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authorrpj <rpj>2002-02-18 03:16:52 +0000
committerrpj <rpj>2002-02-18 03:16:52 +0000
commita416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 (patch)
tree72f776cd64e48824a5578ff7a523bc69097143b4 /pthread_delay_np.c
parente6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (diff)
Major reorganisation of source code; new routine and tests added.
Diffstat (limited to 'pthread_delay_np.c')
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1 files changed, 155 insertions, 0 deletions
diff --git a/pthread_delay_np.c b/pthread_delay_np.c
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+/*
+ * pthreads_delay_np.c
+ *
+ * Description:
+ * This translation unit implements non-portable thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * Pthreads-win32 - POSIX Threads Library for Win32
+ * Copyright(C) 1998 John E. Bossom
+ * Copyright(C) 1999,2002 Pthreads-win32 contributors
+ *
+ * Contact Email: rpj@ise.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"
+
+/*
+ * pthread_delay_np
+ *
+ * DESCRIPTION
+ *
+ * This routine causes a thread to delay execution for a specific period of time.
+ * This period ends at the current time plus the specified interval. The routine
+ * will not return before the end of the period is reached, but may return an
+ * arbitrary amount of time after the period has gone by. This can be due to
+ * system load, thread priorities, and system timer granularity.
+ *
+ * Specifying an interval of zero (0) seconds and zero (0) nanoseconds is
+ * allowed and can be used to force the thread to give up the processor or to
+ * deliver a pending cancelation request.
+ *
+ * The timespec structure contains the following two fields:
+ *
+ * tv_sec is an integer number of seconds.
+ * tv_nsec is an integer number of nanoseconds.
+ *
+ * Return Values
+ *
+ * If an error condition occurs, this routine returns an integer value indicating
+ * the type of error. Possible return values are as follows:
+ *
+ * 0
+ * Successful completion.
+ * [EINVAL]
+ * The value specified by interval is invalid.
+ *
+ * Example
+ *
+ * The following code segment would wait for 5 and 1/2 seconds
+ *
+ * struct timespec tsWait;
+ * int intRC;
+ *
+ * tsWait.tv_sec = 5;
+ * tsWait.tv_nsec = 500000000L;
+ * intRC = pthread_delay_np(&tsWait);
+ */
+int
+pthread_delay_np (struct timespec * interval)
+{
+ DWORD wait_time;
+ DWORD secs_in_millisecs;
+ DWORD millisecs;
+ DWORD status;
+ pthread_t self;
+
+ if (interval == NULL)
+ {
+ return EINVAL;
+ }
+
+ if (interval->tv_sec == 0L && interval->tv_nsec == 0L)
+ {
+ pthread_testcancel();
+ Sleep(0);
+ pthread_testcancel();
+ return (0);
+ }
+
+ /* convert secs to millisecs */
+ secs_in_millisecs = interval->tv_sec * 1000L;
+
+ /* convert nanosecs to millisecs (rounding up) */
+ millisecs = (interval->tv_nsec + 999999L) / 1000000L;
+
+ if (0 > (wait_time = secs_in_millisecs + millisecs))
+ {
+ return EINVAL;
+ }
+
+ if (NULL == (self = pthread_self()))
+ {
+ return ENOMEM;
+ }
+
+ if (self->cancelState == PTHREAD_CANCEL_ENABLE)
+ {
+ /*
+ * Async cancelation won't catch us until wait_time is up.
+ * Deferred cancelation will cancel us immediately.
+ */
+ if (WAIT_OBJECT_0 ==
+ (status = WaitForSingleObject(self->cancelEvent, wait_time)) )
+ {
+ /*
+ * Canceling!
+ */
+ (void) pthread_mutex_lock(&self->cancelLock);
+ if (self->state < PThreadStateCanceling)
+ {
+ self->state = PThreadStateCanceling;
+ self->cancelState = PTHREAD_CANCEL_DISABLE;
+ (void) pthread_mutex_unlock(&self->cancelLock);
+
+ ptw32_throw(PTW32_EPS_CANCEL);
+ }
+
+ (void) pthread_mutex_unlock(&self->cancelLock);
+ return ESRCH;
+ }
+ else if (status != WAIT_TIMEOUT)
+ {
+ return EINVAL;
+ }
+ }
+ else
+ {
+ Sleep( wait_time );
+ }
+
+ return (0);
+}