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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 /ptw32_spinlock_check_need_init.c
parente6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (diff)
Major reorganisation of source code; new routine and tests added.
Diffstat (limited to 'ptw32_spinlock_check_need_init.c')
-rw-r--r--ptw32_spinlock_check_need_init.c81
1 files changed, 81 insertions, 0 deletions
diff --git a/ptw32_spinlock_check_need_init.c b/ptw32_spinlock_check_need_init.c
new file mode 100644
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+++ b/ptw32_spinlock_check_need_init.c
@@ -0,0 +1,81 @@
+/*
+ * ptw32_spinlock_check_need_init.c
+ *
+ * Description:
+ * This translation unit implements spin lock primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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"
+
+
+INLINE int
+ptw32_spinlock_check_need_init(pthread_spinlock_t *lock)
+{
+ int result = 0;
+
+ /*
+ * The following guarded test is specifically for statically
+ * initialised spinlocks (via PTHREAD_SPINLOCK_INITIALIZER).
+ *
+ * Note that by not providing this synchronisation we risk
+ * introducing race conditions into applications which are
+ * correctly written.
+ */
+ EnterCriticalSection(&ptw32_spinlock_test_init_lock);
+
+ /*
+ * We got here possibly under race
+ * conditions. Check again inside the critical section
+ * and only initialise if the spinlock is valid (not been destroyed).
+ * If a static spinlock has been destroyed, the application can
+ * re-initialise it only by calling pthread_spin_init()
+ * explicitly.
+ */
+ if (*lock == PTHREAD_SPINLOCK_INITIALIZER)
+ {
+ result = pthread_spin_init(lock, PTHREAD_PROCESS_PRIVATE);
+ }
+ else if (*lock == NULL)
+ {
+ /*
+ * The spinlock has been destroyed while we were waiting to
+ * initialise it, so the operation that caused the
+ * auto-initialisation should fail.
+ */
+ result = EINVAL;
+ }
+
+ LeaveCriticalSection(&ptw32_spinlock_test_init_lock);
+
+ return(result);
+}