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authormarha <marha@users.sourceforge.net>2011-07-18 10:33:05 +0200
committermarha <marha@users.sourceforge.net>2011-07-18 10:33:05 +0200
commit88101146f2ec7d53ffb793e365f05097ffd35fd3 (patch)
treedb77eef572a00c62c8d9485c4786f682e20a2fd0 /pthreads/pthread_mutex_lock.c
parent772373ccc8da2b2019555228f4972cc0c5a885a4 (diff)
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cvs version of pthreads
Diffstat (limited to 'pthreads/pthread_mutex_lock.c')
-rw-r--r--pthreads/pthread_mutex_lock.c408
1 files changed, 269 insertions, 139 deletions
diff --git a/pthreads/pthread_mutex_lock.c b/pthreads/pthread_mutex_lock.c
index f15cf6ab0..eee9abe8c 100644
--- a/pthreads/pthread_mutex_lock.c
+++ b/pthreads/pthread_mutex_lock.c
@@ -1,139 +1,269 @@
-/*
- * pthread_mutex_lock.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
-pthread_mutex_lock (pthread_mutex_t * mutex)
-{
- int result = 0;
- pthread_mutex_t mx;
-
- /*
- * Let the system deal with invalid pointers.
- */
- if (*mutex == NULL)
- {
- return EINVAL;
- }
-
- /*
- * 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 (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
- {
- result = EINVAL;
- break;
- }
- }
- }
- }
- 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
- {
- result = EDEADLK;
- }
- }
- else
- {
- while ((LONG) PTW32_INTERLOCKED_EXCHANGE(
- (LPLONG) &mx->lock_idx,
- (LONG) -1) != 0)
- {
- if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
- {
- result = EINVAL;
- break;
- }
- }
-
- if (0 == result)
- {
- mx->recursive_count = 1;
- mx->ownerThread = self;
- }
- }
- }
- }
-
- return (result);
-}
+/*
+ * pthread_mutex_lock.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
+ */
+
+#if !defined(_UWIN)
+/*# include <process.h> */
+#endif
+#include "pthread.h"
+#include "implement.h"
+
+int
+pthread_mutex_lock (pthread_mutex_t * mutex)
+{
+ int kind;
+ pthread_mutex_t mx;
+ int result = 0;
+
+ /*
+ * Let the system deal with invalid pointers.
+ */
+ if (*mutex == NULL)
+ {
+ return EINVAL;
+ }
+
+ /*
+ * 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;
+ kind = mx->kind;
+
+ if (kind >= 0)
+ {
+ /* Non-robust */
+ if (PTHREAD_MUTEX_NORMAL == kind)
+ {
+ if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) 1) != 0)
+ {
+ while ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) -1) != 0)
+ {
+ if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
+ {
+ result = EINVAL;
+ break;
+ }
+ }
+ }
+ }
+ else
+ {
+ pthread_t self = pthread_self();
+
+ if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &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 (kind == PTHREAD_MUTEX_RECURSIVE)
+ {
+ mx->recursive_count++;
+ }
+ else
+ {
+ result = EDEADLK;
+ }
+ }
+ else
+ {
+ while ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) -1) != 0)
+ {
+ if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
+ {
+ result = EINVAL;
+ break;
+ }
+ }
+
+ if (0 == result)
+ {
+ mx->recursive_count = 1;
+ mx->ownerThread = self;
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ /*
+ * Robust types
+ * All types record the current owner thread.
+ * The mutex is added to a per thread list when ownership is acquired.
+ */
+ ptw32_robust_state_t* statePtr = &mx->robustNode->stateInconsistent;
+
+ if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE == PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
+ (PTW32_INTERLOCKED_LONGPTR)statePtr,
+ (PTW32_INTERLOCKED_LONG)0))
+ {
+ result = ENOTRECOVERABLE;
+ }
+ else
+ {
+ pthread_t self = pthread_self();
+
+ kind = -kind - 1; /* Convert to non-robust range */
+
+ if (PTHREAD_MUTEX_NORMAL == kind)
+ {
+ if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) 1) != 0)
+ {
+ while (0 == (result = ptw32_robust_mutex_inherit(mutex))
+ && (PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) -1) != 0)
+ {
+ if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
+ {
+ result = EINVAL;
+ break;
+ }
+ if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE ==
+ PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
+ (PTW32_INTERLOCKED_LONGPTR)statePtr,
+ (PTW32_INTERLOCKED_LONG)0))
+ {
+ /* Unblock the next thread */
+ SetEvent(mx->event);
+ result = ENOTRECOVERABLE;
+ break;
+ }
+ }
+ }
+ if (0 == result || EOWNERDEAD == result)
+ {
+ /*
+ * Add mutex to the per-thread robust mutex currently-held list.
+ * If the thread terminates, all mutexes in this list will be unlocked.
+ */
+ ptw32_robust_mutex_add(mutex, self);
+ }
+ }
+ else
+ {
+ if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) 1,
+ (PTW32_INTERLOCKED_LONG) 0) == 0)
+ {
+ mx->recursive_count = 1;
+ /*
+ * Add mutex to the per-thread robust mutex currently-held list.
+ * If the thread terminates, all mutexes in this list will be unlocked.
+ */
+ ptw32_robust_mutex_add(mutex, self);
+ }
+ else
+ {
+ if (pthread_equal (mx->ownerThread, self))
+ {
+ if (PTHREAD_MUTEX_RECURSIVE == kind)
+ {
+ mx->recursive_count++;
+ }
+ else
+ {
+ result = EDEADLK;
+ }
+ }
+ else
+ {
+ while (0 == (result = ptw32_robust_mutex_inherit(mutex))
+ && (PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
+ (PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
+ (PTW32_INTERLOCKED_LONG) -1) != 0)
+ {
+ if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
+ {
+ result = EINVAL;
+ break;
+ }
+ if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE ==
+ PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
+ (PTW32_INTERLOCKED_LONGPTR)statePtr,
+ (PTW32_INTERLOCKED_LONG)0))
+ {
+ /* Unblock the next thread */
+ SetEvent(mx->event);
+ result = ENOTRECOVERABLE;
+ break;
+ }
+ }
+
+ if (0 == result || EOWNERDEAD == result)
+ {
+ mx->recursive_count = 1;
+ /*
+ * Add mutex to the per-thread robust mutex currently-held list.
+ * If the thread terminates, all mutexes in this list will be unlocked.
+ */
+ ptw32_robust_mutex_add(mutex, self);
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return (result);
+}
+