From bbae92ba08f8bc5d4d93d45b3e032686270dc99e Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 25 Apr 2005 00:49:04 +0000
Subject: ''

---
 ptw32_relmillisecs.c | 120 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 ptw32_relmillisecs.c

(limited to 'ptw32_relmillisecs.c')

diff --git a/ptw32_relmillisecs.c b/ptw32_relmillisecs.c
new file mode 100644
index 0000000..2e6bc4d
--- /dev/null
+++ b/ptw32_relmillisecs.c
@@ -0,0 +1,120 @@
+/*
+ * ptw32_relmillisecs.c
+ *
+ * Description:
+ * This translation unit implements miscellaneous thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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
+ */
+
+#ifndef _UWIN
+//#include <process.h>
+#endif
+#include "pthread.h"
+#include "implement.h"
+#ifndef NEED_FTIME
+#include <sys/timeb.h>
+#endif
+
+
+INLINE DWORD 
+ptw32_relmillisecs (const struct timespec * abstime)
+{
+  const int64_t NANOSEC_PER_MILLISEC = 1000000;
+  const int64_t MILLISEC_PER_SEC = 1000;
+  DWORD milliseconds;
+  int64_t tmpAbsMilliseconds;
+  int64_t tmpCurrMilliseconds;
+#ifdef NEED_FTIME
+  struct timespec currSysTime;
+  FILETIME ft;
+  SYSTEMTIME st;
+#else /* ! NEED_FTIME */
+  struct _timeb currSysTime;
+#endif /* NEED_FTIME */
+
+
+  /* 
+   * Calculate timeout as milliseconds from current system time. 
+   */
+
+  /*
+   * subtract current system time from abstime in a way that checks
+   * that abstime is never in the past, or is never equivalent to the
+   * defined INFINITE value (0xFFFFFFFF).
+   *
+   * Assume all integers are unsigned, i.e. cannot test if less than 0.
+   */
+  tmpAbsMilliseconds =  (int64_t)abstime->tv_sec * MILLISEC_PER_SEC;
+  tmpAbsMilliseconds += ((int64_t)abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
+
+  /* get current system time */
+
+#ifdef NEED_FTIME
+
+  GetSystemTime(&st);
+  SystemTimeToFileTime(&st, &ft);
+  /*
+   * GetSystemTimeAsFileTime(&ft); would be faster,
+   * but it does not exist on WinCE
+   */
+
+  ptw32_filetime_to_timespec(&ft, &currSysTime);
+
+  tmpCurrMilliseconds = (int64_t)currSysTime.tv_sec * MILLISEC_PER_SEC;
+  tmpCurrMilliseconds += ((int64_t)currSysTime.tv_nsec + (NANOSEC_PER_MILLISEC/2))
+			   / NANOSEC_PER_MILLISEC;
+
+#else /* ! NEED_FTIME */
+
+  _ftime(&currSysTime);
+
+  tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
+  tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
+
+#endif /* NEED_FTIME */
+
+  if (tmpAbsMilliseconds > tmpCurrMilliseconds)
+    {
+      milliseconds = (DWORD) (tmpAbsMilliseconds - tmpCurrMilliseconds);
+      if (milliseconds == INFINITE)
+        {
+          /* Timeouts must be finite */
+          milliseconds--;
+        }
+    }
+  else
+    {
+      /* The abstime given is in the past */
+      milliseconds = 0;
+    }
+
+  return milliseconds;
+}
-- 
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