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-rw-r--r--pthread_mutex_timedlock.c461
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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