Add very preliminary threadpool implementation.

Author: insertinterestingnamehere

include/qt_threadpool.h

@@ -0,0 +1,23 @@
+#ifndef QT_THREADPOOL_H
+#define QT_THREADPOOL_H
+
+#include <stdint.h>
+
+#include <qthread/common.h>
+
+typedef int (*qt_threadpool_func_type)(void *);
+
+typedef enum {
+  POOL_INIT_SUCCESS,
+  POOL_INIT_ALREADY_INITIALIZED,
+  POOL_INIT_NO_THREADS_SPECIFIED,
+  POOL_INIT_OUT_OF_MEMORY,
+  // TODO: better granularity when forwarding errors from thread creation.
+  POOL_INIT_ERROR
+} hw_pool_init_status;
+
+hw_pool_init_status hw_pool_init(uint32_t num_threads);
+void hw_pool_destroy();
+void hw_pool_run_on_all(qt_threadpool_func_type func, void *arg);
+
+#endif

src/CMakeLists.txt

@@ -35,6 +35,7 @@ set(QTHREADS_SOURCES
   alloc/${QTHREADS_ALLOC}.c
   affinity/common.c
   affinity/${QTHREADS_TOPOLOGY}.c
+  threadpool.c
   touch.c
   tls.c
   teams.c