First pass on the stackless task class - mainly a bunch of #defines for now.

1 files changed, 68 insertions, 0 deletions

diff --git a/includes/StacklessTask.h b/includes/StacklessTask.h
new file mode 100644
index 0000000..ca5d521
--- /dev/null
+++ b/includes/StacklessTask.h
@@ -0,0 +1,68 @@
+#pragma once
+
+#include <Task.h>
+
+namespace Balau {
+
+class StacklessTask : public Task {
+  public:
+      StacklessTask() : m_state(0) { setStackless(); }
+  protected:
+    void taskSwitch() throw (GeneralException) { throw TaskSwitch(); }
+    unsigned int m_state;
+};
+
+};
+
+#define StacklessBegin() \
+    switch(m_state) { \
+    case 0: { \
+
+
+#define StacklessOperation(operation) \
+        m_state = __LINE__; \
+    } \
+    case __LINE__: { \
+        try { \
+            operation; \
+        } \
+        catch (Balau::EAgain & e) { \
+            auto evt = e.getEvent(); \
+            waitFor(evt); \
+            taskSwitch(); \
+        } \
+
+
+#define StacklessWaitFor(evt) \
+        m_state = __LINE__; \
+        waitFor(evt); \
+        taskSwitch(); \
+    } \
+    case __LINE__: { \
+
+
+#define StacklessWait(cond) \
+        m_state = __LINE__; \
+    } \
+    case __LINE__: { \
+        if (!(cond)) \
+            taskSwitch(); \
+
+
+#define StacklessYield() \
+        m_state = __LINE__; \
+        try { \
+            yield(true); \
+        } \
+        catch (Balau::EAgain & e) { \
+            taskSwitch(); \
+        } \
+    } \
+    case __LINE__: { \
+
+
+#define StacklessEnd() \
+    } \
+    default: \
+        AssertHelper("unknown state", "State %i is out of range in task %s at %p", m_state, getName(), this); \
+    }