artifact cache cancellation mutex -> semaphore (fixes cancellation thread on linux - we cannot take/drop across threads with mutexes); flip no_meta -> meta

build.sh

@@ -53,9 +53,9 @@ mkdir -p build
 mkdir -p local
 
 # --- Build & Run Metaprogram -------------------------------------------------
-if [ -v no_meta ]; then echo "[skipping metagen]"; fi
+if [ ! -v meta ]
-if [ ! -v no_meta ]
 then
+  echo "[doing metagen]"
   cd build
   $compile_debug ../src/metagen/metagen_main.c $compile_link $out metagen
   ./metagen

src/artifact_cache/artifact_cache.c

@@ -19,8 +19,7 @@ ac_init(void)
     ac_shared->req_batches[idx].arena = arena_alloc();
   }
   ac_shared->cancel_thread = thread_launch(ac_cancel_thread_entry_point, 0);
-  ac_shared->cancel_thread_mutex = mutex_alloc();
+  ac_shared->cancel_thread_semaphore = semaphore_alloc(0, 1, str8_zero());
-  mutex_take(ac_shared->cancel_thread_mutex);
 }
 
 ////////////////////////////////
@@ -218,7 +217,7 @@ ac_async_tick(void)
   //
   if(lane_idx() == 0)
   {
-    mutex_drop(ac_shared->cancel_thread_mutex);
+    semaphore_drop(ac_shared->cancel_thread_semaphore);
   }
   
   //////////////////////////////
@@ -590,7 +589,7 @@ ac_async_tick(void)
   //
   if(lane_idx() == 0)
   {
-    mutex_take(ac_shared->cancel_thread_mutex);
+    semaphore_take(ac_shared->cancel_thread_semaphore, max_U64);
   }
   scratch_end(scratch);
 }
@@ -604,7 +603,7 @@ ac_cancel_thread_entry_point(void *p)
   for(;;)
   {
     os_sleep_milliseconds(50);
-    MutexScope(ac_shared->cancel_thread_mutex)
+    semaphore_take(ac_shared->cancel_thread_semaphore, max_U64);
     {
       for EachIndex(cache_slot_idx, ac_shared->cache_slots_count)
       {
@@ -650,5 +649,6 @@ ac_cancel_thread_entry_point(void *p)
         }
       }
     }
+    semaphore_drop(ac_shared->cancel_thread_semaphore);
   }
 }

src/artifact_cache/artifact_cache.h

@@ -129,7 +129,7 @@ struct AC_Shared
   
   // rjf: cancel thread
   Thread cancel_thread;
-  Mutex cancel_thread_mutex;
+  Semaphore cancel_thread_semaphore;
 };
 
 ////////////////////////////////

src/base/base_entry_point.c

@@ -57,9 +57,6 @@ main_thread_base_entry_point(int arguments_count, char **arguments)
 #if defined(ARTIFACT_CACHE_H) && !defined(AC_INIT_MANUAL)
   ac_init();
 #endif
-#if defined(ASYNC_H) && !defined(ASYNC_INIT_MANUAL)
-  async_init(&cmdline);
-#endif
 #if defined(CONTENT_H) && !defined(C_INIT_MANUAL)
   c_init();
 #endif

src/os/core/linux/os_core_linux.c

@@ -969,11 +969,7 @@ internal Mutex
 os_mutex_alloc(void)
 {
   OS_LNX_Entity *entity = os_lnx_entity_alloc(OS_LNX_EntityKind_Mutex);
-  pthread_mutexattr_t attr;
+  int init_result = pthread_mutex_init(&entity->mutex_handle, 0);
-  pthread_mutexattr_init(&attr);
-  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
-  int init_result = pthread_mutex_init(&entity->mutex_handle, &attr);
-  pthread_mutexattr_destroy(&attr);
   if(init_result == -1)
   {
     os_lnx_entity_release(entity);