New dmnsn_new_thread() function.

Two advantages: first, waiters are guaranteed to wake if a dmnsn_error()
cancels a thread.  Second, the thread library is fully abstracted over by
threads.{c,h} and progress.{c,h} now, though raytrace.c is still using
pthread_create() directly.

1 files changed, 58 insertions, 0 deletions

diff --git a/libdimension/threads.c b/libdimension/threads.c
new file mode 100644
index 0000000..5450ecc
--- /dev/null
+++ b/libdimension/threads.c
@@ -0,0 +1,58 @@
+/*************************************************************************
+ * Copyright (C) 2010 Tavian Barnes <tavianator@gmail.com>               *
+ *                                                                       *
+ * This file is part of The Dimension Library.                           *
+ *                                                                       *
+ * The Dimension Library is free software; you can redistribute it and/  *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version.                       *
+ *                                                                       *
+ * The Dimension Library is distributed in the hope that it will be      *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty   *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
+ * Lesser General Public License for more details.                       *
+ *                                                                       *
+ * You should have received a copy of the GNU Lesser General Public      *
+ * License along with this program.  If not, see                         *
+ * <http://www.gnu.org/licenses/>.                                       *
+ *************************************************************************/
+
+#include "dimension_impl.h"
+
+typedef struct dmnsn_thread_payload {
+  dmnsn_thread_fn *thread_fn;
+  void *arg;
+  dmnsn_progress *progress;
+} dmnsn_thread_payload;
+
+static void
+dmnsn_thread_cleanup(void *arg)
+{
+  dmnsn_progress *progress = arg;
+  dmnsn_done_progress(progress);
+}
+
+static void *
+dmnsn_thread(void *arg)
+{
+  dmnsn_thread_payload *payload = arg;
+  int *ret;
+  pthread_cleanup_push(&dmnsn_thread_cleanup, payload->progress);
+  ret  = dmnsn_malloc(sizeof(ret));
+  *ret = (*payload->thread_fn)(payload->arg);
+  pthread_cleanup_pop(1);
+  return ret;
+}
+
+int
+dmnsn_new_thread(dmnsn_progress *progress, const pthread_attr_t *attr,
+                 dmnsn_thread_fn *thread_fn, void *arg)
+{
+  dmnsn_thread_payload *payload = dmnsn_malloc(sizeof(dmnsn_thread_payload));
+  payload->thread_fn = thread_fn;
+  payload->arg       = arg;
+  payload->progress  = progress;
+
+  return pthread_create(&progress->thread, attr, &dmnsn_thread, payload);
+}