fooo

sync/semaphore.cc

@@ -1,7 +1,29 @@
 #include "./semaphore.h"
+#include "../interrupt/guard.h"
+#include "../thread/scheduler.h"
+uint8_t counter;
+Queue<Thread> waiting;
+Semaphore::Semaphore(unsigned c) {
+  counter=c;
+}
 
-Semaphore::Semaphore(unsigned c) { (void)c; }
 
-void Semaphore::p(Vault &vault) { (void)vault; }
+void Semaphore::p(Vault &vault) { 
+  //resource is frei, läuft direkt weiter
+  if (vault.counter > 0)
+    vault.counter--;
+  //else
+  /// thread block, zu aktueller queue hinzufügen und 
+//    vault.sch.block(this);
+}
+
+//release
+void Semaphore::v(Vault &vault) { 
+  //Thread* first = waiting.dequeue();
+  //if (first != nullptr)
+  //  void Scheduler::wakeup(first);
+  //else
+    vault.counter++;
+}
+
 
-void Semaphore::v(Vault &vault) { (void)vault; }