mcs-lock: driver bugfix (deadlocking)

I didn't notice that the guard automatically locks/unlocks the mutex on
creation/destruction, respectively.

diff --git a/mcs-lock/mcs-lock.cc b/mcs-lock/mcs-lock.cc
index a541a2e4d919c0229234e5a38a2daba8ddef4bf1..26e5a27edb76da058cc352eabd5c300a8fdb0ca8 100644 (file)
--- a/mcs-lock/mcs-lock.cc
+++ b/mcs-lock/mcs-lock.cc
@@ -12,18 +12,14 @@ static uint32_t shared;
 void threadA(void *arg)
 {
        mcs_mutex::guard g(mutex);
-       mutex->lock(&g);
        printf("store: %d\n", 17);
        store_32(&shared, 17);
-       mutex->unlock(&g);
 }
 
 void threadB(void *arg)
 {
        mcs_mutex::guard g(mutex);
-       mutex->lock(&g);
        printf("load: %u\n", load_32(&shared));
-       mutex->unlock(&g);
 }
 
 int user_main(int argc, char **argv)