Disabled external gits

cs453-ca/CS453-2021-project/sync-examples/lock.c

@@ -0,0 +1,27 @@
+#include "lock.h"
+
+bool lock_init(struct lock_t* lock) {
+    return pthread_mutex_init(&(lock->mutex), NULL) == 0
+        && pthread_cond_init(&(lock->cv), NULL) == 0;
+}
+
+void lock_cleanup(struct lock_t* lock) {
+    pthread_mutex_destroy(&(lock->mutex));
+    pthread_cond_destroy(&(lock->cv));
+}
+
+bool lock_acquire(struct lock_t* lock) {
+    return pthread_mutex_lock(&(lock->mutex)) == 0;
+}
+
+void lock_release(struct lock_t* lock) {
+    pthread_mutex_unlock(&(lock->mutex));
+}
+
+void lock_wait(struct lock_t* lock) {
+    pthread_cond_wait(&(lock->cv), &(lock->mutex));
+}
+
+void lock_wake_up(struct lock_t* lock) {
+    pthread_cond_broadcast(&(lock->cv));
+}