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+/*
+ * 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;
+}