Changeset 418d31ac


Ignore:
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:
1 edited

Legend:

Unmodified
Added
Removed
  • libcfa/src/bits/locks.hfa

    r078fb05 r418d31ac  
    3131                // previous thread to acquire the lock
    3232                void* prev_thrd;
     33                // keep track of number of times we had to spin, just in case the number is unexpectedly huge
     34                size_t spin_count;
    3335        #endif
    3436};
     
    4850        static inline void ?{}( __spinlock_t & this ) {
    4951                this.lock = 0;
     52                #ifdef __CFA_DEBUG__
     53                        this.spin_count = 0;
     54                #endif
    5055        }
    5156
     
    7277                for ( unsigned int i = 1;; i += 1 ) {
    7378                        if ( (this.lock == 0) && (__atomic_test_and_set( &this.lock, __ATOMIC_ACQUIRE ) == 0) ) break;
     79                        #ifdef __CFA_DEBUG__
     80                                this.spin_count++;
     81                        #endif
    7482                        #ifndef NOEXPBACK
    7583                                // exponential spin
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