added a 'deps' directory and moved w32-pthreads into it

deps/w32-pthreads/sem_wait.c

@@ -0,0 +1,187 @@
+/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_wait.c
+ *
+ * Purpose:
+ *	Semaphores aren't actually part of the PThreads standard.
+ *	They are defined by the POSIX Standard:
+ *
+ *		POSIX 1003.1b-1993	(POSIX.1b)
+ *
+ * -------------------------------------------------------------
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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
+ */
+
+#include "pthread.h"
+#include "semaphore.h"
+#include "implement.h"
+
+
+static void PTW32_CDECL
+ptw32_sem_wait_cleanup(void * sem)
+{
+  sem_t s = (sem_t) sem;
+
+  if (pthread_mutex_lock (&s->lock) == 0)
+    {
+      /*
+       * If sema is destroyed do nothing, otherwise:-
+       * If the sema is posted between us being cancelled and us locking
+       * the sema again above then we need to consume that post but cancel
+       * anyway. If we don't get the semaphore we indicate that we're no
+       * longer waiting.
+       */
+      if (*((sem_t *)sem) != NULL && !(WaitForSingleObject(s->sem, 0) == WAIT_OBJECT_0))
+	{
+	  ++s->value;
+#if defined(NEED_SEM)
+	  if (s->value > 0)
+	    {
+	      s->leftToUnblock = 0;
+	    }
+#else
+	  /*
+	   * Don't release the W32 sema, it doesn't need adjustment
+	   * because it doesn't record the number of waiters.
+	   */
+#endif /* NEED_SEM */
+	}
+      (void) pthread_mutex_unlock (&s->lock);
+    }
+}
+
+int
+sem_wait (sem_t * sem)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function  waits on a semaphore.
+      *
+      * PARAMETERS
+      *      sem
+      *              pointer to an instance of sem_t
+      *
+      * DESCRIPTION
+      *      This function waits on a semaphore. If the
+      *      semaphore value is greater than zero, it decreases
+      *      its value by one. If the semaphore value is zero, then
+      *      the calling thread (or process) is blocked until it can
+      *      successfully decrease the value or until interrupted by
+      *      a signal.
+      *
+      * RESULTS
+      *              0               successfully decreased semaphore,
+      *              -1              failed, error in errno
+      * ERRNO
+      *              EINVAL          'sem' is not a valid semaphore,
+      *              ENOSYS          semaphores are not supported,
+      *              EINTR           the function was interrupted by a signal,
+      *              EDEADLK         a deadlock condition was detected.
+      *
+      * ------------------------------------------------------
+      */
+{
+  int result = 0;
+  sem_t s = *sem;
+
+  pthread_testcancel();
+
+  if (s == NULL)
+    {
+      result = EINVAL;
+    }
+  else
+    {
+      if ((result = pthread_mutex_lock (&s->lock)) == 0)
+	{
+	  int v;
+
+	  /* See sem_destroy.c
+	   */
+	  if (*sem == NULL)
+	    {
+	      (void) pthread_mutex_unlock (&s->lock);
+	      errno = EINVAL;
+	      return -1;
+	    }
+
+          v = --s->value;
+	  (void) pthread_mutex_unlock (&s->lock);
+
+	  if (v < 0)
+	    {
+#if defined(_MSC_VER) && _MSC_VER < 1400
+#pragma inline_depth(0)
+#endif
+	      /* Must wait */
+	      pthread_cleanup_push(ptw32_sem_wait_cleanup, (void *) s);
+	      result = pthreadCancelableWait (s->sem);
+	      /* Cleanup if we're canceled or on any other error */
+	      pthread_cleanup_pop(result);
+#if defined(_MSC_VER) && _MSC_VER < 1400
+#pragma inline_depth()
+#endif
+	    }
+#if defined(NEED_SEM)
+
+	  if (!result && pthread_mutex_lock (&s->lock) == 0)
+	    {
+	      if (*sem == NULL)
+	        {
+	          (void) pthread_mutex_unlock (&s->lock);
+	          errno = EINVAL;
+	          return -1;
+	        }
+
+	      if (s->leftToUnblock > 0)
+		{
+		  --s->leftToUnblock;
+		  SetEvent(s->sem);
+		}
+	      (void) pthread_mutex_unlock (&s->lock);
+	    }
+
+#endif /* NEED_SEM */
+
+	}
+
+    }
+
+  if (result != 0)
+    {
+      errno = result;
+      return -1;
+    }
+
+  return 0;
+
+}				/* sem_wait */