diff options
author | rpj <rpj> | 2005-04-25 00:49:04 +0000 |
---|---|---|
committer | rpj <rpj> | 2005-04-25 00:49:04 +0000 |
commit | bbae92ba08f8bc5d4d93d45b3e032686270dc99e (patch) | |
tree | fa9e02df18385537aaebad48d377a1c21dfa25f3 /pthread_mutex_timedlock.c | |
parent | c2c2749315183f102d8967f37a43394fd39c5abd (diff) |
''
Diffstat (limited to 'pthread_mutex_timedlock.c')
-rw-r--r-- | pthread_mutex_timedlock.c | 461 |
1 files changed, 196 insertions, 265 deletions
diff --git a/pthread_mutex_timedlock.c b/pthread_mutex_timedlock.c index db45f45..ad373ba 100644 --- a/pthread_mutex_timedlock.c +++ b/pthread_mutex_timedlock.c @@ -1,265 +1,196 @@ -/* - * pthread_mutex_timedlock.c - * - * Description: - * This translation unit implements mutual exclusion (mutex) primitives. - * - * -------------------------------------------------------------------------- - * - * 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 -#ifndef NEED_FTIME -#include <sys/timeb.h> -#endif -#include "pthread.h" -#include "implement.h" - - -static INLINE int -ptw32_timed_eventwait (HANDLE event, const struct timespec *abstime) - /* - * ------------------------------------------------------ - * DESCRIPTION - * This function waits on an event until signaled or until - * abstime passes. - * If abstime has passed when this routine is called then - * it returns a result to indicate this. - * - * If 'abstime' is a NULL pointer then this function will - * block until it can successfully decrease the value or - * until interrupted by a signal. - * - * This routine is not a cancelation point. - * - * RESULTS - * 0 successfully signaled, - * ETIMEDOUT abstime passed - * EINVAL 'event' is not a valid event, - * - * ------------------------------------------------------ - */ -{ - -#ifdef NEED_FTIME - - struct timespec currSysTime; - -#else /* NEED_FTIME */ - - struct _timeb currSysTime; - -#endif /* NEED_FTIME */ - - const DWORD NANOSEC_PER_MILLISEC = 1000000; - const DWORD MILLISEC_PER_SEC = 1000; - DWORD milliseconds; - DWORD status; - - if (event == NULL) - { - return EINVAL; - } - else - { - if (abstime == NULL) - { - milliseconds = INFINITE; - } - else - { - /* - * Calculate timeout as milliseconds from current system time. - */ - - /* get current system time */ - -#ifdef NEED_FTIME - - { - FILETIME ft; - SYSTEMTIME st; - - GetSystemTime (&st); - SystemTimeToFileTime (&st, &ft); - /* - * GetSystemTimeAsFileTime(&ft); would be faster, - * but it does not exist on WinCE - */ - - ptw32_filetime_to_timespec (&ft, &currSysTime); - } - - /* - * subtract current system time from abstime - */ - milliseconds = - (abstime->tv_sec - currSysTime.tv_sec) * MILLISEC_PER_SEC; - milliseconds += - ((abstime->tv_nsec - currSysTime.tv_nsec) + - (NANOSEC_PER_MILLISEC / 2)) / NANOSEC_PER_MILLISEC; - -#else /* NEED_FTIME */ - _ftime (&currSysTime); - - /* - * subtract current system time from abstime - */ - milliseconds = - (abstime->tv_sec - currSysTime.time) * MILLISEC_PER_SEC; - milliseconds += - ((abstime->tv_nsec + - (NANOSEC_PER_MILLISEC / 2)) / NANOSEC_PER_MILLISEC) - - currSysTime.millitm; - -#endif /* NEED_FTIME */ - - if (((int) milliseconds) < 0) - { - return ETIMEDOUT; - } - } - - status = WaitForSingleObject (event, milliseconds); - - if (status == WAIT_OBJECT_0) - { - return 0; - } - else if (status == WAIT_TIMEOUT) - { - return ETIMEDOUT; - } - else - { - return EINVAL; - } - } - - return 0; - -} /* ptw32_timed_semwait */ - - -int -pthread_mutex_timedlock (pthread_mutex_t * mutex, - const struct timespec *abstime) -{ - int result; - pthread_mutex_t mx; - -#ifdef NEED_SEM - errno = ENOTSUP; - return -1; -#endif - - /* - * Let the system deal with invalid pointers. - */ - - /* - * We do a quick check to see if we need to do more work - * to initialise a static mutex. We check - * again inside the guarded section of ptw32_mutex_check_need_init() - * to avoid race conditions. - */ - if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER) - { - if ((result = ptw32_mutex_check_need_init (mutex)) != 0) - { - return (result); - } - } - - mx = *mutex; - - if (mx->kind == PTHREAD_MUTEX_NORMAL) - { - if ((LONG) PTW32_INTERLOCKED_EXCHANGE( - (LPLONG) &mx->lock_idx, - (LONG) 1) != 0) - { - while ((LONG) PTW32_INTERLOCKED_EXCHANGE( - (LPLONG) &mx->lock_idx, - (LONG) -1) != 0) - { - if (0 != (result = ptw32_timed_eventwait (mx->event, abstime))) - { - return result; - } - } - } - } - else - { - pthread_t self = pthread_self(); - - if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE( - (PTW32_INTERLOCKED_LPLONG) &mx->lock_idx, - (PTW32_INTERLOCKED_LONG) 1, - (PTW32_INTERLOCKED_LONG) 0) == 0) - { - mx->recursive_count = 1; - mx->ownerThread = self; - } - else - { - if (pthread_equal (mx->ownerThread, self)) - { - if (mx->kind == PTHREAD_MUTEX_RECURSIVE) - { - mx->recursive_count++; - } - else - { - return EDEADLK; - } - } - else - { - while ((LONG) PTW32_INTERLOCKED_EXCHANGE( - (LPLONG) &mx->lock_idx, - (LONG) -1) != 0) - { - if (0 != (result = ptw32_timed_eventwait (mx->event, abstime))) - { - return result; - } - } - - mx->recursive_count = 1; - mx->ownerThread = self; - } - } - } - - return 0; -} +/*
+ * pthread_mutex_timedlock.c
+ *
+ * Description:
+ * This translation unit implements mutual exclusion (mutex) primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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 "implement.h"
+
+
+static INLINE int
+ptw32_timed_eventwait (HANDLE event, const struct timespec *abstime)
+ /*
+ * ------------------------------------------------------
+ * DESCRIPTION
+ * This function waits on an event until signaled or until
+ * abstime passes.
