New design for pthread_once (with cancelability); ABI change

1 files changed, 114 insertions, 0 deletions

diff --git a/tests/once3.c b/tests/once3.c
new file mode 100644
index 0000000..fabed51
--- /dev/null
+++ b/tests/once3.c
@@ -0,0 +1,114 @@
+/*
+ * once3.c
+ *
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.canberra.edu.au
+ * 
+ *      The current list of contributors is contained
+ *      in the file CONTRIBUTORS included with the source
+ *      code distribution. The list can also be seen at the
+ *      following World Wide Web location:
+ *      http://sources.redhat.com/pthreads-win32/contributors.html
+ * 
+ *      This 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 2 of the License, or (at your option) any later version.
+ * 
+ *      This 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 library in the file COPYING.LIB;
+ *      if not, write to the Free Software Foundation, Inc.,
+ *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Create several pthread_once objects and channel several threads
+ * through each. Make the init_routine cancelable and cancel them
+ * waiters waiting.
+ *
+ * Depends on API functions:
+ *	pthread_once()
+ *	pthread_create()
+ *      pthread_testcancel()
+ *      pthread_cancel()
+ *      pthread_once()
+ */
+
+#include "test.h"
+
+#define NUM_THREADS 100 /* Targeting each once control */
+#define NUM_ONCE    10
+
+pthread_once_t o = PTHREAD_ONCE_INIT;
+pthread_once_t once[NUM_ONCE];
+
+static int numOnce = 0;
+static int numThreads = 0;
+
+void
+myfunc(void)
+{
+  numOnce++;
+  /* Simulate slow once routine so that following threads pile up behind it */
+  Sleep(10);
+  /* test for cancelation late so we're sure to have waiters. */
+  pthread_testcancel();
+}
+
+void *
+mythread(void * arg)
+{
+  /*
+   * Cancel every thread. These threads are deferred cancelable only, so
+   * only the thread performing the init_routine will see it (there are
+   * no other cancelation points here). The result will be that every thread
+   * eventually cancels only when it becomes the new initter.
+   */
+  pthread_cancel(pthread_self());
+  assert(pthread_once(&once[(int) arg], myfunc) == 0);
+  numThreads++;
+  return 0;
+}
+
+int
+main()
+{
+  pthread_t t[NUM_THREADS][NUM_ONCE];
+  int i, j;
+  
+  for (j = 0; j < NUM_ONCE; j++)
+    {
+      once[j] = o;
+
+      for (i = 0; i < NUM_THREADS; i++)
+        {
+          assert(pthread_create(&t[i][j], NULL, mythread, (void *) j) == 0);
+        }
+    }
+
+  for (j = 0; j < NUM_ONCE; j++)
+    for (i = 0; i < NUM_THREADS; i++)
+      if (pthread_join(t[i][j], NULL) != 0)
+        printf("Join failed for [thread,once] = [%d,%d]\n", i, j);
+
+  /*
+   * All threads will cancel, none will return normally from
+   * pthread_once and so numThreads should never be incremented. However,
+   * numOnce should be incremented by every thread (NUM_THREADS*NUM_ONCE).
+   */
+  assert(numOnce == NUM_ONCE * NUM_THREADS);
+  assert(numThreads == 0);
+
+  return 0;
+}