1*062c5bc4SJason Schmidlapp /*
2*062c5bc4SJason Schmidlapp * pte_relmillisecs.c
3*062c5bc4SJason Schmidlapp *
4*062c5bc4SJason Schmidlapp * Description:
5*062c5bc4SJason Schmidlapp * This translation unit implements miscellaneous thread functions.
6*062c5bc4SJason Schmidlapp *
7*062c5bc4SJason Schmidlapp * --------------------------------------------------------------------------
8*062c5bc4SJason Schmidlapp *
9*062c5bc4SJason Schmidlapp * Pthreads-embedded (PTE) - POSIX Threads Library for embedded systems
10*062c5bc4SJason Schmidlapp * Copyright(C) 2008 Jason Schmidlapp
11*062c5bc4SJason Schmidlapp *
12*062c5bc4SJason Schmidlapp * Contact Email: jschmidlapp@users.sourceforge.net
13*062c5bc4SJason Schmidlapp *
14*062c5bc4SJason Schmidlapp *
15*062c5bc4SJason Schmidlapp * Based upon Pthreads-win32 - POSIX Threads Library for Win32
16*062c5bc4SJason Schmidlapp * Copyright(C) 1998 John E. Bossom
17*062c5bc4SJason Schmidlapp * Copyright(C) 1999,2005 Pthreads-win32 contributors
18*062c5bc4SJason Schmidlapp *
19*062c5bc4SJason Schmidlapp * Contact Email: rpj@callisto.canberra.edu.au
20*062c5bc4SJason Schmidlapp *
21*062c5bc4SJason Schmidlapp * The original list of contributors to the Pthreads-win32 project
22*062c5bc4SJason Schmidlapp * is contained in the file CONTRIBUTORS.ptw32 included with the
23*062c5bc4SJason Schmidlapp * source code distribution. The list can also be seen at the
24*062c5bc4SJason Schmidlapp * following World Wide Web location:
25*062c5bc4SJason Schmidlapp * http://sources.redhat.com/pthreads-win32/contributors.html
26*062c5bc4SJason Schmidlapp *
27*062c5bc4SJason Schmidlapp * This library is free software; you can redistribute it and/or
28*062c5bc4SJason Schmidlapp * modify it under the terms of the GNU Lesser General Public
29*062c5bc4SJason Schmidlapp * License as published by the Free Software Foundation; either
30*062c5bc4SJason Schmidlapp * version 2 of the License, or (at your option) any later version.
31*062c5bc4SJason Schmidlapp *
32*062c5bc4SJason Schmidlapp * This library is distributed in the hope that it will be useful,
33*062c5bc4SJason Schmidlapp * but WITHOUT ANY WARRANTY; without even the implied warranty of
34*062c5bc4SJason Schmidlapp * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35*062c5bc4SJason Schmidlapp * Lesser General Public License for more details.
36*062c5bc4SJason Schmidlapp *
37*062c5bc4SJason Schmidlapp * You should have received a copy of the GNU Lesser General Public
38*062c5bc4SJason Schmidlapp * License along with this library in the file COPYING.LIB;
39*062c5bc4SJason Schmidlapp * if not, write to the Free Software Foundation, Inc.,
40*062c5bc4SJason Schmidlapp * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
41*062c5bc4SJason Schmidlapp */
42*062c5bc4SJason Schmidlapp
43*062c5bc4SJason Schmidlapp #include <pte_osal.h>
44*062c5bc4SJason Schmidlapp
45*062c5bc4SJason Schmidlapp #include "pthread.h"
46*062c5bc4SJason Schmidlapp #include "implement.h"
47*062c5bc4SJason Schmidlapp
48*062c5bc4SJason Schmidlapp unsigned int
pte_relmillisecs(const struct timespec * abstime)49*062c5bc4SJason Schmidlapp pte_relmillisecs (const struct timespec * abstime)
50*062c5bc4SJason Schmidlapp {
51*062c5bc4SJason Schmidlapp const long long NANOSEC_PER_MILLISEC = 1000000;
52*062c5bc4SJason Schmidlapp const long long MILLISEC_PER_SEC = 1000;
53*062c5bc4SJason Schmidlapp unsigned int milliseconds;
54*062c5bc4SJason Schmidlapp long long tmpAbsMilliseconds;
55*062c5bc4SJason Schmidlapp long tmpCurrMilliseconds;
56*062c5bc4SJason Schmidlapp struct timeb currSysTime;
57*062c5bc4SJason Schmidlapp
58*062c5bc4SJason Schmidlapp /*
59*062c5bc4SJason Schmidlapp * Calculate timeout as milliseconds from current system time.
60*062c5bc4SJason Schmidlapp */
61*062c5bc4SJason Schmidlapp
62*062c5bc4SJason Schmidlapp /*
63*062c5bc4SJason Schmidlapp * subtract current system time from abstime in a way that checks
64*062c5bc4SJason Schmidlapp * that abstime is never in the past, or is never equivalent to the
65*062c5bc4SJason Schmidlapp * defined INFINITE value (0xFFFFFFFF).
66*062c5bc4SJason Schmidlapp *
67*062c5bc4SJason Schmidlapp * Assume all integers are unsigned, i.e. cannot test if less than 0.
68*062c5bc4SJason Schmidlapp */
69*062c5bc4SJason Schmidlapp tmpAbsMilliseconds = (int64_t)abstime->tv_sec * MILLISEC_PER_SEC;
70*062c5bc4SJason Schmidlapp tmpAbsMilliseconds += ((int64_t)abstime->tv_nsec + (NANOSEC_PER_MILLISEC/2)) / NANOSEC_PER_MILLISEC;
71*062c5bc4SJason Schmidlapp
72*062c5bc4SJason Schmidlapp /* get current system time */
73*062c5bc4SJason Schmidlapp
74*062c5bc4SJason Schmidlapp _ftime(&currSysTime);
75*062c5bc4SJason Schmidlapp
76*062c5bc4SJason Schmidlapp tmpCurrMilliseconds = (int64_t) currSysTime.time * MILLISEC_PER_SEC;
77*062c5bc4SJason Schmidlapp tmpCurrMilliseconds += (int64_t) currSysTime.millitm;
78*062c5bc4SJason Schmidlapp
79*062c5bc4SJason Schmidlapp if (tmpAbsMilliseconds > tmpCurrMilliseconds)
80*062c5bc4SJason Schmidlapp {
81*062c5bc4SJason Schmidlapp milliseconds = (unsigned int) (tmpAbsMilliseconds - tmpCurrMilliseconds);
82*062c5bc4SJason Schmidlapp if (milliseconds == 0xFFFFFFFF)
83*062c5bc4SJason Schmidlapp {
84*062c5bc4SJason Schmidlapp /* Timeouts must be finite */
85*062c5bc4SJason Schmidlapp milliseconds--;
86*062c5bc4SJason Schmidlapp }
87*062c5bc4SJason Schmidlapp }
88*062c5bc4SJason Schmidlapp else
89*062c5bc4SJason Schmidlapp {
90*062c5bc4SJason Schmidlapp /* The abstime given is in the past */
91*062c5bc4SJason Schmidlapp milliseconds = 0;
92*062c5bc4SJason Schmidlapp }
93*062c5bc4SJason Schmidlapp
94*062c5bc4SJason Schmidlapp return milliseconds;
95*062c5bc4SJason Schmidlapp }
96