+ * If abstime has passed when this routine is called then
+ * it returns a result to indicate this.
+ *
+ * If 'abstime' is a NULL pointer then this function will
+ * block until it can successfully decrease the value or
+ * until interrupted by a signal.
+ *
+ * This routine is not a cancelation point.
+ *
+ * RESULTS
+ * 0 successfully signaled,
+ * ETIMEDOUT abstime passed
+ * EINVAL 'event' is not a valid event,
+ *
+ * ------------------------------------------------------
+ */
+{
+
+ DWORD milliseconds;
+ DWORD status;
+
+ if (event == NULL)
+ {
+ return EINVAL;
+ }
+ else
+ {
+ if (abstime == NULL)
+ {
+ milliseconds = INFINITE;
+ }
+ else
+ {
+ /*
+ * Calculate timeout as milliseconds from current system time.
+ */
+ milliseconds = ptw32_relmillisecs (abstime);
+ }
+
+ status = WaitForSingleObject (event, milliseconds);
+
+ if (status == WAIT_OBJECT_0)
+ {
+ return 0;
+ }
+ else if (status == WAIT_TIMEOUT)
+ {
+ return ETIMEDOUT;
+ }
+ else
+ {
+ return EINVAL;
+ }
+ }
+
+ return 0;
+
+} /* ptw32_timed_semwait */
+
+
+int
+pthread_mutex_timedlock (pthread_mutex_t * mutex,
+ const struct timespec *abstime)
+{
+ int result;
+ pthread_mutex_t mx;
+
+ /*
+ * Let the system deal with invalid pointers.
+ */
+
+ /*
+ * We do a quick check to see if we need to do more work
+ * to initialise a static mutex. We check
+ * again inside the guarded section of ptw32_mutex_check_need_init()
+ * to avoid race conditions.
+ */
+ if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+ {
+ if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
+ {
+ return (result);
+ }
+ }
+
+ mx = *mutex;
+
+ if (mx->kind == PTHREAD_MUTEX_NORMAL)
+ {
+ if ((LONG) PTW32_INTERLOCKED_EXCHANGE(
+ (LPLONG) &mx->lock_idx,
+ (LONG) 1) != 0)
+ {
+ while ((LONG) PTW32_INTERLOCKED_EXCHANGE(
+ (LPLONG) &mx->lock_idx,
+ (LONG) -1) != 0)
+ {
+ if (0 != (result = ptw32_timed_eventwait (mx->event, abstime)))
+ {
+ return result;
+ }
+ }
+ }
+ }
+ else
+ {
+ pthread_t self = pthread_self();
+
+ if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE(
+ (PTW32_INTERLOCKED_LPLONG) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) 1,
+ (PTW32_INTERLOCKED_LONG) 0) == 0)
+ {
+ mx->recursive_count = 1;
+ mx->ownerThread = self;
+ }
+ else
+ {
+ if (pthread_equal (mx->ownerThread, self))
+ {
+ if (mx->kind == PTHREAD_MUTEX_RECURSIVE)
+ {
+ mx->recursive_count++;
+ }
+ else
+ {
+ return EDEADLK;
+ }
+ }
+ else
+ {
+ while ((LONG) PTW32_INTERLOCKED_EXCHANGE(
+ (LPLONG) &mx->lock_idx,
+ (LONG) -1) != 0)
+ {
+ if (0 != (result = ptw32_timed_eventwait (mx->event, abstime)))
+ {
+ return result;
+ }
+ }
+
+ mx->recursive_count = 1;
+ mx->ownerThread = self;
+ }
+ }
+ }
+
+ return 0;
+}
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