diff options
Diffstat (limited to 'sem_getvalue.c')
| -rw-r--r-- | sem_getvalue.c | 213 |
1 files changed, 101 insertions, 112 deletions
diff --git a/sem_getvalue.c b/sem_getvalue.c index 693ed57..f1a7e4b 100644 --- a/sem_getvalue.c +++ b/sem_getvalue.c @@ -1,112 +1,101 @@ -/* - * ------------------------------------------------------------- - * - * Module: sem_getvalue.c - * - * Purpose: - * Semaphores aren't actually part of PThreads. - * They are defined by the POSIX Standard: - * - * POSIX 1003.1-2001 - * - * ------------------------------------------------------------- - * - * -------------------------------------------------------------------------- - * - * 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 "semaphore.h" -#include "implement.h" - - -int -sem_getvalue (sem_t * sem, int *sval) - /* - * ------------------------------------------------------ - * DOCPUBLIC - * This function stores the current count value of the - * semaphore. - * RESULTS - * - * Return value - * - * 0 sval has been set. - * -1 failed, error in errno - * - * in global errno - * - * EINVAL 'sem' is not a valid semaphore, - * ENOSYS this function is not supported, - * - * - * PARAMETERS - * - * sem pointer to an instance of sem_t - * - * sval pointer to int. - * - * DESCRIPTION - * This function stores the current count value of the semaphore - * pointed to by sem in the int pointed to by sval. - */ -{ - if (sem == NULL || *sem == NULL || sval == NULL) - { - errno = EINVAL; - return -1; - } - else - { - long value; - register sem_t s = *sem; - int result = 0; - -#ifdef NEED_SEM - - EnterCriticalSection (&s->sem_lock_cs); - value = s->value; - LeaveCriticalSection (&s->sem_lock_cs); - *sval = value; - -#else - - if ((result = pthread_mutex_lock(&s->lock)) == 0) - { - value = s->value; - (void) pthread_mutex_unlock(&s->lock); - *sval = value; - } - -#endif - - return result; - } - -} /* sem_getvalue */ +/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_getvalue.c
+ *
+ * Purpose:
+ * Semaphores aren't actually part of PThreads.
+ * They are defined by the POSIX Standard:
+ *
+ * POSIX 1003.1-2001
+ *
+ * -------------------------------------------------------------
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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 "semaphore.h"
+#include "implement.h"
+
+
+int
+sem_getvalue (sem_t * sem, int *sval)
+ /*
+ * ------------------------------------------------------
+ * DOCPUBLIC
+ * This function stores the current count value of the
+ * semaphore.
+ * RESULTS
+ *
+ * Return value
+ *
+ * 0 sval has been set.
+ * -1 failed, error in errno
+ *
+ * in global errno
+ *
+ * EINVAL 'sem' is not a valid semaphore,
+ * ENOSYS this function is not supported,
+ *
+ *
+ * PARAMETERS
+ *
+ * sem pointer to an instance of sem_t
+ *
+ * sval pointer to int.
+ *
+ * DESCRIPTION
+ * This function stores the current count value of the semaphore
+ * pointed to by sem in the int pointed to by sval.
+ */
+{
+ if (sem == NULL || *sem == NULL || sval == NULL)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+ else
+ {
+ long value;
+ register sem_t s = *sem;
+ int result = 0;
+
+ if ((result = pthread_mutex_lock(&s->lock)) == 0)
+ {
+ value = s->value;
+ (void) pthread_mutex_unlock(&s->lock);
+ *sval = value;
+ }
+
+ return result;
+ }
+
+} /* sem_getvalue */
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