X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?a=blobdiff_plain;f=palacios%2Finclude%2Fpalacios%2Fvmm_lock.h;h=5531aead37c3c4cf06a760320cbf4ca53a7c33d0;hb=626494b00fd477070f7eb43693eb16c4dc45f66b;hp=575bb81da14f0fad58de87e2b3ae7c00b7d269e8;hpb=2dd1cacbcfe8c0c9acc1d04098e0e2e65a505202;p=palacios.git

diff --git a/palacios/include/palacios/vmm_lock.h b/palacios/include/palacios/vmm_lock.h
index 575bb81..5531aea 100644
--- a/palacios/include/palacios/vmm_lock.h
+++ b/palacios/include/palacios/vmm_lock.h
@@ -23,20 +23,50 @@
 #ifdef __V3VEE__
 #include <palacios/vmm_types.h>
 
+// Exclusive locks
+
 typedef addr_t v3_lock_t;
 
 int v3_lock_init(v3_lock_t * lock);
 void v3_lock_deinit(v3_lock_t * lock);
 
 
+// Interreupts unaffected
 void v3_lock(v3_lock_t lock);
 void v3_unlock(v3_lock_t lock);
 
-
+// Interrupts disabled
 addr_t v3_lock_irqsave(v3_lock_t lock);
 void v3_unlock_irqrestore(v3_lock_t lock, addr_t irq_state);
 
 
+// Reader-writer locks
+
+typedef struct v3_rw_lock {
+    v3_lock_t lock;
+    sint64_t  reader_count;
+} v3_rw_lock_t;
+
+int v3_rw_lock_init(v3_rw_lock_t *lock);
+void v3_rw_lock_deinit(v3_rw_lock_t *lock);
+
+// A read lock is not exclusive and does not
+// affect interrupts
+void v3_read_lock(v3_rw_lock_t *lock);
+void v3_read_unlock(v3_rw_lock_t *lock);
+
+// A write lock is exclusive and may affect
+// interrupts
+
+// leaves interrupt state alone
+void v3_write_lock(v3_rw_lock_t *lock);
+void v3_read_unlock(v3_rw_lock_t *lock);
+
+// turn interrupts off
+addr_t v3_write_lock_irqsave(v3_rw_lock_t *lock);
+void v3_write_unlock_irqrestore(v3_rw_lock_t *lock, addr_t irq_state);
+
+
 #endif
 
 #endif