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-rw-r--r--condvar_check_need_init.c94
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diff --git a/condvar_check_need_init.c b/condvar_check_need_init.c
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-/*
- * condvar_check_need_init.c
- *
- * Description:
- * This translation unit implements condition variables and their 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"
-
-
-static INLINE int
-ptw32_cond_check_need_init (pthread_cond_t *cond)
-{
- int result = 0;
-
- /*
- * The following guarded test is specifically for statically
- * initialised condition variables (via PTHREAD_OBJECT_INITIALIZER).
- *
- * Note that by not providing this synchronisation we risk
- * introducing race conditions into applications which are
- * correctly written.
- *
- * Approach
- * --------
- * We know that static condition variables will not be PROCESS_SHARED
- * so we can serialise access to internal state using
- * Win32 Critical Sections rather than Win32 Mutexes.
- *
- * If using a single global lock slows applications down too much,
- * multiple global locks could be created and hashed on some random
- * value associated with each mutex, the pointer perhaps. At a guess,
- * a good value for the optimal number of global locks might be
- * the number of processors + 1.
- *
- */
- EnterCriticalSection(&ptw32_cond_test_init_lock);
-
- /*
- * We got here possibly under race
- * conditions. Check again inside the critical section.
- * If a static cv has been destroyed, the application can
- * re-initialise it only by calling pthread_cond_init()
- * explicitly.
- */
- if (*cond == PTHREAD_COND_INITIALIZER)
- {
- result = pthread_cond_init(cond, NULL);
- }
- else if (*cond == NULL)
- {
- /*
- * The cv has been destroyed while we were waiting to
- * initialise it, so the operation that caused the
- * auto-initialisation should fail.
- */
- result = EINVAL;
- }
-
- LeaveCriticalSection(&ptw32_cond_test_init_lock);
-
- return result;
-}