success;
 }
 #endif
 
diff --git a/opt/nothread/mtx_trylock.c b/opt/nothread/mtx_trylock.c
index bffc8b8..20efc99 100644
--- a/opt/nothread/mtx_trylock.c
+++ b/opt/nothread/mtx_trylock.c
@@ -3,12 +3,8 @@
 
 int mtx_trylock(mtx_t *mtx)
 {
-	if(*mtx) {
-		return thrd_error;
-	} else {
-		*mtx = 1;
-		return thrd_success;
-	}
+	(*mtx)++;
+	return thrd_success;
 }
 #endif
 
diff --git a/opt/nothread/mtx_unlock.c b/opt/nothread/mtx_unlock.c
index 214a063..97a93a6 100644
--- a/opt/nothread/mtx_unlock.c
+++ b/opt/nothread/mtx_unlock.c
@@ -3,10 +3,9 @@
 
 int mtx_unlock(mtx_t *mtx)
 {
-	if(*mtx) {
-		*mtx = 0;
-		return thrd_success;
-	} else return thrd_error;
+	if(--(*mtx) >= 0)
+        return thrd_success;
+    return thrd_error;
 }
 #endif
 
-- 
2.40.0