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authorrpj <rpj>2005-04-25 14:42:37 +0000
committerrpj <rpj>2005-04-25 14:42:37 +0000
commit3ef98898333255b8000e9ab4801652c42fd5aacc (patch)
tree58fbe722c2011a392ffb47ad56b97fe44e2fe59c /ptw32_semwait.c
parent75a3015fd7412637a02b1b016b367f5deadfde94 (diff)
''
Diffstat (limited to 'ptw32_semwait.c')
-rw-r--r--ptw32_semwait.c236
1 files changed, 118 insertions, 118 deletions
diff --git a/ptw32_semwait.c b/ptw32_semwait.c
index 209c8a6..8b23d11 100644
--- a/ptw32_semwait.c
+++ b/ptw32_semwait.c
@@ -1,118 +1,118 @@
-/*
- * ptw32_semwait.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
-#include "pthread.h"
-#include "implement.h"
-
-
-int
-ptw32_semwait (sem_t * sem)
- /*
- * ------------------------------------------------------
- * DESCRIPTION
- * This function waits on a POSIX semaphore. If the
- * semaphore value is greater than zero, it decreases
- * its value by one. If the semaphore value is zero, then
- * the calling thread (or process) is blocked until it can
- * successfully decrease the value.
- *
- * Unlike sem_wait(), this routine is non-cancelable.
- *
- * RESULTS
- * 0 successfully decreased semaphore,
- * -1 failed, error in errno.
- * ERRNO
- * EINVAL 'sem' is not a valid semaphore,
- * ENOSYS semaphores are not supported,
- * EINTR the function was interrupted by a signal,
- * EDEADLK a deadlock condition was detected.
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
- sem_t s = *sem;
-
- if (s == NULL)
- {
- result = EINVAL;
- }
- else
- {
- if ((result = pthread_mutex_lock (&s->lock)) == 0)
- {
- int v = --s->value;
-
- (void) pthread_mutex_unlock (&s->lock);
-
- if (v < 0)
- {
- /* Must wait */
- if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0)
- {
-#ifdef NEED_SEM
- if (pthread_mutex_lock (&s->lock) == 0)
- {
- if (s->leftToUnblock > 0)
- {
- --s->leftToUnblock;
- SetEvent(s->sem);
- }
- (void) pthread_mutex_unlock (&s->lock);
- }
-#endif
- return 0;
- }
- }
- else
- {
- return 0;
- }
- }
- }
-
- if (result != 0)
- {
- errno = result;
- return -1;
- }
-
- return 0;
-
-} /* ptw32_semwait */
+/*
+ * ptw32_semwait.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
+#include "pthread.h"
+#include "implement.h"
+
+
+int
+ptw32_semwait (sem_t * sem)
+ /*
+ * ------------------------------------------------------
+ * DESCRIPTION
+ * This function waits on a POSIX semaphore. If the
+ * semaphore value is greater than zero, it decreases
+ * its value by one. If the semaphore value is zero, then
+ * the calling thread (or process) is blocked until it can
+ * successfully decrease the value.
+ *
+ * Unlike sem_wait(), this routine is non-cancelable.
+ *
+ * RESULTS
+ * 0 successfully decreased semaphore,
+ * -1 failed, error in errno.
+ * ERRNO
+ * EINVAL 'sem' is not a valid semaphore,
+ * ENOSYS semaphores are not supported,
+ * EINTR the function was interrupted by a signal,
+ * EDEADLK a deadlock condition was detected.
+ *
+ * ------------------------------------------------------
+ */
+{
+ int result = 0;
+ sem_t s = *sem;
+
+ if (s == NULL)
+ {
+ result = EINVAL;
+ }
+ else
+ {
+ if ((result = pthread_mutex_lock (&s->lock)) == 0)
+ {
+ int v = --s->value;
+
+ (void) pthread_mutex_unlock (&s->lock);
+
+ if (v < 0)
+ {
+ /* Must wait */
+ if (WaitForSingleObject (s->sem, INFINITE) == WAIT_OBJECT_0)
+ {
+#ifdef NEED_SEM
+ if (pthread_mutex_lock (&s->lock) == 0)
+ {
+ if (s->leftToUnblock > 0)
+ {
+ --s->leftToUnblock;
+ SetEvent(s->sem);
+ }
+ (void) pthread_mutex_unlock (&s->lock);
+ }
+#endif
+ return 0;
+ }
+ }
+ else
+ {
+ return 0;
+ }
+ }
+ }
+
+ if (result != 0)
+ {
+ errno = result;
+ return -1;
+ }
+
+ return 0;
+
+} /* ptw32_semwait */