Changeset 418d31ac for libcfa/src/bits

Timestamp:

Jan 10, 2022, 7:10:43 PM (3 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, ast-experimental, enum, forall-pointer-decay, master, pthread-emulation, qualifiedEnum

Children:

5b7a3662

Parents:

078fb05

Message:

Added spin count to spin locks as a debugging tool

File:

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

libcfa/src/bits/locks.hfa

@@ -31 +31 @@
                 // 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
 };
@@ -48 +50 @@
         static inline void ?{}( __spinlock_t & this ) {
                 this.lock = 0;
+                #ifdef __CFA_DEBUG__
+                        this.spin_count = 0;
+                #endif
         }
 
@@ -72 +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