give each thread pool a separate pthread_attr_t structure to configure

src/backend/threadpool.c

@@ -61,6 +61,12 @@ lumiera_threadpool_init(unsigned limit)
       threadpool.pool[i].max_threads = limit;
       threadpool.pool[i].working_thread_count = 0;
       threadpool.pool[i].idle_thread_count = 0;
+
+      //TODO: configure each pools' pthread_attrs appropriately
+      pthread_attr_init (&threadpool.pool[i].pthread_attrs);
+      pthread_attr_setdetachstate (&threadpool.pool[i].pthread_attrs, PTHREAD_CREATE_DETACHED);
+      //cancel...
+
       lumiera_mutex_init(&threadpool.pool[i].lock,"pool of threads", &NOBUG_FLAG(threadpool));
     }
 }
@@ -79,6 +85,7 @@ lumiera_threadpool_destroy(void)
       ECHO ("destroying the pool mutex");
       lumiera_mutex_destroy (&threadpool.pool[i].lock, &NOBUG_FLAG (threadpool));
       ECHO ("pool mutex destroyed");
+      pthread_attr_destroy (&threadpool.pool[i].pthread_attrs);
     }
 }
 
@@ -97,7 +104,8 @@ lumiera_threadpool_acquire_thread(enum lumiera_thread_class kind,
       if (threadpool.pool[kind].working_thread_count
           + threadpool.pool[kind].idle_thread_count
           < threadpool.pool[kind].max_threads) {
-        ret = lumiera_thread_new (kind, NULL, purpose, flag);
+        ret = lumiera_thread_new (kind, NULL, purpose, flag,
+                                  &threadpool.pool[kind].pthread_attrs);
         threadpool.pool[kind].working_thread_count++;
         ENSURE (ret, "did not create a valid thread");
       }

src/backend/threadpool.h

@@ -74,6 +74,7 @@ struct lumiera_threadpool_struct
     unsigned max_threads;
     unsigned working_thread_count;
     unsigned idle_thread_count;
+    pthread_attr_t pthread_attrs;
   } pool[LUMIERA_THREADCLASS_COUNT];
 };
 

src/backend/threads.c

@@ -93,16 +93,6 @@ static void* pthread_runner (void* thread)
 }
 #endif
 
-static pthread_once_t attr_once = PTHREAD_ONCE_INIT;
-static pthread_attr_t attrs;
-
-static void thread_attr_init (void)
-{
-  pthread_attr_init (&attrs);
-  pthread_attr_setdetachstate (&attrs, PTHREAD_CREATE_DETACHED);
-  //cancel ...
-}
-
 #if 0
 // TODO: rewrite this using lumiera_threadpool_acquire()
 LumieraThread
@@ -171,27 +161,26 @@ LumieraThread
 lumiera_thread_new (enum lumiera_thread_class kind,
                     LumieraReccondition finished,
                     const char* purpose,
-                    struct nobug_flag* flag)
+                    struct nobug_flag* flag,
+                    pthread_attr_t* attrs)
 {
   // TODO: do something with these:
   (void) purpose;
   (void) flag;
   REQUIRE (kind < LUMIERA_THREADCLASS_COUNT, "invalid thread kind specified: %d", kind);
-
-  if (attr_once == PTHREAD_ONCE_INIT)
-    pthread_once (&attr_once, thread_attr_init);
+  REQUIRE (attrs, "invalid pthread attributes structure passed");
 
   //REQUIRE (finished, "invalid finished flag passed");
 
+
   LumieraThread self = lumiera_malloc (sizeof (*self));
   llist_init(&self->node);
   self->finished = finished;
   self->kind = kind;
   self->state = LUMIERA_THREADSTATE_IDLE;
 
-  //REQUIRE (&attrs);
-  //REQUIRE (&thread_loop);
-  int error = pthread_create (&self->id, &attrs, &thread_loop, self);
+  //REQUIRE (thread_loop);
+  int error = pthread_create (&self->id, attrs, &thread_loop, self);
   ENSURE(error == 0 || EAGAIN == error, "pthread returned %d:%s", error, strerror(error));
   if (error)
     {

src/backend/threads.h

@@ -139,7 +139,8 @@ LumieraThread
 lumiera_thread_new (enum lumiera_thread_class kind,
                     LumieraReccondition finished,
                     const char* purpose,
-                    struct nobug_flag* flag);
+                    struct nobug_flag* flag,
+                    pthread_attr_t* attrs);
 
 LumieraThread
 lumiera_thread_destroy (LumieraThread self);