Merge pull request #5516 from OpenMathLib/revert-4741-Pthread_Scalability_Improvement

Revert "Enhancing Core Utilization in BLAS Calls: A Scalable Architecture"

Author: martin-frbg

driver/level3/level3_thread.c

@@ -588,8 +588,6 @@ static int gemm_driver(blas_arg_t *args, BLASLONG *range_m, BLASLONG
   InitializeCriticalSection((PCRITICAL_SECTION)&level3_lock);
 #else
   static pthread_mutex_t  level3_lock    = PTHREAD_MUTEX_INITIALIZER;
-  static pthread_cond_t  level3_wakeup    = PTHREAD_COND_INITIALIZER;
-  volatile static BLASLONG CPU_AVAILABLE = MAX_CPU_NUMBER;
 #endif
 
   blas_arg_t newarg;
@@ -659,12 +657,6 @@ static int gemm_driver(blas_arg_t *args, BLASLONG *range_m, BLASLONG
   EnterCriticalSection((PCRITICAL_SECTION)&level3_lock);
 #else
   pthread_mutex_lock(&level3_lock);
-  while(CPU_AVAILABLE < nthreads) { 
-    pthread_cond_wait(&level3_wakeup, &level3_lock);
-  } 
-  CPU_AVAILABLE -= nthreads;
-  WMB;
-  pthread_mutex_unlock(&level3_lock);
 #endif
 
 #ifdef USE_ALLOC_HEAP
@@ -816,10 +808,6 @@ static int gemm_driver(blas_arg_t *args, BLASLONG *range_m, BLASLONG
 #elif defined(OS_WINDOWS)
   LeaveCriticalSection((PCRITICAL_SECTION)&level3_lock);
 #else
-  pthread_mutex_lock(&level3_lock);
-  CPU_AVAILABLE += nthreads;
-  WMB;
-  pthread_cond_signal(&level3_wakeup);
   pthread_mutex_unlock(&level3_lock);
 #endif