qxl: stop direct access to DisplaySurface fields.

[qemu.git] / qemu-coroutine.h

diff --git a/qemu-coroutine.h b/qemu-coroutine.h
index 2f2fd9555236e275c1aa7d213dd89e71b75777a4..34c15d41169ebb3aab061861c593ac60b4b58b51 100644 (file)
--- a/qemu-coroutine.h
+++ b/qemu-coroutine.h
@@ -17,6 +17,7 @@
 
 #include <stdbool.h>
 #include "qemu-queue.h"
+#include "qemu-timer.h"
 
 /**
  * Coroutines are a mechanism for stack switching and can be used for
@@ -117,6 +118,12 @@ void qemu_co_queue_init(CoQueue *queue);
  */
 void coroutine_fn qemu_co_queue_wait(CoQueue *queue);
 
+/**
+ * Adds the current coroutine to the head of the CoQueue and transfers control to the
+ * caller of the coroutine.
+ */
+void coroutine_fn qemu_co_queue_wait_insert_head(CoQueue *queue);
+
 /**
  * Restarts the next coroutine in the CoQueue and removes it from the queue.
  *
@@ -124,6 +131,11 @@ void coroutine_fn qemu_co_queue_wait(CoQueue *queue);
  */
 bool qemu_co_queue_next(CoQueue *queue);
 
+/**
+ * Restarts all coroutines in the CoQueue and leaves the queue empty.
+ */
+void qemu_co_queue_restart_all(CoQueue *queue);
+
 /**
  * Checks if the CoQueue is empty.
  */
@@ -156,4 +168,44 @@ void coroutine_fn qemu_co_mutex_lock(CoMutex *mutex);
  */
 void coroutine_fn qemu_co_mutex_unlock(CoMutex *mutex);
 
+typedef struct CoRwlock {
+    bool writer;
+    int reader;
+    CoQueue queue;
+} CoRwlock;
+
+/**
+ * Initialises a CoRwlock. This must be called before any other operation
+ * is used on the CoRwlock
+ */
+void qemu_co_rwlock_init(CoRwlock *lock);
+
+/**
+ * Read locks the CoRwlock. If the lock cannot be taken immediately because
+ * of a parallel writer, control is transferred to the caller of the current
+ * coroutine.
+ */
+void qemu_co_rwlock_rdlock(CoRwlock *lock);
+
+/**
+ * Write Locks the mutex. If the lock cannot be taken immediately because
+ * of a parallel reader, control is transferred to the caller of the current
+ * coroutine.
+ */
+void qemu_co_rwlock_wrlock(CoRwlock *lock);
+
+/**
+ * Unlocks the read/write lock and schedules the next coroutine that was
+ * waiting for this lock to be run.
+ */
+void qemu_co_rwlock_unlock(CoRwlock *lock);
+
+/**
+ * Yield the coroutine for a given duration
+ *
+ * Note this function uses timers and hence only works when a main loop is in
+ * use.  See main-loop.h and do not use from qemu-tool programs.
+ */
+void coroutine_fn co_sleep_ns(QEMUClock *clock, int64_t ns);
+
 #endif /* QEMU_COROUTINE_H */