From 9f3f278ae8e7d4b2daa5ca8d331bca70bb550c76 Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 28 Jul 2013 14:21:20 +0200
Subject: [PATCH] sem.c: Fix P() for negative start values.

---
 src/sem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/sem.c b/src/sem.c
index 0df93c6..ee03e0b 100644
--- a/src/sem.c
+++ b/src/sem.c
@@ -69,7 +69,7 @@ int sem_del(SEM *sem) {
 
 void P(SEM *sem) {
     pthread_mutex_lock(&sem->mutex);
-    while (sem->value == 0) {
+    while (sem->value <= 0) {
         pthread_cond_wait(&sem->condition, &sem->mutex);
     }
     sem->value--;
-- 
2.44.1