Changes in libcfa/src/bits/locks.hfa [ced5e2a:418d31ac]

File:

• libcfa/src/bits/locks.hfa (modified) (3 diffs)

libcfa/src/bits/locks.hfa

@@ -26 +26 @@
         // Wrap in struct to prevent false sharing with debug info
         volatile bool lock;
+        #ifdef __CFA_DEBUG__
+                // previous function to acquire the lock
+                const char * prev_name;
+                // previous thread to acquire the lock
+                void* prev_thrd;
+                // keep track of number of times we had to spin, just in case the number is unexpectedly huge
+                size_t spin_count;
+        #endif
 };
 
@@ -32 +40 @@
                 extern void disable_interrupts() OPTIONAL_THREAD;
                 extern void enable_interrupts( bool poll = true ) OPTIONAL_THREAD;
-                #define __cfaabi_dbg_record_lock(x, y)
+
+                #ifdef __CFA_DEBUG__
+                        void __cfaabi_dbg_record_lock(__spinlock_t & this, const char prev_name[]);
+                #else
+                        #define __cfaabi_dbg_record_lock(x, y)
+                #endif
         }
 
         static inline void ?{}( __spinlock_t & this ) {
                 this.lock = 0;
+                #ifdef __CFA_DEBUG__
+                        this.spin_count = 0;
+                #endif
         }
 
@@ -61 +77 @@
                 for ( unsigned int i = 1;; i += 1 ) {
                         if ( (this.lock == 0) && (__atomic_test_and_set( &this.lock, __ATOMIC_ACQUIRE ) == 0) ) break;
+                        #ifdef __CFA_DEBUG__
+                                this.spin_count++;
+                        #endif
                         #ifndef NOEXPBACK
                                 // exponential spin