openblas-libs/patches/0001-backout-PR-4741.patch at a15d431d2821d935acff456bb7e5cfe85004fb46 · MacPython/openblas-libs · GitHub

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From fe2f02876134dcfdd75860c622226b6913eef93e Mon Sep 17 00:00:00 2001
From: mattip <matti.picus@gmail.com>
Date: Wed, 22 Oct 2025 14:40:01 +0300
Subject: [PATCH] backout PR 4741

---
 driver/level3/level3_thread.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/driver/level3/level3_thread.c b/driver/level3/level3_thread.c
index 22f27975b..0832db58b 100644
--- a/driver/level3/level3_thread.c
+++ b/driver/level3/level3_thread.c
@@ -588,8 +588,8 @@ 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;
+  // static pthread_cond_t  level3_wakeup    = PTHREAD_COND_INITIALIZER;
+  // volatile static BLASLONG CPU_AVAILABLE = MAX_CPU_NUMBER;
 #endif

   blas_arg_t newarg;
@@ -659,12 +659,12 @@ 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);
+  // 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 +816,10 @@ 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_lock(&level3_lock);
+  // CPU_AVAILABLE += nthreads;
+  // WMB;
+  // pthread_cond_signal(&level3_wakeup);
   pthread_mutex_unlock(&level3_lock);
 #endif

--
2.43.0